最新刊期
卷 ， 期 S1 ， 2008
- 摘要：The paper introduces the recent 5 year situation and future development of Chinese foundry industry. It includes 5 parts. Part 1 shows general information of Chinese foundry industry, for example, total output change, total enterprise and employee numbers etc, the total castings output of China in 2005 is 24,420,000 tons ,it makes up 28.5% of the global sum.; Part 2 demonstrates different kinds castings output of Chinese foundry industry; Part 3 presents geographic distribution character of Chinese foundry industry, Chinese foundry industry mainly concentrate on 5 regions,that is Liaoning province,Shandong province, the Yangtze River delta, the Pearl River delta and Shanxi province,about half castings output of China comes from the 5 regions ; Part 4 analyses existed problems of Chinese foundry industry ; Part 5 forecasts future development of Chinese foundry industry,in next 10 years,Chinese foundry industry will still grow rapidly.关键词：Chinese foundry industry;Casting;geographic distribution
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发布时间：2023-12-18 - 摘要：金属-气体共晶是由一个液相在凝固过程中同时生成一个固相和一个气相的反应,即Liquid→Solid+Gas。在定向凝固条件下,金属-气体共晶可以形成类似于棒状共晶的组织,即圆柱状气孔定向排列于金属基体中的藕状多孔结构。1993年乌克兰学者Shapovalov博士在美国申请的一项专利中提出了用这种定向凝固金属-气体共晶方法制备藕状多孔金属的新工艺。其后,美国、日本、英国等国纷纷开展了相关的研究。各种常见的金属被用来制备藕状多孔金属。2003年,清华大学的李言祥研究组在教育部博士点基金的资助下开始相关研究,2005年,昆明理工大学周荣教授获得科技部973前期研究专项的资助,两校开始合作研究。几年来,研究取得了积极的进展。本文从①金属-气体共晶定向凝固装备;②金属-气体共晶定向凝固理论;③金属-气体共晶定向凝固藕状多孔材料等几个方面,全面介绍定向凝固金属-气体共晶的研究进展以及我们自己的相关研究成果。关键词：金属-气体共晶;定向凝固;多孔金属;超轻结构材料
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发布时间：2023-12-18 - 摘要：2007年,中国压铸件产量约达119万吨,比上年增长16%;中国市场压铸机销量首次突破4500台,同比增长15%。受锌、铝合金价格波动的影响,近两年冷室机销量增长速度快于热室机。中国压铸行业市场参与者增多、实力迅速增强,2007年压铸企业超过5000家。力劲集团继续独占鳌头并获海外大订单,而外资品牌继续占据细分市场。本文预测汽车轻量化继续带动压铸机市场发展,而锌铝合金压铸机冷热格局可能在中短期内逆转,而镁合金压铸市场前景广阔,中国压铸机出口市场有望形成向上拐点。关键词：压铸机;市场;发展态势;竞争格局;前景
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发布时间：2023-12-18 - 摘要：Rheological processing for clean and perfect castings is a green casting technology to obtain the perfect castings with high precision in dimension and fine quality in microstructure by means of a high pressure and favorable rheologic of the liquid or semisolid alloy melts. One of its advances in the recent years is the model of apparent viscosity based on the energy dissipation in the process. Applications of the technology are not limited to the nonferrous alloy with lower melting point. The uses in ferrous alloys is more and more such as the abrasion-resistant materials, lower alloy steels and high alloy steel. The further targets are to advance the process theory and to enlarge the using fields.
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发布时间：2023-12-18 - 摘要：The excellent thermal conductivity of a copper provides a series of advantages for the copper cooling stave such as small thermal stress, strong ability to produce and hold the slag layer, and to endure the thermal impingement. So it is said that the copper cooling stave is the most satisfied chose for the blast furnace. However, the copper stave is so costly that its actual application is a little for a long time. Using the copper/steel composite material to produce the stave may be a valuable way to solve the problem because of not only the high conductivity and the mechanical properties, but also of the lower price of the copper/steel stave than that of the copper stave. In fact the same effects as the copper stave has been obtained experimentally and simulated. It is suggested that the semisolid/solid rheologically compositing is the most useable technology to produce the copper/steel cooling stave. The further study tasks on it are to have some optimizing researches such as the constructs, dimension and the compositing processes.关键词：Copper;copper/steel composite materials;Cooling Stave;produce
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发布时间：2023-12-18 - 摘要：This paper presents the progress in the investigation of semisolid aluminium alloy design, billet preparing for semisolid processing, the numerical simulation and experimental studies on thixoforming as well as some main achievements in this field. We have presented a new method of semisolid alloy design, and successfully produced for the first time in the world the large scale billet of 500mm in diameter for semisolid slurry. The grain size is fine and uniformly distributed in the billet, which satisfies the requirement of semisolid processing.关键词：near liquidus semicontinuous casting;Numerical Simulation;semisolid thixoforming;Aluminium Alloys
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发布时间：2023-12-18 - 摘要：Research and Development on semisolid metal processing technology was summarized in this paper; and a few representative SSM methods and the correspondingly slurry processing technologies were presented, moreover, the formation mechanism of non-dendritic microstructure under coerced convection. The rheoforming route, in which process flow was simple and the prime cost was low, has been the development direction, and the necessarily condition aimed to manufacture high quality semisolid processed parts is that the supplied semisolid slurry has high density of nuclei suspending uniformly in the bulk melt.关键词：Semisolid metal processing;slurry processing technology;Semisolid Slurry;rheoforming.
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发布时间：2023-12-18 - 摘要：重点介绍国外V法铸造薄膜、铸造生产线等方面的研究成果,以及国内V法铸造的发展概况、成功案例及存在的问题。关键词：V法铸造;EVA薄膜;V法设备
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发布时间：2023-12-18 - 摘要：The special lost foam castings are some new lost foam casting processes that combined the lost foam casting with other casting process. In this paper, the authors introduce their principle, characteristic and research actuality of some special lost foam casting processes including pressurized lost foam casting, low pressure lost foam casting,vibrating lost foam casting, semi-solid lost foam casting,lost foam-shell casting and lost foam suspend casting. Any special lost foam casting process has its technology advantages, but still possesses their faults. In order to play them into application there would be much work to do. The special lost foam casting processes should have their bright future.关键词：special lost foam casting;low pressure lost foam casting;vibrating lost foam casting;semi-solid lost foam casting;lost foam-shell casting
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发布时间：2023-12-18 - 摘要：在简述镁合金熔铸物化学特性及高品质压铸件生产工艺要求的基础上,介绍了当今压铸镁合金熔化浇注、压铸工艺装备、压铸产品开发、压铸工艺废料重熔精炼技术与装备现状,指出了依托技术与装备进步、采用现代产品及工艺模具优化设计技术,是镁合金压铸生产企业快速、高效、低风险形成生产能力、参与市场竞争的关键。关键词：镁合金;压铸;镁合金熔铸
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发布时间：2023-12-18 - 摘要：The Aluminum powder metallurgy alloys have raised prevalent concerns recently because of the merits they possess. Development history, preparation process, characters, current study and application situations are introduced. The future trends are predicted. It shows the direction for the development and application of Aluminum powder metallurgy alloys.关键词：powder metallurgy （PM）;Al Alloys;trends
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发布时间：2023-12-18 - 摘要：Mg-based bulk metallic glasses are of high interest due to their high strength to weight ratio and relatively low price. The development of Mg-based bulk metallic glasses is summarized, with an emphasis on the composition design and the mechanical properties improvement.
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发布时间：2023-12-18 - 摘要：分析铝及其合金的高温热变形特点,重点分析对比铝及其合金高温流变应力模型的研究现状,指出包含参数Z的函数模型由于忽略了应变量ε的影响,仅可用于一定变形程度下一般规律的对比描述;其它模型虽然反映了整个变形过程中应力与各变形参数之间的数学关系,但仍应根据实际材料热变形特性进行分析和选择。关键词：铝合金;热变形;动态再结晶;流变应力模型
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发布时间：2023-12-18 - 摘要：In this paper, the development of the carbon fiber reinforced magnesium matrix composites fabricated by liquid metal infiltration was reviewed, including its fabrication process, properties, interface, application and foreground. Furthermore, some problems in recent studies and the further research directions was discussed.关键词：Carbon Fiber;Magnesium Matrix Composites;liquid metal infiltration;Interface
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发布时间：2023-12-18 - 摘要：The process of cold crucible directional solidification of muliticrytalline silicon for solar cells is studied in this paper, this technique combines the advantages of electromagnetic casting and that of directional solidification. The silicon ingots are cast by withdrawing. There are many defects in the experiments, such as the silicon grains are not melt, sintering of silicon grains, quenching of the melt, incomplete melting, splashing of the melt and break of the new ingot. Those defects are related to the processing and the technical parameters, and can be eliminated by adjusting technical parameters. Silicon ingot with columnar grains and coarse surface, but without crack can be obtained under appropriate conditions.关键词：multicrystalline silicon for solar cells;cold crucible;electromagnetic casting;directional solidification
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发布时间：2023-12-18 - 摘要：In this paper, solidification of pure aluminum melt weighing 1.5 kg under power ultrasonic treatment（UST） was tested. And the effect of UST on solidification structure of aluminum melt with different purity was investigated. Besides, the grain refining effects of mechanical stirring and UST were compared. The results show that the UST was able to refine both the 99.7% pure aluminum melt, and the 99.992% high purity aluminum melt. Compared to the mechanical stirring, the UST can bring out more homogeneous structure without casting defects. Furthermore, the mechanisms of the grain refinement by UST were analyzed. The cavitations stimulated the heterogeneous nucleation at the ultrasonic resonator, and the acoustic flows promoted the dispersion and the precipitation of the nuclei. These two processes were together considered as the main reason why the equiaxed zone was formed.关键词：Power ultrasonic treatment;Grain refinement;Pure aluminum;Solidification structure;Mechanism of grain refinement.
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发布时间：2023-12-18 - 摘要：In the condition of high temperature gradient, the formation mechanism of microstructure of directionally solidified Al-17.5wt%In monotectic alloy is analyzed. The effect of the solidification rate on the microstructure of directionally solidified Al-17.5wt%In monotectic alloy is examined. The results show that the regular fibre of L2 phase of the directionally solidified Al-17.5wt% In alloy changes from fibre, spindle fibre, periodical and regular array of In droplets to random dispersion of In droplets in the aluminum matrix with increasing growth rate. At the same time, the fibre spacing decreases with the increasing solidification rate.关键词：Al-In monotectic alloy;Microstructure;solidification rate;high temperature gradient
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发布时间：2023-12-18 - 摘要：The alloy’s solidifying microstructure has a great effect on the mechanical properties of casting parts and its application fields. In the paper, the research of pouring temperatures and cooling rates on the alloy’s solidifying microstructures has been studied with AlSi7Mg alloy. The results show that the pouring temperatures and cooling rates have a large influence on its solidifying microstructures. When the molten was poured at liquidus temperature, a uniform and fine microstructure would be obtained. While the effecting law of cooling rates on solidifying microstructure was different from that of pouring temperatures. Based on the above results, an ideal solidifying microstructure would be obtained when the molten liquid was poured to graphite cavity at liquidus temperature.关键词：AlSi7Mg Alloy;solidifying microstructure;Pouring Temperature;cooling rates
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发布时间：2023-12-18 - 摘要：The microstructure and solidification mode of AlTiFeNiCuCrx with different Cr content have been studied. The results show that, the alloys exhibit simple BCC and FCC phases due to high entropy effect. With increasing Cr content, the solidification mode of the alloys has a transition from hypoeutectic to hypereutectic. The matrix is composed of primary dendrite phase 、chrysanthemum-shaped eutectic structure and interdendrite phase rich in Cu.关键词：Multi-principal element alloy;High-entropy;Solidification mode;Microstructure
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发布时间：2023-12-18 - 摘要：采用电弧熔炼并直接在冷坩埚中凝固得到了具有单向凝固特征的TiAl合金纽扣锭,应以此研究了合金元素W对单向凝固组织的影响。结果表明,W对TiAl合金单向凝固的枝晶组织有细化作用,当W含量为2.0%时可以将凝固组织的晶粒尺寸降低到50μm。随着W含量的增加,先凝固形成的β相晶粒内部出现网络分布的富W相,并最终转变为B2相。Ti-46Al合金中加入W元素后片层团尺寸得到降低。关键词：TiAl基合金;单向凝固;W;微观组织
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发布时间：2023-12-18 - 摘要：采用相图计算热动力学模型构造凝固体系的自由能,通过相场法模拟了Ti-44Al合金在过冷定向凝固条件下微观组织演化,观察到胞/枝晶共存的微细结构的形成。对胞/枝晶尖端温度场分析表明,结晶潜热的释放导致"领先臂"尖端的固相前沿出现局部正温度梯度有利于这种结构的形成。同时考察了"领先臂"尖端的溶质场分布并计算了溶质分配系数。模拟结果与试验结果有可比性,与理论结果相符合。关键词：过冷定向凝固;微观组织;相场法;模拟
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发布时间：2023-12-18 - 摘要：Al-13Si alloy with different addition amount of Sr were prepared and then poured into three kinds of moulds. Addition amount of strontium and solidification condition on microstructure of Al-13%Si alloy were discussed. It was found that solidification condition and addition amount of Sr were two main factors for modification efficient. The modification is better when the solidification velocity is faster as well as when Sr content is higher. The "post-modification" phenomenon is not found in this research. Remelting has little effect on the melting loss of Sr.关键词：Al-Si eutectic;Sr content;solidification condition;Modification.
