最新刊期
卷 40 ， 期 5 ， 2020
- 摘要：A 3-D model of mechanical agitator was established and the flow fields were investigated under different anchor agitators, melting temperatures, agitator rotational speeds and the position of the agitator by using Fluent in ANSYS software combining with MRF model. The results present that through changing the anchor agitator shapes, little effect on flow field in the mixing process can be observed. With the increase of the melting temperature, the range of the melting flow is enlarged and the optimized temperature to setting the anchor agitator is more than 1 100 ℃. The maximum flow velocity of melting with 100 r/min agitator rotational speed is 1.47 m/s, which is twice as that of 50 r/min. When the distance between the agitator and the bottom of crucible is a quarter of the height, the range of the melting stirred is large, however, when the distance of that is one-eighth of the height, the melting under the agitator is stirred adequately. Mechanical stirring can improve effectively the melt flow rate and flow range.关键词：Glass Solidification;Electromagnetic Cold Crucible;Mechanical Stirring;Flow Field
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发布时间：2023-12-18 - 摘要：The solid state recycled process of TC4 titanium alloy chips was performed by hot pressing sintering method, and the microstructure and hardness tests of the recycled TC4 titanium alloy was analyzed to understand effects of hot pressing sintering temperature. The results reveal that under the given condition of hot pressing sintering process, the chips of TC4 alloy present a satisfied bonding with absence of any new phase, and the phase composition of recycled billet is consistent with the parent metal, which is still a typical α+β type structure. With the increase of sintering temperature, the growth of β-Ti grains in the microstructure of the recycled TC4 alloy can be observed with the blurring of grain boundary and the precipitation of some acicular α-Ti in form of clusters. The proportion of beta Ti phase in the microstructure will be increased, while the acicular α-Ti structure will be decreased significantly. When the sintering temperature is 1 200 ℃, the microstructure of the alloy is changed from basket weave structure into Widmanstatten structure. The micro-hardness of recycled TC4 alloy is increased with the increase of the sintering temperature.关键词：Hot Press Sintering;TC4 Titanium Alloy;Microstructure;Microhardness
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发布时间：2023-12-18 - 摘要：<正>2020年1～3月,主要铝产品生产保持总体平稳,电解铝产量884万t,同比增长2.7%,氧化铝、铝材产量1 693万t、1 052万t,同比下降7.2%、6.3%,降幅较1～2月收窄5.8、6.2个百分点;铝行业实现盈利31.3亿元,同比增长69.2%,其中铝矿采选、铝压延加工行业实现利润-0.2亿元、16.9亿元,同比下降116.7%、36.7%,铝冶炼行业实现盈利14.6亿元,同比增利24亿元;铝材出口112万吨,同比下降12.2%
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发布时间：2023-12-18 - 摘要：<正>近期,受中国航发集团贵阳航发精密铸造有限公司委托,中国科学院金属研究所高温合金研究部铸造高温合金课题组高质量完成了某型号用400件单晶叶片的批量生产任务,标志着该所已具备了复杂结构空心单晶叶片铸件的批产供货能力,实现了从科研到生产的转变。单晶叶片是先进航空发动机的关键热端部件,叶片的制造质量直接决定了发动机的整体性能。但复杂结构空心单晶叶片在成型性和单晶完整性等方面的控制难度较大,整体合格率较低。针对这一问题,铸造高温合金课题组近年
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发布时间：2023-12-18 - 摘要：<正>近期,成都天智轻量化科技有限公司和西南交通大学交通运输装备轻量化研究所团队开发成功了一款名为LITMAT-HTC-ZX61M的镁合金,简写为ZX61M。ZX61M镁合金热挤压状态的热导率高达165 W/（m·K）,抗拉强度为270 MPa,伸长率高达30%。其热导率与高热导率的铝合金相当,高于绝大多数铝合金,甚至高于青铜[（32～153） W/（m·K）]和黄铜[（70～109） W/（m·K）],而镁合金器件的散热速度大约是铝合金器件
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发布时间：2023-12-18 - 摘要：<正>从中国科学院包头稀土研发中心获悉,该中心孵化企业包头中科轩达新能源科技有限公司成功建设了一条拥有自主知识产权的新型稀土储氢合金电极材料生产线,并于近日投产运行,产品正式供应国内镍氢动力电池企业。该生产线打破了国外的技术垄断,其产品具有高容量、低自放电和低温等特点,可广泛应用于高安全型绿色环保镍氢动力电池,为混合动力汽车、氢燃料电池以及固态储氢等提供高性能材料。
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发布时间：2023-12-18 - 摘要：<正>钛合金因其具有质轻、高强及高温力学性能优异特性,是高推重比先进航空发动机压气机叶片首选材料。然而,钛合金抗高温氧化和热腐蚀性差,高温氧化环境下,必将造成钛合金压气机叶片因严重高温氧化和热腐蚀失效,降低发动机效率,造成严重事故。戴景杰团队在钛合金表面设计了系列高温防护涂层,并对涂层在800 ℃下1 000 h的循环高温氧化行为和800 ℃下300 h的热腐蚀行为进行了研究,构建了涂层在高温氧化和热腐蚀行为下的损伤模型,阐明了涂层在高温-
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发布时间：2023-12-18 - 摘要：<正>近日,郑州轻研合金科技有限公司成功实现大规格轻质高强铝锂合金锻件批量生产。本次开发的铝锂合金锻件主要为2系和5系铝锂合金,采用真空熔炼铸造法制备出高纯净铝锂合金铸锭,经大变形量热锻加工后获得高强韧铝锂合金锻件。锻件厚度为80～120 mm,最大长度超过2 000 mm,单件质量达300 kg,轻质高强铝锂合金锻件的批量生产对于航空航天器机身舱壁等零部件减重具有重要意义。郑州轻研合金科技有限公司通过不断探索及优化,掌握从熔铸、锻造到热