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发布时间：2023-12-18 - 摘要：Alternating magnetic field of commercial frequency was used in industrial product line of horizontal continuous casting copper tube billets. The effects of input current intensity of alternating magnetic field and casting parameters were studied to obtain good quality production. The results show that the formerly unhomogeneous columnar grain structure get into homogeneous equiaxed grain structure with the application of alternating magnetic field. When the input current intensity is 50 A, casting speed is 0.0042 m/s,casting temperature is 1 150 ℃ and primary cooling intensity is 1 m3/h, the tensile strength is increased by 15.9% and the elongation is improved by 63.8% compared to those without alternating magnetic field.关键词：Alternating Magnetic Field;copper tube billets;Solidification Structure
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发布时间：2023-12-18 - 摘要：The solid/liquid phase transformation of ZL201 aluminium alloy in near liquidus semi-continuous casting was simulated using multiscale simulation technique. The models of temperature fields and phase transformation were established with respect to the continuous casting process. The solid fraction was used to couple the model between on macro-scale and on mesoscale. The steady state temperature fields of ZL201 alloys were calculated using the extrapolated non-physical boundary proposed in this paper. The average undercooling of the cells in transition region was used to calculate the nucleation rate in the melt with the help of Rappaz’s model. The microstructural evolutions were simulated for ZL201 alloys poured at near liquidus with the casting velocity 1.510 mm/s. It is shown that the casting velocity has large influence on the microstructure of semisolid alloy. Ideal grain size and distribution can be obtained when the casting velocity is in the range 2.0%2.5%.关键词：multiscale simulation;near liquidus casting;liquid/solid phase transformation;ZL201 Alloy
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发布时间：2023-12-18 -
The Design of mould taper for continuous casting steels based on solidification shrinkage simulation
摘要：The finite element model was employed to simulate the solidification and shrinkage of continuous casting steels by means of ANSYSTM. In the model, a gap-dependent heat transfer condition was introduced to modify the function of heat flux,and the variations of material thermal properties, mechanical properties as well yield function with temperature were considered. The solidification and shrinkage processing of four round billets and two square billets provided by enterprise were simulated by indirect coupled method. According to the shrinkage curves of billets, the continuous parabolic tapers for mould were designed.关键词：Mould;Parabolic Taper;shrinkage;Numerical Simulation- 2
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发布时间：2023-12-18 - 摘要：The influence of high magnetic field on structure and property of Cu-16.9%Fe by semi-solid solidification was investigated. The results under high magnetic field showed that the crystal lattices of Cu were distorted. Moreover, the morphology of Fe-rich phases became more irregular and finer. The directions of Fe-rich phases were trended to be elongated along the magnetic field. The conductivity of Cu-16.9%Fe were increased. The analysis showed it was owing to the solubility decreasing of Fe in Cu, which decreased the impurity scattering resistivity.关键词：High magnetic field （HMF）;Cu-Fe;conductivity;semi-solidification
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发布时间：2023-12-18 - 摘要：The effect of temperature,containing-phosphorus master alloys and their addition levels on the recovery of P was investigated in this paper. It has been found that the recovery of P goes up evidently with increasing melting temperature by addition of Al-3P or Cu-8P master alloy, under the same experimental condition, the recovery of P in ZL109 modified by Al-3P master alloy is much higher than that of Cu-8P master alloy.关键词：Al-Si Alloy;Modification;phosphorous recovery
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发布时间：2023-12-18 - 摘要：Methods of fire prevention, labor protection and environmental protection of foundry works are discussed according to production practices and properties of aluminum and magnesium.关键词：Aluminum Alloy;Magnesium Alloy;Casting;Labor protection;Disaster prevention;Environmental protection
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发布时间：2023-12-18 - 摘要：With topological transformation method, the constitutive equation between electric conductivity and microstructure characteristics parameters of hypoeutectic Al-Si alloys is put forward, by which the synthetical effects of refinement and modificaion could be evaluated. The effects of refinement and modification on electric conductivity of A356 alloy are investigated. It is showed that both refinement and modification could improve electric conductivity by changing microstructure characteristics parameters of hypoeutectic Al-Si alloys关键词：A356 alloy;Electric Conductivity;Microstructure;topological transformation;constitutive equation
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发布时间：2023-12-18 - 摘要：As-cast microstructure feature of Al sheet used for pressure can manufacture with high forming properties prepared by different melt-treatment technology was investigated and analyzed with the aids of SEM, EDAX, TEM and selected area electron diffraction（SAED）, etc. It is found that oxide inclusions in the Al sheet are mainly γ-Al2O3, and Fe-rich impurity phases in the sheet are mainly Al3Fe,T1 （Al12Fe3Si） or （AlFeSiRE）,and the crystal structure of （AlFeSiRE） phase is too complicated to determinate it. The effect of melt-treatment technology on the as-cast microstructure of the sheet is remarkable. When the Al sheet is prepared by no or conventional melt-treatment, there are a number of oxide inclusions, these inclusions distribute non-uniformly and gather together in the larger block form, and their size is about 10-40 μm. Fe-rich impurity phases in the sheet are mainly Al3Fe and T1, and a few of the meta-stable phase Al6Fe exist in Al sheet. These Fe-rich impurity phases appear in the coarse, long needle/flake or skeletal form, and are easy to gather together with oxide inclusions. When the Al sheet is prepared by high-efficient melt-treatment, the number of oxide inclusions is very few obviously, and their size is about or less than 4μm, and their distribution is uniform; Fe-rich impurity phases are mainly （AlFeSiRE）, and a small amount of Al3Fe phases also exist in the material. （AlFeSiRE） phases distribute uniformly along grain boundary in tiny group/sphere or short stick form. The phenomenon that Fe-rich phases gather together with oxide inclusions is not discovered in the material.关键词：Al sheet used for can manufacture;melt-treatment technology;microstructure;Oxide Inclusions;Fe-rich impurity phases
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发布时间：2023-12-18 - 摘要：采用动态热/力模拟试验技术对经不同净化方法处理的1235铝合金（铝箔坯料）进行热压缩变形试验,用多元回归法直接求解该合金的热变形材料常数,并重点分析夹杂物含量对热变形材料常数的影响规律。结果表明,净化处理效果对1235铝合金的热变形材料常数、尤其是热变形激活能有着显著影响,处理效果越好,热变形激活能就越低,经高效净化处理的1235铝合金的夹杂物含量最低,Q值也最小（149.51kJ/mol）,具有很好的热塑性变形性能;夹杂物含量与热变形激活能具有正的线性相关性,夹杂物含量越低,热变形激活能也越低,材料更易进行热塑性变形;产生这种影响的原因主要在于氧化夹杂物（Al2O3等）显著影响了铝材热变形过程中的位错运动,对位错产生钉扎作用,限制了位错的束集,增大了扩展位错的宽度,使铝的层错能降低,位错不易产生交滑移,从而使其热变形激活能增大。关键词：1235铝合金;净化处理;夹杂物含量;热压缩变形;材料常数;热变形激活能
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发布时间：2023-12-18 - 摘要：采用热模拟试验技术和OM、TEM等分析,探讨了经不同净化处理的铝箔坯料（1235合金）的热压缩变形组织特征。结果表明:净化处理效果对1235合金的热压缩变形组织结构有着显著的影响。净化效果越好,热压缩变形组织形态越理想,经高效净化处理的1235合金中,氧化夹杂少且细小,原始晶粒最小,其热压缩变形组织最理想;在相同变形条件下,大块夹杂周围位错缠结少,有利于动态再结晶的形核与长大,晶粒较粗大;细小夹杂周围位错高度缠结,位错密度高,限制了再结晶晶粒的长大,细化了再结晶晶粒。关键词：铝合金;铝箔坯料;1235合金;净化处理;热变形;微观组织
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发布时间：2023-12-18 - 摘要：采用热模拟试验技术对经不同净化处理的铝箔坯料（1235合金）进行热压缩变形试验,分析了不同熔体净化处理和热变形条件对该合金热压缩变形过程中流变应力的影响规律。结果表明:该合金热压缩变形过程中存在稳态流变特征;净化处理效果对1235合金高温流变应力的影响显著,净化效果越好,流变应力值更高,材料的塑韧性越好,热加工性能越好。变形温度对高温流变应力和软化过程也有明显影响,变形温度越高,流变应力越低,越易进入稳态变形;该合金是正应变速率敏感材料,其真应力水平随应变速率的增大而升高。该合金在各种热变形条件下均发生了一定程度的动态再结晶。关键词：铝箔坯料;1235合金;净化处理;热压缩;高温流变应力
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发布时间：2023-12-18 - 摘要：Flux and Revolving Spraying Ar were used to remove dissolved hydrogen in the molten ZL101 respectively.The content of hydrogen in the molten aluminum were measured in order to compare the two different refining processes. Primary aluminum molten and refined aluminum molten by the aforementioned two processes were fabricated to samples adopting sand casting as well as permanent mould casting.Then all the samples were assessed the porosity degree. The degassing experiment shows that Revolving Spraying Ar are more effective in lowering the hydrogen content. And after Revolving Spraying Ar, the first-degree porosity can be obtained by both sand casting and permanent mould casting.关键词：Aluminium-Silicon Alloy;Refining;Degassing;Porosity Degree
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发布时间：2023-12-18 - 摘要：The modification of the primary silicon in hypereutectic Al-20wt.% Si alloy by boron has been investigated. The results show that boron addition can obviously modify the primary silicon in hypereutectic Al-20wt.% Si alloy. The size of the primary silicon decrease with the increase of boron addition content from 0 to 0.065 wt.%,and the minimum size of the primary silicon can be obtained at the boron addition content of 0.065 wt.%. But, the size of primary silicon increases if the boron addition content is continuously increased after the boron content of 0.065%关键词：Hypereutectic Al-Si Alloy;Al-B Master Alloy;Primary Silicon;Modification
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发布时间：2023-12-18 - 摘要：The effect of electromagnetic field and ultrasonic field on the grain refinement of horizontal continuous casting Al-1Si alloy microstructure was investigated. Experimental results show that: with electromagnetic field outside the mold, the solidification structure of the alloy is refined with the increase of current, but when the current increases to 120 A, the microstrucrure becomes coarse; with 1000w power ultrasonic field, the solidification structure is refined and the grain size reduces from 94.1 μm to 31.2 μm. The mechanism of the refinement of Al-1Si under electromagnetic field and ultrasonic field is preliminary discussed.关键词：Electromagnetic Field;Power Ultrasonic;Horizontal Continuous Casting;Al-1Si Alloy;Grain Refinement
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发布时间：2023-12-18 - 摘要：The impact toughness of modified and non-modified hypereutectic Al-20%Si alloys were studied in the different content of P and RE. The results show that the complex modification of P and RE can obviously improve impact toughness of hypereutectic Al-20%Si alloy. When the tested alloys modified with 0.08%P and 0.6%RE, the optimal impact toughness of modified alloys is obtained. The impact toughness is increased to 11.0098J/cm2 from 9.786 2 J/cm2 of the unmodified alloy, increased by 12.5%.With the toughness fracture, the mechanism of impact fracture is mainly the brittleness fracture. It can be attributed to the the refinement of primary silicon and eutectic silicon particles and the increase of strength and ductibility of alloys caused by the complex modification of P and Re.关键词：Hypereutectic Al-Si Alloy;Complex Modification;Impact Toughness
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发布时间：2023-12-18 - 摘要：Solidification processes of ZAlSi7Mg-xY （0.1,0.3,0.5wt.%） alloys were investigated by thermal analysis. The microstructures were observed by using optical microscopy and scanning electron microscopy. Effects of different concentrations of Y on tensile performance both as cast and T6 heat treated were studied at room temperature respectively. The results shown that: with increased concentration of Y, little changes happened in liquidus while it result in an obvious depression of solidus curve and eutectic arrest temperature in the solidification process,so the solidification interval increased significantly. The optimization of microstructure and performance was obtained when concentration of Yttrium is 0.1wt.% .With an increment of Yttrium, more large flakelike compound of yttrium gathered in grain boundaries, the performance especially the elongation of the alloy decrease remarkably.关键词：ZAlSi7Mg alloy;Yttrium;Solidification Process;Microstructure and performance
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发布时间：2023-12-18 - 摘要：In this study, a novel Al-Si-P master alloy has been successfully prepared to modify and refine primary Si in eutectic and hypereutectic Al-Si alloys. Since Si has similar crystal structures and lattice parameters with AlP, it can control the distribution of AlP in Al-Si-P master alloy. With addition of Al-Si-P master alloy, AlP particles pre-formed in Al-Si-P master alloy can nucleate primary Si which contribute to the precipitation and refinement of primary Si in eutectic and hypereutectic Al-Si alloys respectively. Forthermore, Al-Si-P master alloy has the advantages of stable and long-term modification efficiency, simple operation, no pollution to environment and low comprehensive cost, and can be used widely in the aluminum industry.关键词：Al-Si-P master alloy;Al-Si Alloy;Modification;primary Si
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发布时间：2023-12-18 - 摘要：在不同净化熔剂对A356铝合金处理试验的基础上,主要从净化效果（含杂量、力学性能、铝净得率、渣中铝含量）、对环境的污染程度（有害气体排放量）以及熔剂价格等指标的考察,根据权重系数比例和影响幅度进行环境负荷的比较评估。结果表明,与常规熔剂处理相比,高效排杂净化熔剂RJ2及其处理工艺（B1）在各项评估指标（铝净得率、渣中铝含量、废弃物排放、熔剂价格等）的环境影响因子上均显示出最小值,其有害气体排放量不仅低于常规工艺,也明显小于相应国家标准限值,说明熔剂RJ2不含有对环境和人体有害的物质。定量计算表明:仅考虑有害气体排放程度（定性）时,最佳工艺（B1）的总环境影响因子仅为1.20,且各评估指标中环境负荷均为最小;将有害气体排放程度的试验数据量化,并将其计入总环境影响因子后,常规工艺的总环境影响因子达4.13,而最佳工艺（B1）的总环境影响因子仅为2.07,即环境负荷最小。关键词：铝合金;净化熔剂;净化效果;环境负荷;环境影响因子
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发布时间：2023-12-18 - 摘要：The refining effect of Al5Ti1B0.5RE master alloy on A356 Al alloy was studied, and microstructures of A356 Al alloy and the master alloy were analysed by OM、SEM、EDAX etc. The results showed that the master alloy had not only obvious effect of grain refinement, also a significant role in refining dendrite grain of A356 Al alloy. RE elements played an important role in the master alloy, that is, RE could easily form （AlTiRE） phase in the master alloy, but （AlTiRE） phase was unstable in Al melt and could dissolve quickly by releasing RE elements, which deceased the surface energy of Al melt and the tendency of TiB2 particles getting together in Al melt, thus increasing. the number of nuclear particles. Moreover, RE elements could easily get adsorption together between the grain boundary and the phase boundary of Al alloy, thus filling the defects of grain surface, and hindering TiAl3 growing and the formation of needle or strip TiAl3 phase, which increased the nucleation rate on refinement nuclei. Furthermore, RE could effectively guarantee metallurgical quality.of the grain refiner and Al melt, thus also enhancing the effect of the grain refiner.关键词：Al Alloy;AlTiBRE Master Alloy;Rare Earths;Grain Refinement;Microstructure
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发布时间：2023-12-18 - 摘要：This article investigated the relation between the structure morphology and casting conditions of A356 aluminum alloy casting. With the help of structure analysis and computer simulation of cooling rate, the quantitative relation between eutectic content and cooling condition was studied. The results showed that the eutectic content in the solidification structure was increased while the cooling rate of casting increased, the evolution of primary phase was from coarse dendritic to rosette dendritic, We can precisely predict the cooling condition in different positions of the casting by computer simulation,and provide a kind of reference for the prediction of the microstructure and property in the different locations of casting. These lay the necessary foundation for the development of casting parts with complex shape and varied demands.关键词：Metal Mold;eutectic content;Cooling Rate;Computer Simulation;A356
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发布时间：2023-12-18 - 摘要：The impact toughness of A356 alloys with the same ratio of w（Ti）/w（B） and the same titanium content,produced by different Ti and B alloying methods were investigated. The results show that the Ti、B alloying methods has an obvious effect on the microstructure and impact toughness of A356 alloys.,The A356 alloys produced by electrolytic low-titanium aluminium alloys have the optimum grain refinement effect and impact toughness. The reason is that the refinement of microstructure increases the growth free path of microcrac. The microcrack growth need absorb higher propagation energy. Though the impact toughness of A356 alloys refined with electrolytic low-titanium aluminium alloys+Al-B master alloys almost has the same values as that alloys alloyed with melting Al-Ti-B master alloys and melting K2TiF6+KBF4 ,the former alloys have the higher fracture resistance than that of the latter alloys because of the former alloys have higher crack propagation energy.关键词：Ti B alloying methods;A356 Alloys;Impact Toughness
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发布时间：2023-12-18 - 摘要：Because flake-like TiAl3 particles in Al-Ti-C master alloys prepared in a melt reaction method dissolve slowly when they are added into Al melt, Ti atoms cannot be released rapidly to play the assistant role of grain refinement, leading to a poor refinement efficiency of Al-Ti-C master alloys. A united refinement technology by Al-10Ti and Al-Ti-C master alloys was put forward in this paper. The rational combination of fine blocky TiAl3 particles in Al-10Ti and TiC particles in Al-Ti-C can improve the nucleation rate of α-Al. It not only improves the grain refinement efficiency of Al-Ti-C master alloys, but also reduces the consumption.
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发布时间：2023-12-18 - 摘要：The research focuses on the microstructure and grain refining performance of Al-Ti-C-B master alloy.The results show that the Al-Ti-C-B master alloy has better refining effect for commercial pure aluminum than Al-5Ti-0.4C master alloy,and greater ability to resist fading.It is believed that the refining performance is related to the interaction of particles in phase clusters.关键词：Al-Ti-C-B master alloy;Al-5Ti-0.4C;Grain Refining;Stirring
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发布时间：2023-12-18 - 摘要：found temperature 、found method、found velocity ect parameter determine 6063 6063 aluminium alloy’s final quality.According to produce practice ,come into being a conclusion to control every technical parameter to produce high quality aluminium alloy.
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发布时间：2023-12-18 - 摘要：This article investigated the relation between the microstructure and hardness after aging with different deforming temperatures. Microstructure analysis and hardness measure are used to study the thermomechanical treatment for continuous casting Aluminum alloy 6082. The microstructure and property of Aluminum alloy 6082 can be improved by thermomechanical treatment, compared with room-temperatue deforming; the microstructure of hot deforming was rarely affected by the deforming temperature. The hardness of 6082 aluminum alloy were substantially increased by deforming in 540 ℃ and aging 8 h in 170 ℃.关键词：Thermomechanical treatment;Solution Treatment;Aging;Al Alloy 6082
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发布时间：2023-12-18 - 摘要：介绍了是如何针对发电机支架的结构特点,找准产生铸件变形的工艺环节,制定出合理的改善方案,从而降低发电机支架因铸件变形产生并流出废品的过程。关键词：发电机支架;开模变形;顶出变形;冷却变形;清理变形
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发布时间：2023-12-18 - 摘要：The refining technology of aluminum alloys containing zirconium was studied in this paper and the effect mechanism has also been discussed. The experimental results show that the adding order of Zr has important influences on the refining effect of Al-Ti-C master alloy. The refining effect of Al-Ti-C can be poisoned if Zr has been added into the melt in advance while it can have excellent refining effect by adding Al-Ti-C into the melt before the addition of Zr.关键词：Zr-bearing aluminum alloys;poisoning;refining technology
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发布时间：2023-12-18 - 摘要：ZL205A alloy samples were obtained by melting ZL205A alloy and different percentage of yttrium. The effects of yttrium contents to as-cast microstructure and solidification process of ZL205A alloy were studied by optical microscope （OM）, scanning electron microscope （SEM） and thermal analysis. Etc. The results showed that the element cause a depression of the eutectic arrest, reduction of freezing range and also result in refined and modified to as-cast microstructure and θ（Al2Cu） phases, respectively. When yttrium content was 0.05 wt.%, the mechanical properties of alloy were better than primary alloy, but with further increasing of the yttrium content, the mechanical properties deteriorated. However, the addition of yttrium of making the microstructure fine is 0.3%. The mechanical properties were better again.
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发布时间：2023-12-18 - 摘要：为探讨含锶铝屑材料对活塞合金的影响,以指导活塞生产配料,防止因配料失误而产生大量废品,进行了含锶铝屑按不同比例配入活塞合金中的试验。由于Sr进入合金中对活塞合金的变质及精炼除气的影响,因而在实际生产配料时应慎重对待。关键词：Sr;铝屑材料;活塞合金
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发布时间：2023-12-18 - 摘要：Based on principle of electromagnetic pump, the aluminum low pressure casting device that consist of electromagnetic pump and holding furnace is developed. Through experimenting and experimental data treatment, the relation between the work flow rate （Q）、the static pressure （ΔP ） and the low pressure casting process of the turbo-charge blade wheel have been established. The result of casting is that produced the qualified blade wheel not only the functions are good, but also the product qualified rate is high.关键词：Electromagnetic Pump;Low Pressure Casting;the blade wheel;Aluminum Alloy
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- 149
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发布时间：2023-12-18 - 摘要：The rotating and puffing argon method is an effect way to decrease hydrogen for aluminum alloys. According to orthogonal table experiment theory, the experiment data were treated with using difference analytical method to obtain the optimal techniques parameters. The optimal techniques parameters: the rotate rate is 600 r/min, flux is 0.4 m3/h, refine time is 6 min and static time is 5 min.关键词：The rotating and puffing argon method;Refining;Aluminum Alloys
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- 145
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发布时间：2023-12-18 - 摘要：Effects of different lubricants on the Green density and sintering density of Al-12Si-2Cu-0.1Sn, Al-12Si-2Cu-0.1Mg and Al-12Si alloys were studied. Results show that the lubricant comprising PEG and EBS can improve the density of the alloys significantly. The largest green density and sintering density can be attained when the proportion of PEG to EBS is 1∶2. It has practical significance for the development and application of the PM Al-based alloys.关键词：Al-based alloy;powder metallurgy （PM）;lubricant;Density
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发布时间：2023-12-18 - 摘要：Aluminum foam is a kind of ideal environmental protection material, which is not only light weight, energy absorbing, incombustible, innocently, corrosion protection and resisting high temperature, but also have good sound absorbing and insulating properties, exhibit a reduced conductivity for both heat and electricity. Furthermore, they can be integrated recycled. These significant advantages make aluminum foam apply in many fields. The vesicant for manufacturing aluminum foam which is the most important in all technology is so expensive that the price of aluminum foam is too expensive to apply in more extensive areas. Hence, the development of lower cost and high efficiency vesicant is the bottleneck of industrialization for aluminum foam.关键词：Aluminum Foam;Industrialization;Bottleneck;Vesicant
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- 308
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发布时间：2023-12-18 - 摘要：The characters of microstructure and dynamic softening behavior of aluminum sheet used for easy-open can during hot deformation were studied and the dynamic softening behavior were discussed. The results show that dynamic recovery occurs at low temperature with a stain rate of 0.1 s-1 and dynamic recrystallization takes place when the temperature is higher than 723 K。Dynamic recrystallization occurs at low strain rate when the temperature is 673 K. With the increase of strain rate, dynamic recovery and dynamic recrystallization take place at the same time. However, geometry dynamic recrystallization occurs when strain rate is higher than 5.0s-1.
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- 89
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发布时间：2023-12-18 - 摘要：摩托车上的汽缸盖有采用低压铸造和重力铸造的,出于成本低、开发快速的特点,采用重力铸造有许多优点,同一个产品,只要模具足够多,就可以立即上量,达到年产100万、几百万的能力。这种模具的大批量,产品的大批量,以及成本的考虑,必然要求模具结构合理和模具制造工艺达到较高水平。关键词：汽缸盖;重力铸造;模具;制造工艺
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- 155
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发布时间：2023-12-18 - 摘要：Drawbacks associated with permanent metallic implants lead to the search for degradable metallic biomaterials. Magnesium alloys have been highly considered as Mg has a high biocorrosion potential and is essential to bodies. In this study, corrosion behaviour of pure magnesium and magnesium alloy AZ31 in both static and dynamic physiological conditions （Hank’s solution） has been investigated. It is found that the materials degrade fast at beginning, then stabilize after 5 days of immersion. High purity in the materials reduces the corrosion rate while the dynamic condition accelerates the degradation process. In order to slow down the degradation process to meet the requirement for their bio-applications, an anodized coating is applied and is proved as effective in controlling the biodegradation rate.