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发布时间：2023-12-18 - 摘要：<正>据了解,东轻为长征五号B运载火箭箭体提供了约200 t某系铝合金材料。长征五号B身高虽比长征五号矮了约3 m,质量轻了约20 t,但长征五号B的力量更足,一次能运送超过22 t的物品,是目前我国近地轨道运载能力最大的火箭。为保证火箭承载更多的燃料,把有效载荷顺利送入轨道,火箭外壳需要选用质量轻、强度高、耐腐蚀的材料。东轻研制的某系合金板材,具有高强、高韧、耐腐蚀以及超塑性等特点,可抵抗火箭在飞行过程中承受巨大的压力、温度差异及重力问题,
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发布时间：2023-12-18 - 摘要：<正>近日,内蒙古包头稀土研究院开发出了锆颗粒尺寸低于600 mm的稀土镁锆晶粒细化剂产品,填补了对应高效率、低成本镁合金晶粒细化剂的产品空白。"这为开发面向航空飞行器座椅、汽车安全构件、高速列车轻量化等轨道交通装备的高强度铸造/变形镁合金材料提供了可能。"稀土研究院镁合金项目组主任、博士研究生、正高级工程师胡文鑫对记者说基于前期针对稀土和Zr元素对镁合金耦合细化机制的研究成果,辅之以全新的冶金工艺制备方法,让分布更密集、体积更小的锆
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发布时间：2023-12-18 - 摘要：<正>近期,中国科学院金属研究所沈阳材料科学国家研究中心纳米金属科学家工作室李秀艳等人研究发现,利用快速升温可以在纳米晶铜中引入退火孪晶,从而实现纳米晶晶界的"热弛豫",提高纳米晶的热稳定性。研究发现,快速升温提高纳米晶稳定性的热弛豫方法,可以用于提高一般严重塑性变形所获得的亚微米和纳米晶的稳定性,这对于发展高稳定纳米材料和推动纳米金属的应用具有重要意义。研究人员依据基辛格效应,提出增加升温速率,可以提升晶粒长大温度,而不影响孪晶生长
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发布时间：2023-12-18 - 摘要：The micro-arc oxidization（MAO） ceramic layer on LA103 Z Mg-Li alloy was prepared in silicate alkaline electrolyte. The effects of oxidation voltage on microstructure and corrosion behavior of MAO coatings in 3.5% NaCl solution were investigated. The microstructure and phase composition of the coatings were characterized by SEM and XRD. In addition, the corrosion resistance of the ceramic layers was evaluated by hydrogen evolution method and weight loss analysis. The results indicate that the micro-porous morphology of MAO coating is formed gradually after growing for 40 s. Meanwhile, the thickness and micro-pore diameter of the coatings are increased with the enhancement of oxidation voltage, where the "crater" morphologies and the micro-cracks appear on the surface of the ceramic layer. The MAO coating is mainly composed of MgO and Mg2SiO4 phases. The hydrogen evolution rate of MAO coatings prepared with different oxidation voltages after 192 h immersion is presented as follows: v450 V<v500 V<v550 V<vsubstrate. Furthermore, the MAO coating with an oxidation voltage of 500 V has a minimum weight loss rate after immersion for 96 h. It is demonstrated that MAO coating can provide a positive corrosion protection for the substrate and the MAO coating prepared with 500 V has the desirable anticorrosion capacity.关键词：Magnesium-Lithium Alloy;Micro-arc Oxidation;Growth Characteristics;Hydrogen Evolution Method;Corrosion Behavior
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发布时间：2023-12-18 - 摘要：The effects of trace yttrium on the microstructure and mechanical properties of as-cast Mg-Al-Sn-Zn alloys were investigated by copper mold casting under the vacuum-Ar atmosphere protection. The addition of yttrium can generate the new phase of Al2Y and refine the α-Mg and eutectic Mg17Al12phase. With the increase of yttrium, the size and fraction of the new phase are increased. The results show that the proper amount of Y can improve the mechanical properties of the based alloy at room temperature. The alloy containing 0.5% yttrium has the satisfied mechanical properties with the tensile strength, yield strength and elongation of 247.7 MPa, 112.3 MPa, and 11.52%, respectively, which are 14.5%, 9.6%, and 17.1% higher than those of the based alloy, which are attributed to the fine grain strengthening and second phase strengthening.关键词：Vacuum-atmosphere Protection Melting;Copper Mold Casting;Yttrium;Mg-Al-Sn Alloy
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发布时间：2023-12-18 - 摘要：The microstructure and mechanical properties of Mg-8 Zn-1 Ag-0.7 Zr alloy were investigated by OM、SEM and tensile testing. The experimental results reveal that the Mg-8 Zn-1 Ag-0.7 Zr alloy is solidified in form of equiaxial crystal, and the as-cast alloy is mainly composed of the α-Mg、Mg-Zn-Ag ternary compound and Zn2Zr3 phase. The second phase is mainly distributed along the grain boundary. After heat treatment, distribution morphology of secondary phase is improved obviously on the grain boundary. Zn content in the matrix is changed greatly. After solid solution, Zn content in the alloy is increased from 3.09% in as-cast state to 8.24%, while it is decreased to 5.42% after aging treatment, presenting the satisfied precipitate strengthening effects. The tensile strength, yield strength and elongation of the alloy by T4 treatment reach 311.4 MPa, 147.4 MPa and 13.7%. After T6 treatment, the tensile strength, yield strength and elongation of the alloy reach 325.4 MPa, 217.6 MPa and 5.1%,respectively.关键词：Magnesium Alloy;Microstructure;Mechanical Properties;Heat Treatment