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发布时间：2023-12-18 - 摘要：研究了Al-Ti-C对双辊铸轧镁合金薄带的组织影响,并利用铸轧坯直接进行热轧,研究了细化有剂对镁合金微观组织的影响。结果表明,添加了细化剂Al-Ti-C的薄带铸轧组织基本为等轴晶,晶粒明显细化。关键词：镁合金;双辊铸轧;细化剂;等轴晶;再结晶
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- 112
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发布时间：2023-12-18 - 摘要：主要研究了添加RE元素Ce、Dy对AZ31镁合金显微组织和轧制性能的影响。结果表明,加入Ce、Dy后,AZ31合金的组织被明显细化,还生成了析出相Al4Ce、Al2Dy和MgDy3。Ce、Dy可以显著地改善AZ31合金的轧制性能,加入Ce、Dy后形成的RE相在经过高温热处理后几乎不溶于基体,它们可以促进再结晶形核,生成更多细小的等轴晶,从而显著地提高了AZ31合金的轧制能力。但当Dy的添加量达到一定程度时,含RE合金的轧制性能有所下降,但仍优于未加RE的AZ31合金。关键词：AZ31合金;Ce;Dy;显微组织;轧制性能
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- 179
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发布时间：2023-12-18 - 摘要：Product of TRC magnesium alloy sheet will the trend of the use of for its excellent mechanic property.To get the forming characteristic of TRC AZ31B Magnesium alloy sheet warm tensile experiment was performed at deformation temperature 473 K～623 K and strain rates ranged in 0.001～1 S-1. It was observed that a in low-strain-rate and high-temperature regime the alloy follows a power-law behavior, and the relationship between flow stress and deformation temperature as well as strain rate can be represented by exponential equation at high-strain-rate and low-temperature. Dynamic recrystallization （DRX） takes place during the deformation process, and the average dynamically recrystallized grain size minished with the rising of deformation temperature by Analysis of microstructure.关键词：TRC;warm hot deformation;Microstructure;Dynamic Recrystallization
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发布时间：2023-12-18 - 摘要：The specimens were cut from different extrusion direction, and the effect of annealing heat treatment on the microstructure and mechanical properties of AZ31B sheet were investigated. The results show that the sheet are composed of α-Mg primary phase and Al2Mg phase. The surface texture, which is formed in the course of extrusion deformation and parallelled to the plate （0001）, results the mechanical propertis of the sheet in different direction are different, and the mechannical propertis of the specimens in 90° direction are highest with compared to other directional specimens, the tensile strength is 274.3 MPa, and the elongation is 14.5%. The mechanical propertis of the annealing heat treatment specimens are increased, which are attributable to both the reduced grain size and the recrystallization microstructure, and the mechannical propertis of the specimens in 0° direction are increased apparently. In addition, the fracture characterics of the specimen is mixture of fragility and toughness in extrusion state, but it is changed to toughness fracture after annealing heat treatment.关键词：AZ31B Magnesium Alloy;annealing heat treatment;Recrystallization;Mechanical Properties;Texture
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- 158
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发布时间：2023-12-18 - 摘要：The effect of deformation temperature and deformation speed on the limit drawing ratio （LDR） and microstructure of the roll-casting AZ31 magnesium alloy sheet. The limit drawing ratio （LDR） of the roll-casting AZ31 magnesium alloy sheet reaches 2.5 when the deformation temperature is between 250℃ and 300 ℃. Low drawing speed benefits the enhancement of the drawing performance. The microstructure after drawing deformation is mainly twins. With the increasing of the temperature, the recrystallization occurs during the drawing deformation and there are many refine recrystallized grains around the grain boundaries.关键词：AZ31 Magnesium Alloy;drawing;limit drawing ratio;Microstructure
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- 191
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发布时间：2023-12-18 - 摘要：A type of Mg-Al-C master alloy for grain refinement on Mg-Al based alloys was fabricated by a special powder metallurgy method. In the master alloy, Al（C） solid solution is located at the boundaries of magnesium particles. Grain refinement experiments reveal that the master alloy can refine AZ31 （Mg-3%Al-1%Zn） efficiently. With addition of 3wt.% Mg-Al-C master alloy, the grain size of AZ31 was decreased from 850 μm to 260 μm. The mechanism on grain refinement of AZ31 magnesium alloy by the Mg-Al-C master alloy was discussed.关键词：AZ31 Magnesium Alloy;Grain Refinement;Mg-Al-C Master Alloy
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发布时间：2023-12-18 - 摘要：The cylindrical compression test is employed in this paper in order to study the deformation behavior of AZ80 Mg alloy at high temperature. The results show that with the increase of strain rate and the decrease of deformation temperature, the flow stress increases under the circumstance that the range of temperature, strain rate are 200～350 ℃ and 0.002～1 s-1 respectively. The constitutive equation of AZ80 Mg alloy during hot compression is deduced by linear regression analysis. The sensitivity exponent of strain rate increased with the increase of deformation temperature. The value of critical strain for dynamic recrystallization was determined from the strain-stress curves. The equation related to the Zener-Hollomon parameter was obtained too.关键词：AZ80 Mg alloy;Constitutive Equation;Sensitivity Exponent of Strain Rate;Critical Strain
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发布时间：2023-12-18 - 摘要：Micro-arc oxidation is an advanced surface protective treatment technology of forming ceramic coatings on the metals. It is a development direction of magnesium alloy surface treatment technology. The processes of Micro-arc oxidation is complicated and chooses suitable process parameters, and optimize the process to further improve the performance of the oxidation coating is essential. In this paper through a lot of tests, studies current density, frequency, duty cycle and oxidation time on the AZ91D ceramic coating. The result of experiment shows, best technical parameters is: current density 1.0 A/dm2, frequency 600 Hz, duty cycle 20%, oxidation time 20min.关键词：Micro-arc Oxidation;Magnesium Alloy;AZ91D;technical parameters
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发布时间：2023-12-18 - 摘要：The effects of holding time and concentration of SF6 on the protection of AZ91D magnesium alloy were investigated in a sealed furnace with a cover gas mixture of N2 and SF6. The morphology, thickness, composition and structure of the surface films were also studied. The results show that the surface film is compact with a thickness of 0.6 to 1.4 μm, containing F and Mg elements with an atomic ratio of 2∶1, which forms MgF2.The surface film of MgF2 prevents magnesium alloy from evaporation and protects magnesium alloy melt. The concentration of SF6 in the gas mixture has a great influence on the protection of the magnesium melt, the magnesium melt was protected when the concentration of SF6 is greater than 0.03vol.%, while a protection failure occurred under a concentration of 0.01vol.% SF6. When the concentration of SF6 is 0.1vol.%, the magnesium alloy was protected for a holding time from 7.5 min to 120 min. A relatively thinner surface file was found when the holding time was 7.5 min, while no significant change in thickness of the surface film was found for a holding time from 15 min to 120 min.关键词：magnesium alloy;sealed furnace;sulfur hexafluoride;Surface Film
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发布时间：2023-12-18 - 摘要：A type of Al-Al4C3-TiC master alloy was fabricated by melt in-situ reaction. In the master alloy, Al4C3 particles with a size of 2.5-8 μm were surrounded by TiC particles with a size of 0.5-1.5μm. Grain refinement experiments reveal that the master alloy can refine AZ31 efficiently. After addition of 1wt.% Al-Al4C3-TiC master alloy, the grain size of AZ31 was decreased from 1 050 μm to 260μm. Al4C3 particles or Al4C3 particle clusters act as the nucleation sites leading to the evident grain refinement.关键词：Mg-Al based alloys;Grain Refinement;Al-Al4C3-TiC master alloy
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发布时间：2023-12-18 - 摘要：This article mainly discussed the structure of Mg-7Gd-5Y-1.2Nd-Zr magnesium alloy as-cast. The behavior of alloy during the hot deformation process was investigated on Gleeble-1500D hot simulator with the strain rates 0.002, 0.01, 0.1, 1 s-1 and the temperature range was 573 K to 723 K. The maximum deformation degree was 60%. It could be applied to practical hot working for magnesium alloy.The experimental results show that the relationship between stress and strain is obviously affected by the strain rate and deformation temperature. The peak flow stress becomes higher with increasing the strain rate at the same temperature, and becomes lower with increasing the deformation temperature at the same strain rate. The melting of eutectic structure during the hot deformation process was very important to decrease the flow stress.When the stain rate was 0.1/s, discontinuous recrystallization became obvious and it was a great disadvantage to the hot deformation process. The average deformation activation energy Q and the strain coefficient n were 243.5 kJ/mol and 4.2, also it was controlled by temperature directly and by strain rates indirectly.
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发布时间：2023-12-18 - 摘要：The microstructure and mechanical properties of Mg-3Nd-0.2Zn-0.4Zr（wt.%）（NZ30 K） alloy in as-cast, solution-treated and aged condition were investigated. As-cast NZ30K alloy consisted of α-Mg matrix separated by coarse inter-granular Mg12Nd compounds. After solution treatment, the inter-granular Mg12Nd compounds disappeared and lots of fine Zr-containing particles distributed at grain interiors. During aging process, fine plate-like phases precipitated at the prismatic planes of α-Mg matrix, which strengthened the alloy, while the the Zr-containing particles were still at grain interiors. Different aging process led to different precipitates. The precipitates are probably β″ meta-stable phases with DO19 structure in 200 ℃ peak-aged alloy, while in 250 ℃×10 h aged alloy they are mainly β’ meta-stable phases with fcc structure. 200℃ peak-aged NZ30K alloy had the best mechanical properties at room temperature and yield strength, ultimate tensile strength and elongation are 142 MPa, 305 MPa, 11%, respectively. NZ30K alloy had different fracture pattern in different thermal conditions: as-cast alloy mainly fractured inter-granularly; solution-treated and 200 ℃ peak-aged alloy mainly fractured trans-granularly; 250 ℃×10 h aged alloy fractured in a mixture pattern.关键词：Mg-Nd-Zn;Precipitation Strengthening;Microstructure;mechanical property.
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发布时间：2023-12-18 - 摘要：The silicon bronze was first successfully used for casting art statue of 10 meter high lion in China, which was installed in Macao. The composition, casting and welding techniques, and surface treatment of casting silicon bronze are investigated. The solution to avoid hot tear is also proposed. Compared with tin bronze, the silicon bronze has good casting and welding performance, and also lower cost. It will have wide prospect in the application of large casting art works.关键词：Art Casting;Bronze lion;Casting;Welding
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发布时间：2023-12-18 - 摘要：介绍了生产电工用稀土铜母线的主要工艺技术,分析了稀土在电工用铜母线生产中的作用。生产实践表明:稀土具有良好的净化熔体、细化晶粒及杂质相变质作用,当Ce加入量为0.066%时,铜母线成品的硬度（HB）及导电率分别比国家标准值提高23%、1.5%,可满足大多数场合的使用要求。关键词：电工用铜母线;稀土;硬度;导电率
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发布时间：2023-12-18 - 摘要：The effect of Ni on the microstructures and mechanical properties of heat-resistant cast Cu-Ni-Al alloy was analyzed by using optical microscope, EMPA, hardness and compression test. The results show that the Brinell hardness HB,ultimate compression strength σbc and yield compression strength σ0.2pc of the alloy at room temperature increase by 25.2%, 82% and 70.5%, respectively, with the increase in Ni content from 10% to 25%. Meanwhile, the Brinell hardness of the alloy at the elevated temperature 500 ℃ increases by 40%. The improvement of the mechanical properties of the alloy by increasing Ni content is attributed to the solution strength of Ni in the copper matrix and second-phase strength of the formation of some complex compounds.关键词：Heat-resistant Cast Cu-Ni-Al Alloy;Microstructure;Mechanical Property
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发布时间：2023-12-18 - 摘要：In this paper, three kinds of titanium alloying methods include that low-titanium aluminum produced by electrolysis, aluminum-titanium master alloys and villiaumite were chosen. The influence of titanium alloying methods on the microstructure and wear behavior of Zn-Al alloy was studied. The test results show that it is an effective for grain refining of Zn-Al alloy by adding titanium to the melt before casting. The addition of titanium by electrolysis is the most effective for grain refining of the Zn-Al alloy. The reson can be attributed to the titanium atoms evenly spread to the whole melt rapidly under stirring action of electromagnetic field and, the better capacity of heterogeneous nucleation of in-situ precipitating heterogeneous nucleation sites. The finer grain size increases the grain boundary areas and it causes that the grain boundary has better ability of prohibit dislocation passing through. Thus, the binding ability of the base is strengthened. The test alloy containing titanium by electrolysis showed the highest wear resistance.关键词：High alumnium zinc-based alloys;Titanium;Microstructure;Wear property
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发布时间：2023-12-18 - 摘要：It is discussed in this paper that the ZA27 alloy is modified by Al-Ti alloy together with B salt. the initial phase of ZA27 alloy turns from rough grains into uniformly distributed fine ones; the casting defects were obviously reduced. the modification makes ZA27 alloy plastically increase greatly, the percentage elongation improved from 4.0% to 9.2%,the hardness unchanged basically.关键词：ZA27 Alloy;plastic;Titanium;boron
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发布时间：2023-12-18 - 摘要：Ti46Al0.5Si0.5W alloys ingots directional solidified by cold crucible with flakiness ratio 2.5:1 are heat treated differently. The structure and mechanical properties of those ingots as cast and as heat treated are studied. The results show that heat treatment can change the structure and mechanical properties, appropriate heat treatment can refine grains and lamella, and homogenize structure. Grain will grow bigger when the ingots are heated above 1360℃, but will not change below 1150℃. Rapid heating cyclic heat treatment will refine structure and improve mechanical properties.关键词：TiAl alloys;heat-treatment;structures;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The TiAlN films are deposited on polished face of Si（100） wafer and polished face of high speed steel separately by arc ion plating compounded with intermediate frequency unbalanced magnetron sputtering and the properties of TiAlN films and TiN films which deposited by arc ion plating is also tested and compared. The analysis results of SEM, EDS and XRD indicate: the size of droplets on the surface of TiAlN are smaller than that on the TiN films, the defects are eliminated at a large scale, and the microstructure of the surface is more compact and well mixed. The content of Al element in TiAlN films is around 0.86 %（ atm）, and the atoms ratio of Ti and N element is about 1∶1. The distortion in TiN films’ crystal structure is caused by the addition of Al element, and the lattice-constant of the TiN crystal structure is decreased. The mechanical properties of TiAlN films is increased by nearly 30%, compared to the TiN films.关键词：intermediate frequency unbalanced magnetron sputtering;arc ion plating;TiAlN films;TiN Films
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发布时间：2023-12-18 - 摘要：The effect of adding Gd to Zr-base bulk amorphous alloy on glass formation ability （GFA）,Structure transformation and thermal characterisation, has been studied by X-ray diffraction （XRD） and Differential scanning calorimetry （DSC）.The result show that the additiong of Gd increased average distance of atom, changed short-range order area, the reduced glass transition temperature Trg （Trg=Tg/Tm）get the bigest value 0.7016 in content of 5% but the supercooled liquid region △Tx decrease from 50.1 to 33.9 when the content of Gd from 1% to 10%.关键词：Bulk Amorphous Alloy;Thermal Stability;glass formation ability
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发布时间：2023-12-18 - 摘要：In order to improve the quality of Fe-Ni expansion alloy produced by an alloy plant, we have made the improvement of alloy composition to join a few rare earth to alloy. We made chemical composition analysis and microstructure appearance analysis to improved samples. Chemical composition analysis showed that the joins of the mixed rare earth can be able to cause C, S, O content decreased more than half compared to the HCC casting samples, S, O content of improved samples and S, O content after ESR quite . So that it is a good method to decrease gas content. It is showed that inclusions’ number and size decreased, and the distribution is small spherical particles by EPMA analysis.关键词：Fe-Ni alloy;expanding alloy;Non-metallic Inclusions;RE
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- 143
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发布时间：2023-12-18 - 摘要：Effects of various amount addition of heavy rare earth yttrium on microstructure and mechanical properties of high manganese steel was studied. Results showed that with the addition of rare earth increased, austenite grain size refined at first and then enlarged. Tensile strength and impact toughness improved firstly and then decreased . The size of austenite reached the minimal value （109.88μm） while tensile strength and impact toughness reached the maximum value（200.64 MPa and 1 088.11 KJ/m2 respectively）when yttrium content was optimal and found to be 0.3wt.% （remains 0.023 wt.%）.Metamorphic mechanism research indicated that adding small amount of Y formed less rare earth oxide nucleuses to refine the grain size, the ensile strength and impact toughness could not improve obviously. Excessive amount addition poisoned the nucleuses causing the grain size growth, tensile strength and impact toughness were destroyed because of the second phase continuously distributed nearby the crystal boundary.关键词：yttrium;heavy rear earth;inoculation;High Manganese Steel
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发布时间：2023-12-18 - 摘要：The recent status in the fabrication of nano-sized SiC particle reinforced magnesium matrix composite is reviewed in this paper, based on which the focus lies in the progress of magnesium matrix nanocomposite fabrication by the high energy ultrasonic dispersion method. The mechanical properties of nano-sized SiC reinforced magnesium matrix composite, which is prepared with the above method, are measured. The microstructure of this nanocomposite is analyzed by SEM, TEM, EDS and XRD. Several major challenges in the preparation of magnesium matrix nanocomposite are also pointed out. The future trends and the application of nano-sized SiC/Mg composite are forecast .关键词：nano-sized SiC;Magnesium Matrix Composite;ultrasonic dispersion