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发布时间：2023-12-18 - 摘要：The effects of Ti on the microstructure and mechanical properties of Mg95.5Y3Cu1.5 alloy with long period stacking ordered（LPSO） phase were investigated. The results reveal that the microstructure of alloys can be refined by Ti addition. The grain size of primary α-Mg phase in the alloys is decreased firstly and then increased with increasing in Ti contents. Meanwhile, the tensile strength and elongation of alloys are increased firstly and then decreased. With 0.4% Ti addition（in atomic fraction）, the tensile strength and elongation of the alloy reach 168 MPa and 6.4%, increased by 17.1% and 39.6%, respectively, compared with those of the Mg95.5Y3Cu1.5 alloy.关键词：Ti;Mg95.5Y3Cu1.5Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The mechanical properties of ductile cast iron with different Cu addition were tested by tensile tester and Brinell hardness tester. The dry friction and wear experiments were carried out with the reciprocating friction and wear tester. The microstructure of the sample was characterized by metallographic microscope and scanning electron microscope. The effect of copper on the wear resistance of ductile cast iron was discussed. The results show that the copper can improve effectively the wear resistance of ductile cast iron. The main wear mechanism is characterized by plastic deformation, and with the increase of pearlite content, the abrasive wear becomes serious. With the increase of friction time, the fatigue wear is increased. In addition, the increase of load can reduce the friction coefficient of materials.关键词：Ductile Cast Iron;Copper;Ferrite;Friction and Wear;Wear Rate
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发布时间：2023-12-18 - 摘要：The isothermal solidification samples of 6061 aluminum alloy at different temperatures were prepared. The isothermal solidification microstructure of the samples was observed by metallographic microscope, and the composition of different phases in the isothermal solidification structure was measured by SEM and EDS, and the types of different phases in the isothermal solidification samples were measured by X-ray diffractometer. The results show that the precipitation sequence of 6061 aluminum alloy during solidification is presented as follows: L→α-Al+Al4Cu9+CrMn3+Cu16Mg6Si7+Mn5Si3→Cr3Si→Cu2Mg→FeCr+Cu16Mg6Si→iron-rich phase→Al7Cu3Mg6+Mg2Si+α-AlFeSi. The harmful iron-rich phase in 6061 aluminum alloy during application is generated when the temperature is lower than 700 ℃. The second phase precipitated during solidification is mainly segregated at the grain boundary.关键词：6061 Aluminum Alloy;Isothermal Solidification;Secondary Phase;Grain Boundary
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发布时间：2023-12-18 - 摘要：The development history of copper-titanium alloys was described briefly, which included the aging transformation of binary copper-titanium alloys, the composition of binary copper-titanium alloys, the relationship between aging process and structure properties, the effect of adding trace alloying elements on the microstructure and properties of copper-titanium alloys and the main applications of copper-titanium alloys. Finally, the research trend of copper-titanium alloys was prospected.关键词：Copper Titanium Alloy;Elastic Material;Aging Strengthening;Alloying
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发布时间：2023-12-18 - 摘要：With the rapid development of the automotive industry on lightweight, aluminum alloy wheels produced by traditional casting processes have been unable to meet the performance requirements of large vehicles. So it is necessary to develop some new technologies to further improve the performance of aluminum alloy wheels. By summarizing the previous achievements on preparing A356 aluminum alloy wheels, A356 aluminium alloy melting was reviewed, emphasized on the roles of furnace refining technology as well as harm and removal mechansim of inclusion in aluminum alloy melt. On the basis, some valuable suggestions were put forward.关键词：A356 Aluminum Alloy;Refining Purification;Degassing;Modification;Refinement