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发布时间：2023-12-18 - 摘要：In-situ reaction preparing technique is a hot-point in the research of metal matrix composites （MMCs）.This paper reviews the methods of preparation by in-situ reaction technique, includes SHS, XD,CR,VLS,DIMOX,MA,LSM,PRIMEX methods and the preparing method of in-situ surface composite layer. Analysis and studies are carried out on hot-point and thorny issues.关键词：In situ synthesis;Metal Matrix Composite;preparation technique
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发布时间：2023-12-18 - 摘要：Influences of different heat treatment methods on the microstructure, compression properties and wear resistance of SiCp/AZ81 metal matrix composites were investigated. The experimental results showed that heat treatments can enhance the wear resistance of SiCp/AZ81 metal matrix composites, and solution treatment is the best method, compared with the cast SiCp/AZ81 metal matrix composites, and the wear resistance increase by 51.8%. Both aging treatment and solution + aging treatment can enhance compression properties of SiCp/AZ81 metal matrix composites, especially that compression strength reach 238.7 MPa after aging treatment. The main reason for the enhancement in the wear resistance and compression properties is that heat treatment will change the distribution and morphology of β-Mg17Al12 phase.关键词：Heat Treatment;SiCp/AZ81 metal matrix composites;Compressive Property;Microstructure;Wear Resistance
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发布时间：2023-12-18 - 摘要：By introducing ZrO2 （4Y） powder into the thermit, the large-scale plates of novel Al2O3/ZrO2 （4Y） composite ceramics with different component and microstructure were prepared through combustion synthesis under high gravity, and the correlations of component,microstructures and mechanical properties of composite ceramics were investigated. XRD, SEM and EDS showed that Al2O3/33%ZrO2 （4Y） were composed of random-orientated rod-shaped colonies consisting of a triangular dispersion of orderly t-ZrO2 submicron fibers, surrounded by inter-colony regions consisting of nano-micronmeter spherically-shaped t-ZrO2 grains; meanwhile, Al2O3/40%ZrO2 （4Y） were comprised of micron-meter spherically-shaped t-ZrO2 grains, surround by irregularly-shaped α-Al2O3 grains and a few colonies. Compared to the international directionally-solidified Al2O3/ZrO2 （Y2O3）, the increase in hardness and flexural strength of Al2O3/33%ZrO2 （4Y） in the experiment was due to high densification, small-size defect and high fracture toughness induced by compressive residual stress toughening and transformation toughening mechanisms; meanwhile, in despite of the moderate decrease in hardness, flexural strength and fracture toughness of Al2O3/40%ZrO2 （4Y） were increased by 19.0% and 311.1%, respectively, and the reinforcing of the materials was considered to be a result of small-size defect in micron-meter spherically-shaped t-ZrO2 grain matrix and high fracture toughness induced by stress-induced t-ZrO2 transformation toughening and transformation-induced micro-crack toughening mechanisms.关键词：Al2O3/ZrO2 （4Y）;Combustion Synthesis;High Gravity;self-growing;Reinforcing and Toughening
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发布时间：2023-12-18 - 摘要：Using Mo, Si, and C element powders as starting materials, a spark plasma sintering （SPS） was employed to synthesize high-density MoSi2 and MoSi2-SiC composite. Friction and wear behavior of MoSi2 and MoSi2-SiC composite were investigated. The results show that with increasing of loads, friction coefficient of the synthesized materials decreased and wear rate got minimum value with load being 150 N. Addition of SiC, the wear rate of MoSi2-SiC composites reduced gradually and the wear resistance of the composites was better than that of single MoSi2. The study of wear mechanism shows that adhesions, slight oxidation and fatigue are coactively caused the worn of MoSi2. However, those are mainly oxidation, shifting and tearing off of friction layer for MoSi2-SiC composite.关键词：MoSi2;MoSi2-SiC composite;Friction and Wear;In-situ Synthesis
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发布时间：2023-12-18 - 摘要：Compression tests on semi-solid SiCp/AZ61 composites fabricated by the method of stir-casting and isothermal heat treatment were carried using the Thermecmastor-Z dynamic material testing machine. Influences of strain-rate, temperature, and the volume of SiC for the compressive stress were analyzed. The results show that the true stress of semi-solid SiCp/AZ61 composite is sensitive to temperature and strain rate. The true stress is higher with the increasing of the volume of SiC particulate.关键词：Thixotropic compression;Semi-solid;Metal Matrix Composite;particle reinforced phase;SiCp/AZ61
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- 106
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发布时间：2023-12-18 - 摘要：通过向铝液中加入一定比例的KBF4和K2TiF6制备出了TiB2/Al-7Si复合材料,利用XRD,SEM,金相显微镜,硬度（HV）测试和磨损试验等材料分析方法研究了Mg对复合材料的微观组织和力学性能的影响。研究表明,K2TiF6和KBF4混合盐原位反应的生成物为平均尺寸为0.5μm左右的TiB2颗粒。复合材料的硬度和耐磨性随着TiB2含量的增加提高。添加1.5%的Mg改善了TiB2颗粒与铝液界面的润湿性,增加了合金熔体的粘度,阻碍了TiB2颗粒的团聚,明显细化了TiB2颗粒且分布更加均匀,增强了TiB2颗粒的弥散强化和细晶强化效果,复合材料的硬度和耐磨性显著改善。过量的Mg元素（3.0%）会造成TiB2颗粒细化效果的下降,但硬度和耐磨性能继续得到改善,这可能与合金凝固中析出的初晶Mg2Si颗粒和时效过程中析出β′或β″相有关。关键词：TiB2/Al-7Si复合材料;Mg元素;微观组织;硬度;耐磨性能
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发布时间：2023-12-18 - 摘要：Through investigating formation of Al alloy containing TiB2 particles by adding Al-B master alloy to the melt of electrolytic low titanium aluminum,the feasibility of in situ formation of TiB2 was discussed. The experimental results show that the titanium atoms can react with the boron atoms in the melt to form stable TiB2 particles. And the sizes of the TiB2 particles formed in this way are very fine,and also the TiB2 particles uniformly distribute throughout the melt .With the increasing of the amount of TiB2 particles, the TiB2 particles more uniformly distribute in the alloy, and also the HB hardness of the Al alloy is increased significantly.关键词：Electrolytic including-titanium aluminum;In situ;TiB2 particle;HB hardness
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- 146
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发布时间：2023-12-18 - 摘要：In-situ TiC particle reinforced ferrous matrix composites with different contents were fabricated by added Ti metal during melting process of the No. 45 plain carbon steels. The microstructure of composites was analyzed and performance was measured. The results showed that different volume fraction of TiC particle reinforced ferrous matrix composites can be fabricated by using simple melting casting method. The shape of the most TiC in composites was fine and regular triangular or quadrilateral. The TiC quantity increased with the increasing of the Ti addition. As the content of TiC increased to the certain amount, facet dendrite TiC formed. The hardness of composite increased with the increasing of the TiC content. The formation of TiC reduced carbon content in matrix when Ti was only added during material fabrication. It led to Fe3C in the matrix decreasing or disappearing. The macro hardness shows pre-increasing and post-decreasing with the increasing of Ti content. The non-stoichiometric TiCx with carbon lack and the strip Fe2Ti intermetallic compounds formed by the excessive titanium.
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- 154
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发布时间：2023-12-18 - 摘要：In-situ TiC particle reinforced ferrous matrix composites with different Ti contents were fabricated by added Ti metal during melting process of plain carbon steels. Characteristics of abrasive wear were studied on the basis of analysis of microstructure and performance measurements. The result showed that different volume fraction of TiC particle reinforced ferrous matrix composites can be fabricated by using simple melting casting method and the shape of the TiC in the composites shows fine, regular and multilateral. Characteristics of abrasive wear resistance of composites was enhanced by the formation of TiC with high hardness. The performance of abrasive wear resistance of composites was enhanced with the increase of TiC volume fraction. The heavier the load and the more TiC contents, the more excellent wear resistance performance shows in the load from 5 N to 35 N. When adding excessive Ti led to Fe3C disappearing in matrix during the fabrication, the macro hardness of materials was decreased and the wear resistance of composites had been increased. The wear mechanism of composite was mainly to form plough and ditch and form initial grinding chips.关键词：TiC;Steel;Abrasive Wear;Fabricate;Microstructure
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发布时间：2023-12-18 - 摘要：The creep behavior of LD7 aluminum alloy and in situ TiCp/LD7 aluminum matrix composites （15% and 20% volume fraction of TiC particles） was investigated under a condition of constant compressive stress at 523 K, 573K and 623 K, respectively. The results have shown that both the stress exponent and the apparent activation energy of the composite materials were higher than these of LD7 aluminum alloy at 523 K and 573K, indicating that the existence of TiC particles significantly improves the high-temperature creep property of LD7-aluminum alloy.关键词：in situ TiCp/LD7 aluminum matrix composite;Creep Behavior;threshold stress;Activation Energy
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发布时间：2023-12-18 - 摘要：The effect of Al-3P and Al-5Ti-1B master alloys in Mg2Si/Al composite was investigated in this paper. The experimental results show that the Al-P or Al-Ti-B can refine and modify primary Mg2Si, and the refinement and modification efficiency of Al-P master alloy can be improved after the addition of Al-Ti-B. The morphologies of primary Mg2Si particulates change from dendritic to polygonal shape, and their average sizes decrease from 100μm to 20μm.关键词：Al Matrix Composite;Primary Mg2Si;Modification;Al-P;Al-Ti-B
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发布时间：2023-12-18 - 摘要：Taking Mo and Si as a reaction system, a dense MoSi2 was directly prepared. The effect of sintering temperature on microstructures and relative density of MoSi2 were investigated. The microstructure of the product shows that Mo5Si3 distributes at grain boundaries on matrix of MoSi2, with production of small amount of SiO2. With an increase of the sintering temperature, the relative density of the products was improved which may be explained with the effect of the higher degree of liquid phase sintering, while the content of Mo5Si3 increased. A slight excess of Si and control of temperature can help to eliminate the second phase （Mo5Si3）.关键词：Spark Plasma Sintering;MoSi2;Microstructures
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- 109
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发布时间：2023-12-18 - 摘要：Al2O3-（Co,Ni） ceramic matrix composites have been successfully fabricated by combustion synthesis. The principle of chemical composition selection was proposed by thermodynamic calculation in Al-CoO and Al-NiO systems. The samples were synthesized by controlling the strenuous level of combustion reaction, using proper diluents ratio, combustion improver system and polymer addition. In results, the adiabatic temperature of reaction system was deducted by adding diluents. The composites with small metal particles embedded uniformly in ceramic matrix were fabricated by proper reactants designing and reaction controlling technique. The relative density of the samples was improved by pressure densification technique.关键词：Ceramic Matrix Composites;Combustion Synthesis;Composition Designing
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发布时间：2023-12-18 - 摘要：For a high-chromium steel as substrate, WC particles as enhanced particles, joined by steel powder and high-carbon chrome iron powder separately to adjust the composition of Perform layers, using the way of the V-EPC infiltration, which are used to make WC-particle reinforced steel-based metal matrix composites and to research what effect the presetting components on the interface of the composite material. The results show that: the alloy powder particle size of the perform layer will have an impact on the WC particles and matrix interface. The steel powder of 400 meshes ability of molten is better than the high-carbon chrome iron powder of 160200 meshes’, so it’s advantaged for forming matrix interface. Layer of perform steel alloy powder for steel powder, between the composite layer and the matrix was no obvious transition, have micro-cracks; for the high carbon chrome iron powder, composite layer and the substrate transition between the gentle, no micro-cracks and holes.关键词：Vacuum-Evaporative pattern casting（V-EPC）;surface layer composite material;High Chromium Steel;WC particle
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发布时间：2023-12-18 - 摘要：Using the high-chromium steel as substrate prepares WC particles reinforced steel matrix surface 1ayer composites were by V-EPC infiltration. In this study, we control the impact of infiltration, especially the interface in infiltration layer by using different granularity of high carbon-Cr iron powder, and discuss that the effects of alloy powder granularity in perform later on the quality of surface and microstructure. The result shows that with reducing the grain size of alloy powder, the infiltration layer becomes thicker and the quality of surface becomes better. When the grain size of high carbon-Cr iron powder is 200 to 320 meshes, the prepared WC/steel surface composites has intact and flawless infiltration layer, the thickness is 3 mm. The study of microstructure showed that the smaller grain size of high carbon-Cr iron is, the gentler transition zone and more adequate the dissolvability of WC-particle is.关键词：perform layer;steel matrix surface composites;high-carbon chrome iron;Grain Size
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发布时间：2023-12-18 - 摘要：7075/6009 gradient materials were prepared by continuous casting using double-stream-pouring technique. The effects of throttle bore diameter of submerged embedded nozzle on composition, macrostructure and Rockwell hardness of the alloys were investigated. Main attention is paid to the interface characteristics of the alloy ingot. The results show that there is a transition layer about 5 mm in thickness in the alloy ingot. The interface boundary between external layer and transition layer is clear. However, the interface boundary between internal layer and transition layer is difficult to clarify. With the increase in the throttle bore diameter, the thickness of the external layer of the developed alloy increase but the throttle bore diameter has little effect on the thickness of the transition layer.关键词：7075/6009;Gradient Material;Continuous Casting;Interface
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发布时间：2023-12-18 - 摘要：采用SEM、XRD、EDS等手段分析了SiC/A356复合材料工具钢之间的干滑动摩擦磨损特性及磨损机制。结果表明,各种热处理对复合材料干滑动摩擦条件下的耐磨性的影响较小,呈现出相似的磨损规律和磨损机制。在干滑动摩擦磨损中,对偶材料的磨屑通过塑性变形混入到复合材料内部,在磨损面上形成机械混合层,其厚度呈现随附加载荷的增加而加大的趋势;混合层中容易发生裂纹的形成与扩展,从而造成剥离磨损。总的磨损机制为低载荷下以氧化磨损为主,形成细小粉末状磨屑,随着载荷的增加,由机械混合层形成的板片状剥离磨损磨屑为主要磨损机制,同时存在氧化磨损和粘着磨损,当载荷载荷增加到350450N时,磨损以形成不规则形态磨屑的粘着磨损及剥离磨损磨屑为主要的磨损机制,并使磨损率急剧增加。关键词：复合材料;SiC/A356;干摩擦;磨损机制;磨损特性
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发布时间：2023-12-18 - 摘要：The composites （α-Al2O3+ ZrB2）/Al fabricated by microwave exothermic dispersion （MXD） method in Al-ZrO2-B system were investigated. The MXD synthesis process has lasted for about 6 min and which is harmonious with environment When the x（B）/x（ZrO2） is zero, the reinforcements of the composites are composed of α-Al2O3 and Al3Zr, which are of fine grains and blocks respectively. When the x（B）/x（ZrO2） increases, the amount of Al3Zr phase decreases. When the x（B）/x（ZrO2） reaches 2, the Al3Zr phase almost eliminates and the reinforcements of the composite are made up of α-Al2O3 and ZrB2 which are good distribution in the aluminum matrix.关键词：microwave exothermic dispersion reaction;Aluminum Matrix Composites;Reaction Mechanism
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发布时间：2023-12-18 - 摘要：研究了处理剂对锌铝硅复合材料力学性能的影响。结果表明,镁铝合金中加入适量的处理剂后能有效地提高合金的硬度、冲击韧度等力学性能,但如果加入过量的处理剂后,合金的力学性能反而会降低。关键词：锌铝硅合金;力学性能;处理剂
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发布时间：2023-12-18 - 摘要：In light of foundational and applied areas of rheoforming, three fields, which included efficient preparation of sound semi-solid slurry, formation mechanism of semi-solid microstructure, and direct forming techniques of semi-solid slurry and heat treatment strengthening of castings, were overviewed and discussed. We hope our researches may contribute to the industrial application of rheoforming in China.关键词：LSPSF;Rheoforming;Semi-solid Slurry;Mechanical Properties;Microstructure Simulation
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发布时间：2023-12-18 - 摘要：The technology of preparation of semisolid slurry of metals by ultrasonic vibration has been studied, including the processing parameters, formation mechanism of non-dendritic crystals, and microstructure of special semi-solid aluminum alloys. Results show that direct ultrasonic vibration on molten melt could make out semi-solid slurry with tiny crystals in a very short time, and this method had the characteristics of simple equipment, short flow, easy maintenance and good stirring effect. By this process the primary Si phase in hyper-eutectic Al-Si alloy A390 could be minimized to about 20 μm; and the primary non-dendritc α-Al crystals in hypoeutectic Al-Si alloy 356 were small and near spherical.关键词：Ultrasonic Vibration;Semi-solid;Aluminum Alloy;Rheocasting
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发布时间：2023-12-18 - 摘要：The semi-solid AlSi7Mg alloy slurry with larger capacity was prepared by the compound technology of low superheat pouring and week traveling-wave electromagnetic stirring in this paper. The effects of electromagnetic stirring power and frequency on the shape and distribution of the primary α-Al grains of the semi-solid AlSi7Mg alloy slurry with larger capacity were discussed. The experimental results show that an ideal microstructure of the AlSi7Mg alloy slurry prepared by the compound technology of the low superheat pouring and week traveling-wave electromagnetic stirring can be obtained. When the pouring temperature is 630℃,the electromagnetic stirring power is 1.52 kW, the electromagnetic stirring frequency is 5 Hz, and the stirring time is 8 s ,the slurry with larger capacity, containing finer and more spherical primary α-Al grains distributed homogeneously can be obtained .At the condition of the low superheat pouring and week traveling-wave electromagnetic stirring, the pouring temperature is 630 ℃, the electromagnetic stirring frequency is 5 Hz, appropriately raising the stirring power can gain a better shape of the primary α-Al grains ,but if the stirring power is increased to a certain value（1.52 kw）, the shape of the primary α-Al grains can not be obviously improved and spherical primary α-Al grains distributed homogeneously can be obtained, the optimized processing parameter is 1.52 kW. At the condition of the low superheat pouring and week traveling-wave electromagnetic stirring, the pouring temperature is 630 ℃ and the electromagnetic stirring power is 1.27 KW, appropriately raising the electromagnetic stirring frequency can gain a better shape of the primary α-Al grains ,but if the electromagnetic stirring frequency is increased to a certain value（10 Hz）, the shape of the primary α-Al grains can not be obviously improved and spherical primary α-Al grains distributed homogeneously can be obtained.
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发布时间：2023-12-18 - 摘要：Heat and mass transfers during the Vibrating Wavelike Sloping Plate process （VWSP） were studied by the methods of numerical simulation and experiment. The results show that during the VWSP process, the heat of the melt diffuses along the normal line to the sloping plate surface in the macroscopic scale, and the isothermal line gradually deviates from the sloping plate surface to the interface between the melt and the air. Micro mass point dissipates heat homogenously along very directions on the surface, which promotes eruptive nucleation and provides important preconditions for fine spherical grain formation. Vibration and metal flow greatly improve solute diffusion coefficient and accelerate the solute diffusion in the liquid phase, which leads to homogenous solute distribution and provides preconditions for eruptive nucleation and spherical growth.关键词：Wavelike sloping plate;Semisolid;Heat Transfer;Mass transfer;Microstructure
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发布时间：2023-12-18 - 摘要：The effect of casting velocity on the microstructure morphology of semi-solid billets of ZL116 alloy, cast by near-liquidus semi-continuous casting, was studied. The results showed that the semi-solid billets of ZL116 alloy with the homogeneous and fine rosette-shaped microstructures could be cast from 150 mm/min to 200 mm/min by the near-liquidus semi-continuous casing process.关键词：Near-Liquidus Semi-Continuous Casting;ZL116 alloy;casting velocity;microstructures for semi-solid state
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发布时间：2023-12-18 - 摘要：Semi-solid isothermal heat treatment is thought to be a potential method for the manufacturing of magnesium alloys slurry with nondendritic structure. The present work investigates the microstructure and the compression deformation behaviour of AZ91D magnesium alloy following semi-solid isothermal heat treatment. The research results indicate that, after treated at 570 ℃ for 60 min, the dendritic structure of AZ91D alloy becomes unobvious. In addition, with the compression strain increasing the semi-solid compression stress of AZ91D alloy treated at 570 ℃ for 60 min rapidly reaches a maximium value when the compression strain is about 0.025, then the compression stress gradually decreases and finally kept a constant stress level. Furthermore, with the deformation temperature or rate increasing, the semi-solid compression stress of AZ91D alloy treated at 57 0℃ for 60 min decreases and increases, respectively.关键词：Semi-solid isothermal treatment;AZ91D alloy;nondendritic structure;semi-solid compression
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发布时间：2023-12-18 - 摘要：Evolution on morphology of primary phase in semi-solid ZL101 Al alloy during isothermal holding in the solid-liquid area is investigated and the effect of processing parameters on the morphology is discussed. The results indicate that the morphology and grain size gradually become better and finer with the holding temperature decreasing under the different holding temperature. The morphology gradually comes into better and the grain size is still finer with prolonging of holding time at the same holding temperature but different holding time. Pouring temperature has the bigger effect on the morphology and the evolution of primary phase at the isothermal holding. The suitable processing parameters prepared semi-solid ZL101 Al alloy slurry are obtained.关键词：Semi-solid;ZL101 Al alloy;Morphology;Isothermal Holding;Primary Phase
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发布时间：2023-12-18 - 摘要：In this paper, an Al-Fe alloy chemical composition has been designed; semi-solid forming technology has been used to prepare the alloy. The microstructure of the alloy as cast, electromagnetic stirred and semi-solid formation state has been analyzed and the mechanical properties of the alloy have been tested. The results show that microstructure of the alloy becomes obviously thinner after the alloying and electromagnetic stirring, semi-solid formation processing makes the microstructure further refined. The length and thickness of the second phase decrease; at the same time, the acute angles disappear, and their distributions also become more homogeneous. The tensile strength of the alloy increases about 79.7% compared with the alloy at cast condition.关键词：Semi-solid formation;Al-Fe-based alloy;Microstructure;Tensile strength
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- 139
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发布时间：2023-12-18 - 摘要：随着压铸生产技术和管理要求的提高,实现对生产现场的远程监控已势在必行。由于生产现场监控设备种类比较多,而OPC接口的出现,解决了应用软件和各种设备驱动程序间的通讯。主要介绍了通过OPC和工业以太网对主要生产控制设备PLC（可编程序控制器）的实时远程监控。通过采用以上新技术,优化了压铸工艺,提高了铸件质量及生产效率。关键词：OPC;PLC;工业以太网;Controller Link网;组态王;压铸;远程监控
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发布时间：2023-12-18 - 摘要：The liquid combination process of die casting and forging is a new forming method which combines processing property of die casting with that of forging. Under the condition of the same process parameter and with the help of orthogonal test, AZ91D magnesium test samples were produced by the combination process of die casting and forging and the common die casting, respectively T6 method was also employed to treat the test samples. And then, the macroscopic defect of samples was analyzed, the mechanical property of samples was tested respectively. It was indicated that, the macroscopic defect of the test samples produced by the liquid combination process of die and forging was improved greatly. Under the condition of the same process parameter, the tensile strength and extensibility of the test samples produced by the liquid combination process of die and forging, were increased by 84.394% and 101.761% respectively, the tensile strength and extensibility of the test samples treated by T6 were increased by 94.672% and 121.617% respectively.关键词：AZ91D Magnesium Alloy;Combination Process of Die Casting and Forging;Die Casting;microscopic defect;Mechanical Property
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发布时间：2023-12-18 - 摘要：The dry sliding friction and wear characteristics of magnesium alloy AZ91D,which were formed by rheo-diecasting and die casting process, were studied at different load、rotate speed and wear time by using an MM-200 abrasion tester. The results show that the wear rate and friction coefficient of magnesium alloy formed by rheo-diecasting process are higher than that of magnesium alloy formed by die casting process in the same expeiment condition. The wear rate and friction coefficient of magnesium alloy enhance with raising the load, and the wear loss mass reduces instead when the load arrives at 250 N. The wear loss of Mg alloy enhances in linearity proportion with the load, but the friction coefficient of Mg alloy do not changed apparently. With increaseing the rotating speed, the weight loss of the alloy can be increased and the friction coefficient can be decreased.关键词：liquid die casting;Rheo-diecasting;Magnesium Alloy;Friction and Wear
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发布时间：2023-12-18 - 摘要：通过对机油滤清器支架产品的结构特点及使用条件的分析,在压铸模具设计及压铸工艺调整上采用了一系列行之有效的办法,解决了产品热结部位气孔和缩孔及产品出型困难等技术难题,并探索出一整套生产该件的最佳压铸工艺参数,使产品达到甚至超过客户质量标准要求,满足了客户的生产所需。关键词：热节;气孔;缩孔;缩裂;孔隙率
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发布时间：2023-12-18 - 摘要：Based on analysis of the skin microstructure of obtained samples from a plate die casting, three characteristics of skin microstructure including thick and fine grained chilling microstructure, a small number of chilling microstructure and no chilling microstructure totally, were observed. With the numerical simulation of filling and solidification process for the plate die casting, the formation of different characteristics was discussed. The research indicated that the mode of collision between filling liquid and die surface as well as the solidification order had important effect on the skin microstructure formation.关键词：Die Casting;Skin Microstructure;Numerical Simulation;Heat Transfer
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发布时间：2023-12-18 - 摘要：以压铸铝、镁及其合金用优质H13钢为对象,进行了相关热处理工艺研究和拉伸、硬度及冲击性能检测。研究结果表明,优质H13钢二次硬化温度比常用H13钢高5070℃,经1100℃淬火、600℃二次回火后,试样表现为较优的强韧性配合和综合使用性能。关键词：压铸;模具;H13钢;热处理
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- 333
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发布时间：2023-12-18 - 摘要：The joined technique of dollop-like mischmetal and extruded Mg-mischmetal intermediate alloy in die casting Magnesium alloy AZ91D was investigated. Mischmetal absorptivity in Mg alloys was calculated. The results showed that the absorptivity of mischmetal achieved less than 50% within 30 min when mischmetal was added by dollop-like under conventional cold chamber die casting condition because the melting point of rare earth element exceeded the remelting temperature of die casting magnesium. The Mg-MM intermediate alloy was prepared by permanent mold casting and then was extruded into the bars. The microstructure and analytical studies were carried out using optical microscopy and differential scanning calorimetry （DSC）. Testing results shows the Mg-MM intermediate alloy could melt easily down at die casting temperature for RE containing Mg phase with lower melting point was formed and the mischmetal absorptivity was around 95% in laboratory. Then magnesium alloy test bars were produced under conventional cold chamber die casting condition with addition of extruded Mg-MM intermediate alloy and the mischmetal absorptivity was around 80%. Observation and analysis indicated that the microstructures of the alloy were refined and RE containing Al phase was formed.关键词：Magnesium Alloy;Rare Earths;Die Casting;Joined Technique;Absorptivity
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发布时间：2023-12-18 - 摘要：The compression casting experiments has been done with two different ingredients magnesium alloys in this paper. The metallurgical structure and tensile fracture pattern of the pressure castings were investigated; also the room temperature and elevated temperature mechanical properties of samples were tested. The results indicate that a little rare earth has small effect on the room temperature mechanical properties of the alloys which lied on the amount of shrinkage porosity and impurity in the matrix, but the rare earth obvious improved the elevated temperature properties of the alloys. The tensile fracture patterns of samples mainly were brittle fracture as cleavage fracture at room temperature. When 150℃, the quantity of dimple and tearing arris were visibly increased on the fractures, and the tensile fracture patterns exhibited hybrid fracture as ductile rupture.关键词：Magnesium Alloys;Rare Earth;Die Casting;elevated temperature property
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发布时间：2023-12-18 - 摘要：利用CAD分别建立了不同运动类型挤压铸造模具的装配模型;运用Flash和3DMax两个软件强大的仿真功能对挤压铸造模具进行运动仿真,模拟了模具开模、合模及卸料等运动过程,在仿真过程中实时观察模具各部件运动情况。结果表明,通过对模具运动仿真,能真实而直观地再现了模具工作过程。发现模具的早期设计问题以及时进行修正和改进,以保证模具结构的准确性与合理性,有效提高了设计效率,降低了设计成本。关键词：挤压铸造;模具;运动仿真
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发布时间：2023-12-18 - 摘要：Aluminium alloy swashplate is a key part of the swashplate compressor of air conditionor for car, which is fabricated by hot forging. Recently a novel method, which can be used to replace hot forging process due to high price, is hope to be developed. Accoding to the requirements of materials, properties and machine method of swashplate, three different processes were developed for making swashplate of aluminum alloys. Comparison of defects such as air bubble after heat treatment, slag etc, process operations and production efficiency, an indirect squeeze casting with pressurization and local pressurization method is decided. The character of of the novel process is high and production efficiency. is up to 84%, production rate is more than 50 pieces per hour and qualified rate of swashpalte is over 85% in the case of mass production.关键词：Squeeze Casting;Aluminum Alloy;Compressor of Air-conditionor;Swashplate;Car
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- 131
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发布时间：2023-12-18 - 摘要：Some research are carried out on the mechanical property and structure of wrought aluminum alloy through rheocasting using the technique of liquid forging taking the 7075 aluminum alloy as an example,. It mainly discussed the possibility of rheocasting the wrought aluminum alloy. Dense parts without flaws such as micro gas holes and micro shrinkage cavities were produced using cooling-slope to get semi-solid slurry directly and advanced liquid forging technique under three pressure levels（80 MPa,87 MPa,95 MPa） . The obtained parts had a high tensile strength at maximum of 502 MPa after the heat treatment, which is much higher than the average level of normal metal mold casting and approaching to the wrought standards and the tensile strength does not go up along with the pressure levels. The tensile strength of 7075 aluminum alloy by rheocasting through different heat treatments was not obvious but different aging treatments play an very important role in elongation of 7075 wrought aluminum alloy.关键词：Rheocasting;squeeze casting, 7075wrought aluminum alloy;Liquid Forging;Mechanical Properties
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- 488