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发布时间：2023-12-18 - 摘要：The composite use of aluminum/steel dissimilar materials can simultaneously exert the advantages of aluminum alloy and steel, and the use of aluminum/steel composite structural parts is an effective means to achieve "lightweight". The research progress of friction stir welding of aluminum/steel dissimilar materials was summarized, and the research status of aluminum/steel dissimilar metal friction stir welding at home and abroad was reviewed. There exists insufficient theoretical research on the formation mechanism and control method of intermetallic compounds in aluminum/steel joints, as well as the diffusion behavior of atoms during friction stir welding and the influence on atom diffusion, and prospects for future research directions were carried out.关键词：Friction Stir Welding;Aluminum/Steel Dissimilar Metals;Mechanical Properties
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发布时间：2023-12-18 - 摘要：In order to explore the feasibility of ZL114 A alloy forming by selective laser melting（SLM）, influences of process parameters on the morphology, surface quality and wetting angle of SLM forming o ZL114 A aluminum alloy were investigated. The results reveal that at a given scanning speed, the melting width is increased with the increase of laser power. When linear energy density is equal, melting width is equal. At a scanning speed of 2 500 mm/s and a power of 375～475 W, the track has the best continuity and ductility, and there exist a fewer defects such as spheroidization. With the laser power of 450 W, scanning speed of 2 500 mm/s, scanning interval of 0.09 mm and layer thickness of 50 μm, wetting angle and melting pool height are small, so wettability presents satisfy, and relative density of forming part reaches 99.94%.关键词：ZL114A Aluminum Alloy;Selective Laser Melting;Molten Pool Shape;Wetting Angle;Relative Density
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发布时间：2023-12-18 - 摘要：The microstructure and mechanical properties of 3 D-printed AlSi10 Mg alloy in annealing state were analyzed, and AlSi10 Mg alloy was treated in different heat treatment. The results reveal that the mechanical properties of laser forming AlSi10 Mg alloy are superior to those of ZL104 and LD2 alloy, and the microstructure of scanning direction presents strip-shaped piled-up structure, while microstructure of the forming direction shows irregular fish scale structure. With the increase of solution temperature from 525 ℃ to 545 ℃, the mechanical properties of the AlSi10 Mg alloy are decreased,such as tensile strength, yield strength, elongation and fracture contraction rate as a result of the increasingly serious over-burning phenomenon of microstructure. Taking into account mechanical properties and metallographic structure, the optimized solution temperature for AlSi10 Mg alloy is 525 ℃.关键词：Selective Laser Melting;AlSi10Mg Alloy;Heat Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The end cover of aluminum alloy belt gear box is an important part of small and micro low-speed motors. Its die-casting technology has eliminated the problem of deficient processing at the machining center, significantly improving productivity. A mold configuration with simple structure, reliable performance and the desirable parting surface was presented. Its side gate feeding design is benefitcial to both casting and removal of waste materials from the gate. Aiming at the irregular shape of the end cover casting and the dual-orthogonal bearing hole contained, it is need to accurately cutting to achieve highly-matched spigot and base, and bearing chamber and the bearing. A set of milling fixtures was presented of accurately positioning, reliable clamping without deformation, high turnover precision, concise and rational structure, and easy and convenient operation.关键词：Gear Box;End Cover Casting;Side Gate;Fixture Body
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发布时间：2023-12-18 - 摘要：Numerical simulation method was used to simulate the die-casting process of the aluminum alloy clutch housing to accurately understand the filling state and the casting defect distribution, and then to optimize the gating and exhausting system, greatly reducing the development time. Meanwhile, in trial-mold and trial-production process, origination of different defects was analyzed from the pouring parameters, process design and mould design, and the modified measures were proposed. The results show that a reasonable casting-exhausting system and cooling system are the keys to obtain high-quality clutch housing.关键词：Die-Casting Aluminum Alloy Clutch Housing;Numerical Simulation;Gating System;Cooling
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发布时间：2023-12-18 - 摘要：The investment casting NCu30-4-2-1 alloy with small batches and more kinds was carried out. The rod with size near finished product and meeting performance requirements were trial-produced by designing the rational investment casting parameters and multi-step temperature-reduction method. Aiming at the problems in low strength, the fracture morphology and micro-element of NCu30-4-2-1 alloy was investigated by scanning electron microscope（SEM） and energy spectrometer（EDS）. The results reveal that the local black spot can be observed in the poor strength sample, which is shrinkage porosities. The oxygen impurity element in the alloy and the developed dendrite are responsible for the shrink defect. Through effective by refining and purifying the alloy by trace master alloy as well as optimizing investment casting parameters, the shrinkage defects can be reduced.关键词：NCu30-4-2-1 Alloy;Investment Casting;Shrinkage Porosities;Dendrite;Strength
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发布时间：2023-12-18 - 摘要：The importance of surface quality of white pattern in LFC was described. It is important for quality rate of the LFC castings for white pattern with bright and clean degree, bead fusion between the qualification rate of casting. LFC is suitable for the requirement of tube and pipe with various kinds. The excellent white pattern is the basis of producing the good LFC tube and pipe.关键词：LFC;Ductile Iron Pipe Fittings;White Pattern Quality
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发布时间：2023-12-18 - 摘要：The lost foam casting（LFC） process was used to prepare the solid-liquid compound of Al/Mg bimetal with a Ni coating on the surface of A536 aluminium alloy prepared by plasma spraying technology, and the effects of pouring temperature and Ni coating on interfacial microstructure of Al/Mg bimetal were investigated with the help of scanning electron microscopy and energy dispersive spectrometer. The results reveal that the interface layer thickness of the Al/Mg bimetal with Ni coating is less than that of one without a Ni coating under the same conditions, and the compositions of the interface layer of the Al/Mg bimetal with Ni coating are also different from that of one without Ni coating. The pouring temperature also has a prominent influence on the interfacial microstructure and compositions of the Al/Mg bimetal with Ni coating. The thickness of interface layer is increased with the increase of the pouring temperature, and a acceptable interfacial microstructure can be obtained at 730 ℃.关键词：Pouring Temperature;Ni Interlayer;Lost Foam Casting;Al/Mg Bimetal;Interfacial Microstructure
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发布时间：2023-12-18 - 摘要：The TiC particle reinforced high chromium cast iron matrix composites were prepared by the lost foam casting process.Effects of the particle size on TiCp/Fe composite uniformity in a slurry pump back guard were investigated by SEM,EDS and energy spectrum analysis.The results show that with the particle size decreases,thmovement speed of the particles obtained through the air gap is increased and the distribution is more uniformThe uniformity is desirable of the composite castings of minimum standard deviation of the two sides at the samparticle size.The standard deviation of the composites is decreased with the particle size decreased to a minimum of 1.05.When the TiC particle size is 2 000 mesh,the rear panel has the satisfied uniformity,and the particles ardecomposed.关键词：Lost Foam Casting;High Chromium Cast Iron;Composites;Particle Size;Structure Uniformity