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发布时间：2023-12-18 - 摘要：Microstructure and mechanical properties of solution heat-treated Al-5.5%Si-4%Cu alloy with different applied solidification pressures have been investigated. With the pressures applied during solidification, the microstructure of the alloy has shown significant change, and both tensile strength and elongation of the alloy were improved remarkably. As the squeeze pressure increase in the range from 0.1 MPa to 50 MP, size of primary α-Al was decreased evidently and morphology of eutectic Si particles was changed from long acicular to small granular, and the dendrite arm spacing, content of Al2Cu phase and porosities between dendrites were decreased while the mechanical properties increase. When the applied pressures changed from 50 MPa to 100 MPa, the microstructure and mechanical properties of the investigated alloy have been shown little variation. It is indicated that 50 MPa is a proper squeeze pressure of the investigated alloy whose tensile strength and elongation reached up to 323.6 MPa and 8.51%, respectively, at the applied pressure after solution heat treatment.关键词：Al-Si-Cu Alloy;Squeeze Casting;Mechanical Property;Microstructure
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发布时间：2023-12-18 - 摘要：Two types of 50vol%B4Cp/2024Al composites with the particle size of 25 μm and 50 μm were prepared by squeeze casting. The density, hardness, flexural strength, quasi-static compressive strength, KIC of composites was tested, and the dynamic compressive strength under high strain rate load was examined by Split Hopkinson Pressure Bar system. The results show that: The density of 50vol%B4Cp/2024Al composite is 2.7 g/cm3, and the hardness is 60 HRA; When the size of B4C particles is 25 μm, the composite’s flexural strength is 527 MPa, KIC is 13.56 MPa·m1/2 and the quasi-static compressive strength is 797.5 MPa, distinctly higher than that of the composite with particle size of 50μm. In addition, the dynamic compressive strength of fine-particle reinforced composite is relatively higher than that coarse-particle reinforced one. Strain dependent damage evolution leads to the strain softening, and rate dependent damage evolution caused the insensibility of strain rate or even negative strain rate effect.关键词：Squeeze Casting;Metal Matrix Composites;Mechanical Properties;high strain rate;size effect
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发布时间：2023-12-18 - 摘要：采用传统低压铸造铝合金车轮,存在着轮盘处过热,深轮辋铝液充型倒流和保温炉铝液品质欠稳定等问题点,笔者提出了相应对策,与读者探讨。关键词：过热;充型倒流;重复一致性;多道浇口;活性熔剂;吸附
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发布时间：2023-12-18 - 摘要：针对平均壁厚为6mm而壁厚差较大的低压大型铸件生产过程中存在的缩松缺陷进行了分析,采用改进铸造工艺促使铸件实现顺序凝固,在易出现缺陷处采取激冷、增加冷铁等办法,解决了低压铸造大型铝合金件高压电器基座生产过程中出现的缩松问题,提高了产品品质。为大型壁厚不均铸件的低压铸造生产提供了可借鉴的有效途径。关键词：低压铸造;壁厚不均;缩松;激冷;顺序凝固
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- 150
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发布时间：2023-12-18 - 摘要：Has studied the multi-aging Process on a number of low-pressure die-casting of A356 aluminum alloy wheels mechanical properties affected. The results indicated that the multi-ageing alloy the tensile strength, the yield strength, degree of hardness to improve; The elongation ratio drops; And increases the change scope along with the ageing times in the drop, the organizational structure tends to become more stable. A356.2 aluminum alloy grain thickness, after the T6 heat treatment to yield strength and degree of hardness no influence, but the tensile strength and the elongation ratio drop. The research believed that the multi-ageing can cause A356.2 aluminum alloy wheel intensity and hardness enhance, but the ductility drops, and causes the performance to be stabled. In A356.2 aluminum alloy casting process the grain thick its ductility is worse.关键词：A356.2 aluminum alloy;Wheels;many aging;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effect of casting defect for quality of Aluminum alloy motorcycle shock absorber cylinder was analyzed. Several representative casting technologies were compared. In order to ensure quality of the casting, relevant requests on melting of Aluminum liquid, casting technology and the operating process were put forward. These measures have been validated in production practice.关键词：Aluminum Alloy;Shock absorber;Permanent Mold;Casting Technology
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- 96
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发布时间：2023-12-18 - 摘要：A novel process named local pressurization in the die casting was successfully used to deliminate shrinkage porosity at the thick section of the die castings recently. A movable local pressurization apparatus was fabricated and adopted to cast die castings on an industrial scale in the paper, which owns the following merits such as simple constructure, cheap and adjustable parameters. The effects of the pin style and the tolerance between and hole on the life span of pin were investigated. The optimized tolerance for the pin of d 8mm and 12mm diameter was attached and the life span of the pin was guaranteed. The influence of local pressurization parameters on the inner porosity at the castings was analyzed again. The results showed that bigger pressure from pin, less porosity. The pressurization effect is better when the local pressurization timing is earlier. The ratio of the castings without shrinkage porosity defect is more than 97% after local pressurization was adopted in the plant.关键词：Die Casting;Local Pressurization;Al Alloy;Shrinkage Porosity
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- 136
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发布时间：2023-12-18 - 摘要：High vacuum die casting process is a novel technology, which are mainly used to make automobiles parts due to lightweight trends. Key technologies including shut-off valve, vacuum system, sealing structure of die, release agent and gating system are investigated based on the MFT process（Minimum Filling Time） in the paper. Microstructure and properties of ZL101 were analyzed in the high vacuum die casting process. The results demonstrated that the developed high vacuum die casting process can meet the needs of the products. There are no bubbles occurred on the surface of specimen after being T6 heat-treated. Compared to general die castings, tensile strength of ZL101 alloy castings is up to t 204.55MPa and their elongation to 8.41%, and are increased by 17.16% and by 71.98%. However tensile strength was enhanced by 7.68% while their elongation was weakened by 6.78% after heat treatment.关键词：High Vacuum Die Casting;Al-Si-Mg alloys;Strength;Ductility;Microstructure
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- 364
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发布时间：2023-12-18 - 摘要：The vacuum shut-off valve and vacuum system for high vacuum die-casting were developed in this paper. The shut-off valve shares the existed structure that has an initiative piston and a driven piston. However, the lever was used as a transmission between initiative and driven piston, different with the other structures existed. The test demonstrated that the vacuum shut-off valve is simple and more flexible and reliable. High vacuum of the cavity can be attached within 1s through the designed vacuum system. The experimental results showed that there are no bubbles on the surface of the specimen after T6 heat treatment when developed shut-off valve and vacuum system was adopted to the high vacuum die casting process.关键词：High Vacuum Die Casting;vacuum shut-off valve;Vacuum System;high strength and toughness die castings
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- 394
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发布时间：2023-12-18 - 摘要：Booster vacuum casting is an advanced technique developed on the basis of traditional casting,its principles can be summed up as vacuum-pouring and solidification pressure, The paper is the use of vacuum booster technology ,producing weight of about 60 kg, size of 1200×600mm and 2-20 mm wall thickness of the aluminum alloy large complex castings-electronic ark（ZL101）.By the casting analysis and production practice, designing reasonable technics parameter: Smelting between 720℃ and 730℃, the degree of vacuum-pouring is -0.0975MPa, and the solidification pressure of 0.4-0.7MP, There is no shrinkage, no pinholes on the large complex aluminum alloy casting surface,by using X-ray. Casting structure is thickening and the eutectic structure tiny ,under the microscope. Its tensile strength would attain 245MP and elongation percentage 4.5%.关键词：Booster vacuum casting;thin-walled complex;Aluminum Alloy;electronic cabinet
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发布时间：2023-12-18 - 摘要：The use of oil well sucker rod pumping unit for oil extraction is so common all over the world. The YCCH Ultra High Slip Motor is specifically designed to drive it for optimum performance and convenience and its rotor has special type of the leads. If we make use of die-casting equipment、and technique ordinarily, the waste products rate can reach 30%. The waste products rate can be below 0.5% after ameliorating the die-casting equipment and suitable dies, assorting the technique.关键词：YCCH Ultra High Slip Motor;rotor;rack leads of the rotor;stave padding of the rotor
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发布时间：2023-12-18 - 摘要：In the article, development and application of investment casting technology for titanium alloys castings have been introduced from molding technology ,casting technoogy and quality controling. And the application of Titanium investment castings in aerial and aerospace, weapons, chemical Devices,etc. have been summarized too. At last, the developing vista and market demands are estimated.关键词：Titanium;Investment casitng;Molding technology;Shaping technology;Application
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- 706
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发布时间：2023-12-18 - 摘要：The causes of casting defects which happened in stainless steel investment casting practice have been analyzed in this paper, such as pockmark, black point, indentation, shrinkage depression, and so on. On base of these, the key sections of quality control on investment casting have been put forward.关键词：Investment Casting;Casting Defects;Quality Control
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发布时间：2023-12-18 - 摘要：Two kinds of composite mode casting procession have been introduced in this paper, there are loss wax mode in combination with permanent mode, resin sand mode in combination with lost wax mode. According to the structure and requirements of complex aluminum casting, special part of the casting could be made by different mode, which is availability to its forming process and solidification structure controlling.
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发布时间：2023-12-18 - 摘要：分析当前国内精密铸造业的发展方向,并对现行精密铸造生产的制壳工艺优缺点进行比较,提出一种新型节能精密铸造粘接剂-ZF-801型快干硅溶胶。通过分析ZF-801型快干硅溶胶型壳的制壳时间、铸件尺寸精度、表面质量、常温强度、高温强度、残留强度等方面的优异表现,从而得出ZF-801型快干硅溶胶是符合较少污染物排放要求,且成本适中的新一代精密铸造制壳专用粘结剂。关键词：快干硅溶胶;节能;精密铸造;制壳工艺
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发布时间：2023-12-18 - 摘要：The aim of this paper is to study the reaction between TiNi alloy and a new kind of Boron nitride based shell mold used for investment casting titanium alloys, and the formation mechanisms of the reaction layer between Ti-Ni alloy and BN based shell mold is also discussed. The results show that the reaction is slight and the thickness of the reacting layer is only about several micrometers. The new kind of Boron nitride base shell mold will substitute for the traditional investment mould of the casting titanium alloys such as Y2O3 or ZrO2 based shell mold at a lower casting temperature.关键词：TiNi Alloy;Boron nitride;interface reaction;investment casting shell mold used for titanium alloys
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发布时间：2023-12-18 - 摘要：The solidification microstructure of Fe-49%Sn and Cu-40wt%Pb monotectic alloys was investigated under a high magnetic field. The results show that some of aligned solidification structure were formed in the alloy of Fe-49%Sn and Cu-40wt%Pb under high magnetic field. In Fe-49%Sn alloy with 10T high magnetic field, the difference of magnetic anisotropy energy in αFe crystal orientations and the preferential growth of αFe dendrites induce the formation of aligned Fe-rich dendrite phase paralleled to the applied high magnetic field, and the diffraction intensity in αFe （110） crystal face is apparently increased. In Cu-40wt%Pb alloy with 12 T high magnetic field, the motion of Pb-rich droplets and the melt flow in the solidifying front was restricted by high magnetic field, that induce the formation of much longer, regularly aligned rod-like Pb-rich phase in the sample center.关键词：Monotectic Alloy;Solidification;High Magnetic Field;Cu-Pb;Fe-Sn.
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发布时间：2023-12-18 - 摘要：A comprehensive mathematical model has been developed to describe the interaction of the multiple physics fields during the conventional DC casting and LFEC （low frequency electromagnetic casting） process. The model is based on a combination of the commercial finite element package ANSYS and the commercial finite volume package FLUENT, with the former for the calculation of the electromagnetic field and the latter for the calculation of the magnetic driven fluid flow, heat transfer and solidification. Moreover, the model has been verified against the temperature measurements obtained from two 7XXX aluminum alloy billets of 200mm diameter, cast during the conventional DC casting and the LFEC casting processes. In addition, a measurement of the sump shape of the billets were carried out by using addition melting metal of Al-30%Cu alloy into the billets during casting process. There was a good agreement between the calculated results and the measured results. Further, comparison of the calculated results during the LFEC process with that during the conventional DC casting process indicated that velocity patterns, temperature profiles and the sump depth are strongly modified by the application of a low frequency electromagnetic field during the DC casting.
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发布时间：2023-12-18 - 摘要：The influence of processing history on microstructure and magnetic properties of Fe-49%Sn monotectic alloys under 5T high magnetic field have been investigated. The results showed that the cooling rates had little effect on microstructure and magnetic properties as it is slow. However, the Fe-rich phases were obviously coarsened when prolonging holding times under high magnetic field and then its magnetic properties were induced to enhance. Theoretical analysis showed that the solute diffusion in Fe-rich dendrite phases were accelerated, and the dendrite was coarsened when prolonging holding times under high magnetic field. moreover the magnetic anisotropy energy of Fe-49%Sn alloys was induced to increase, so that the magnetic permeability enhances. However, in these experiments, the weak cooling rate has a little effect on the microstructure and magnetic anisotropy energy, so its variety of magnetic permeability is small.关键词：High Magnetic Field;Fe-Sn;Monotectic Alloy;Microstructure;Magnetic Property
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发布时间：2023-12-18 - 摘要：采用分子动力学方法,研究了不同过冷度下Cu4Ni6二元合金均质形核的微观过程,确定了临界晶核的大小与结构。结果表明,在形核初期,体系中会出现大量不稳定的晶胚,通过结构起伏和成分选择,最终形成稳定晶核。晶核近似具有原始合金的成分。晶核由大量FCC结构原子和少量HCP结构原子组成。两种原子各自呈层状排列。正二十面体结构不参与合金的实际形核过程。随着过冷度的增加,晶核大小逐渐降低,但形核开始时间呈先减少后增加的趋势。关键词：分子动力学;原子团簇;均质形核
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发布时间：2023-12-18 - 摘要：Primordial technology for rudder horn steel castings of large ship has been designed according to the experiences of technological designer and simulated by using HUA ZHU CAE software. Based on the computer simulation,the design of the castings has been optimized by analyzing the simulation result. the result shows that the riser、chill and gating are allocated reasonably, and castings direct solidification can be ensured. Therefore the rudder horn steel casting could be produced according to classification of vessel standard.关键词：rudder horn casting;foundry technology design;computer simulation and optimization;practical production
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发布时间：2023-12-18 - 摘要：The microstructural evolution of Al-Cu alloy in semi-continuous castings was simulated by using multi-scale calculation method. A new method for semisolid alloy design is proposed on the basis of microstructural simulation. The theoretical models of temperature field and phase transformation were established with respect to the continuous casting process. The solid fraction was used to couple the models for macro-scale and mesoscale calculations. A method of treating the non-physical boundary was proposed for the castings at the outlet side of the tools, witch is effective and of high precision for the steady casting process. The influence of concentration, pouring temperature and casting velocity on the microstructures of Al-Cu alloy was simulated using multi-scale simulation technique. It is shown that grains grow dendritically and meet with their neighbours to form high concentration boundaries. The influence of pouring temperature and the casting velocity on the microstructures become small when the concentration of Cu reaches 8wt%, which favors the formation of desired structure in semisolid alloys. The simulated result for ZL201 alloy is well consistent with the experimental. This work demonstrates that the multi-scale simulation is an effective method to the semisolid alloy design and the prediction of the processing parameters.关键词：Multi-scale Simulation;semisolid forming;near liquidus casting;Liquid/solid Phase Transformation
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发布时间：2023-12-18 -
The Application Research of Foundry CAE Technology on the Optimization of Investment Casting Process
摘要：A set of technology program of Investment casting process was established on the characteristics of complex steel castings, and the reasonableness of the process scheme was analysis by finite element analysis technology. The results showed that within the castings there were two regions easily to produce shrinkage defects, based on the numerical results the solidification process of metal liquid was analyzed, the causes of the defects was identified by the results of the analysis. After optimizing the preliminary process scheme the re-calculated results showed that the internal shrinkage of castings has been eliminated, and a research on the two process schemes have been doing too. The test results agree well with the simulation results.关键词：Numerical Simulation;Investment Casting;Process Optimization;experimental study- 2
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发布时间：2023-12-18 - 摘要：This paper established the thermal field model and phase transformation model for near-liquidus casting process. The solid fraction was used to couple the macroscale and mesoscale calculations. The evolution of the morphology of primary phase of 6061 alloys was simulated and experimentally studied under different conditions, e.g. pouring temperature, casting velocity, cooling intensity etc. The results show that the pouring temperature has the largest effect on the morphology of primary phase. When isothermally holding a while and then pouring near the liquidus, the morphology of primary phase is ideal globular. It is shown that the desired semisolid structure of 6061 alloy can be obtained under the conditions of 940K pouring temperature, 0.05 m3/min cooling intensity and 0.002 m/s casting velocity.关键词：semisolid metal forming;near liquidus casting;6061Alloy;multiscale simulation
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发布时间：2023-12-18 - 摘要：Water based releasing agent is necessary in Al-alloy and Zn-alloy die casting. The die releasing agent spraying technologies have important effects on die casting quality and die life. On the basis of the description of die releasing agent spraying process, the temperature and temperature gradient of die surface were analyzed by means of FEA method. The analysis results showed that the die surface temperature decreased zigzag in pulse spraying with lower temperature gradient. These would be beneficial for die life prolonging.关键词：Die Releasing Agent;Spraying Technology;Temperature Distribution;Temperature Gradient;FEA
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发布时间：2023-12-18 - 摘要：开发了模拟铝合金挤压铸造凝固过程铸件温度、应力及形状变化过程的有限元模型。该模型包括了凝固过程的潜热释放和体积收缩效应、传热和变形通过界面气隙的相互作用、以及凝固壳在冲头压力作用下的变形过程等。应力场模拟中采用热弹粘塑性本构模型来描述凝固壳的变形,并对液相/糊状区进行了特殊处理。利用接触算法处理铸件与模具界面,并且采用一种特殊的迭代法来模拟冲头的运动。该模型可以用来研究模具设计、工艺参数（如浇注温度、冲头压力、加压时间等）对铸件质量的影响。关键词：挤压铸造;热-力耦合;有限元方法;本构模型
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发布时间：2023-12-18 - 摘要：The temperature field during soft-contact electromagnetic casting of round duraluminium alloy billets is numerically simulated. The influences of induction heat, withdrawal rate, ampere winding, the thickness of crystallizer wall, the number of slits and the frequency on the temperature distribution are discussed in detail. The simulation results indicate that the temperature pattern of melt is very sensitive to the withdrawal rate and symmetrical in the presence of the electromagnetic field. The reduction of average temperature reduces about 30 K when the withdrawal rate increases 0.01 m/s. The average temperature of melt increases with the increase of ampere windings. The average temperature of melt heightens about 1.6 K when the thickness of mould wall reduces 1mm and 0.2 K when the number of slits of mould increases one. The influence of the frequency on the temperature pattern is not obvious.关键词：Numerical Simulation;Soft-contact;Electromagnetic Casting;Duraluminium alloy
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发布时间：2023-12-18 - 摘要：Based on electromagnetism theory, the three dimensional magnetic field in rectangular soft-contacting electromagnetic continuous casting （EMCC） mould is numerically investigated through ANSYS software. The results show that the overlap of electromagnetic flux appears distinctly at the corner of rectangular soft-contact mold; The largest magnetic intensity can be obtained while the free surface of liquid duraluminium alloy locating at the center of induction coil; A prime magnetic intensity can be attained with a 5 mm to 10 mm distance between induction coil and fire-resistant material; Stainless mould can obtain 1.5-2 times magnetic intensity more larger than 5052 aluminum mould.关键词：Duraluminium alloy;Numerical Simulation;Electromagnetic Casting;Soft-contact mold
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发布时间：2023-12-18 - 摘要：A round mould is designed for the soft contacting electromagnetic casting duraluminium alloys. The influences of different structure schemes of mould on the magnetic penetrating performance are studied by numerical simulation. As well, the effects of mould thickness, the number, height and width of the slits are numerically studied. The work is helpful for optimizing the mould design.关键词：Numerical Simulation;Mould;Electromagnetic Casting;Duraluminium alloy
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发布时间：2023-12-18 - 摘要：Finite element simulation of the effects of friction on the equal channel angular pressing for high-strength aluminum alloy was conducted by using DEFORM-3D program. The results show that the work load ascended with the increasing of the friction coefficient. When the constant increased from 0 to 0.3, the maxium load increased by 2.1 times. One part of load overcome the friction and the other part is used for deformation of the sample. Therefore the energy is wasted, and mold life was reduced on the condition of friction. In addition, with the increasement of friction coefficient, the average effective strain keep steady value, and the degree of effective strain uniformatiy at the inner of the sample decreased. As mentioned above, in the course of ECAP deformation, the inner wall of the mold should keep slippy and the appropriate lubricant is choosed to decrease the friction and the load, then grian refinement and microsturcture uniformity will be improved.关键词：Friction;High-strength Aluminum Alloy;equal channel angular pressing（ECAP）;Finite Element Simulation
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发布时间：2023-12-18 - 摘要：A model was developed for analyzing system power of electromagnetic soft-contact continuous casting system. Using finite element method, the system power and magnetic flux density distribution were calculated, and the effect of coil current and frequency on system power and magnetic flux density distribution were also discussed. The results show that as for electromagnetic soft-contact continuous casting system with partial-segment type mold, about 59%-65% of electric power is dissipated in the mold, and the maximum magnetic flux density on billet outer surface is located 5.5mm below metal free surface. The magnetic flux density is proportional to coil current, and is reduced with frequency increasing from 10 kHz to 100 kHz. The coil current has no effect on the azimuthal homogeneity of magnetic flux density, but the magnetic field is much more homogeneous while frequency is 20 kHz. The system power is proportional to the square of coil current, and the power consumption for 50 kHz is about 165% that of 20 kHz with the same magnetic flux density. For Ф178 mm electromagnetic soft-contact system, the suggested frequency is about 20 kHz.
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发布时间：2023-12-18 - 摘要：The FEM software ProCAST was applied to the numerical simulation coupling temperature field with velocity field to simulate the technology of semi-sold A356 aluminum alloy pulps which are made by strong cooling with single-tube。Through the comparison of the simulation results and experimental results,we know the simulation results consistent with the experimental results,which can provide guide effects to experiment through simulation,and achieve the optimization of technology parameters of semi-solid A356 aluminum alloy pulps which are made by strong cooling with single-tube。关键词：Strong Cooling with Single-tube;Semi-solid;A356 Aluminum Alloy;Numerical Simulation;Temperature Field;ProCAST Software
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发布时间：2023-12-18 - 摘要：The temperature field of the solidification simulation for the large gear ring castings has been made with HUA ZHU CAE software, the position of shrinkage is watched ,Based on this,the design of these castings has been optimized,then ,analyzing and compare the simulation result. the result shows that the size and placement of the insulated riser and iron chill are intercalated reasonably could promise castings direct solidification and lengthen feeding direction of metal liquid. To obtain the castings of structure completely and no flaw.关键词：gear ring;Solidification Simulation;shrinkage;Process Optimization
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发布时间：2023-12-18 - 摘要：传统的低合金耐磨铸钢热处理工艺是将铸件加热到高温（8501050℃）,保温一定时间（一般16h）后淬入油中或水中,最后进行低温（200300℃）回火。研究发现,有些合金材料可以去掉高温热处理,直接利用铸造过程的余热淬火,而后铸件只要经过低温（200300℃）回火即可。通过上述热处理,合金材料的冲击韧度和硬度与采用传统热处理的性能接近,与此同时达到省能?省劳动力?缩短生产周期等目的。免高温热处理理念不仅在低合金耐磨铸钢中得到应用,在其他铸造合金材料中同样可以得到应用。关键词：耐磨铸钢;热处理;免高温热处理
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发布时间：2023-12-18 - 摘要：J339B型多功能可倾式金属型重力铸造机是一种沿机器轴线倾转的铸造机,它是为了满足倾转浇注工艺而设计研发的。该机广泛用于生产汽车用铝合金进气歧管和摩托车用铝合金减震器套筒以及高压开关用铝合金铸件,由于该机具有高度的通用性和先进性,从而大大提高了模具设计的自由度,有效地降低了铸件废品,使铸件良品率达到95%以上。关键词：可倾式;金属型;重力铸造机;研发;应用
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发布时间：2023-12-18 - 摘要：Direct-reading spectrometer is an effective equipment for metal analysis. How to determine the technical specification of DF-100 direct-reading spectrometer for analysis of stainless steel is described. Through inspection service comparing with the similar equipments precision of overseas companies, such as Spectro and ARL ect, the results show that the performance curve of DF-100 direct-reading spectrometer satisfies long-term use and doesn’t need to be re-draw. The determination of sample reproductivity is high and the instrument is stable during long-term stability service. It can not only meet the requirment of stainless steel analysis, but also save the massive demarcation time and chemical reagents. The analytical precision of element determination of stainless steel is level with overseas similar equipments.关键词：DF-100 direct-reading spectrometer;Stainless Steel;performance curve
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发布时间：2023-12-18 - 摘要：用光学显微镜（OM）和扫描电镜（SEM）对经国产、进口泡沫陶瓷过滤片过滤的1100铝合金进行微观组织和拉伸断口观察和分析。结果表明,进口陶瓷过滤片能更有效去除氧化物夹杂,明显改善1100铝合金铸轧板的偏析,力学性能得到了一定程度的提高,明显减少了终产品的制耳率;提高国产泡沫陶瓷过滤片质量应该不过于追求目数,应减少盲孔,适度增加表面积,综合考虑化学过滤作用。关键词：提高;泡沫陶瓷过滤片;质量
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发布时间：2023-12-18 - 摘要：By Optimized hardware machinery,The technique of casting and tilting die mould ,The technique of tilting die mould casting can be used to product Al alloy pressure-tight shell. It can reduce non-metallic inclusions and shrinkage defects.In the research,combining with Western European and Japanese technique, by controling pouring temperature,mould preheating temperature and machine rotation rates during cyclic casting, Casting shrinkage and dirt defects was predicted and casting process was optimized. high quality Al alloy pressure-tight shell parts can be manufactured. The technique were directly applied to workshop. The certificate rate of Aluminium alloy pressure-tight shell Leakage test up to 3‰关键词：Optimized hardware machinery;die mould casting;Aluminium alloy pressure-tight shell;tilting die mould casting
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发布时间：2023-12-18
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