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发布时间：2023-12-18 - 摘要：The combination of numerical simulation and experimental research was used to analyze the feasibility of vacuum suction casting technology in the field of art casting by taking typical Guangong art castings as an example, and the pouring process design of vacuum suction casting hollow thin-walled art castings was explored. The results show that the process can manufacture successfully complete hollow thin-walled art castings with absence of defects on the surface, which meets the requirements of art crafts. With filling speed of 60 mm/s, the suction casting temperature of 710 ℃ and the mold temperature of 350 ℃, the Guangong art castings with complete contours, clear texture and sharp edges were obtained.关键词：Vacuum Suction Casting;Art Casting;Gating System;Process Parameters
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发布时间：2023-12-18 - 摘要：As a new material, high entropy alloy has attracted many material researchers because of its excellent comprehensive mechanical properties and corrosion resistance. The research status of corrosion resistance of CoCrFeNi high entropy alloy was reviewed from the aspects of alloying, pre-deformation treatment and heat treatment, and the future trend of CoCrFeNi high entropy alloy was prospected.关键词：CoCrFeNi High Entropy Alloy;Corrosion Resistance;Pre-deformation
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发布时间：2023-12-18 - 摘要：AlCoCrFeNiTix（x=0, 0.4, 0.8, 1.0） high entropy alloys（HEAs） were prepared by non-consumable vacuum arc melting furnace. The microstructure and wear resistance of the AlCoCrFeNiTix were investigated. The experimental results reveal that high entropy alloys AlCoCrFeNiTix are transformed from a single body-centered cubic structure（BCC） into two kinds of body-centered cubic structures with the increase of Ti content, and the morphology of alloy is transformed from dendrites into the petal-like equiaxed crystals. Meanwhile, there exists the enrichment of alloying element that Al-Ni-Ti elements are mainly distributed in dendrites, while Fe-Cr elements are mainly concentrated between dendrites. In addition, the hardness and the volume of wear resistance of the AlCoCrFeNiTi0.8 HEAs reach 525.2 HV and 6×10-4 mm3, indicating that AlCoCrFeNiTi0.8 HEAs have the desirable wear resistance.关键词：High Entropy Alloys;Non-consumable Vacuum Arc Melting Furnace;Microstructure;Wear Resistance
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发布时间：2023-12-18 - 摘要：Effects of hydrogen on the microstructure and mechanical properties of TiAl alloy hydrogenated by plasma were investiagted. The actual hydrogen content measured by the LECO ROH600 hydrogen and oxygen analyzer reach 0.060%. The XRD, SEM, microhardness, room temperature and high temperature mechanical properties, and high temperature deformed microstructures were analyzed for hydrogenated and unhydrogenated TiAl alloys. The results reveal that the phase composition of TiAl alloy with hydrogen is absent change, and it is still γ-TiAl and α2-Ti3Al. Hydrogen exists in solid solution in the TiAl alloy. After the TiAl alloy is hydrogenated by plasma, the hardness and compressive strength at room temperature are improved. The flow stress during high temperature deformation is decreased, and the degree of material recrystallization is improved, so the deformation presents more uniform.关键词：TiAl Alloy;Plasma-hydrogenation;Microstructure;Mechanical Properties;EBSD
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发布时间：2023-12-18 - 摘要：The effects of a new chilled sand on the microstructure and properties of casting aluminum alloy were investigated. By comparision of the grain size, density and mechanical properties of ZL114 A alloy samples which were prepared in the silicon sand and chilled sand, the effects of the chilled sand were analyzed. The results reveal that the chilled effect of the new chilled sand-Fe sand is remarkable, the density of casting aluminum is increased from 2.62 g/cm3 to 2.69 g/cm3, the tensile strength is increased by 2.6%, and the elongation is increased by 87%.关键词：Sand Mould;New Chilled Sand;Castings
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发布时间：2023-12-18 - 摘要：Effects of Cu on microstructure and biodegradation behavior of Zn-0.8 Mg alloy were investigated. The results show that the primary η-Zn phase in the alloys is further refined with the increase of Cu contents, and the average grain size is gradually increased from 106 μm to 43 μm. Moreover, the volume fraction of second phase is gradually increased with the increase of Cu contents. The results reveal that corrosion rate and self-corrosion current density of the alloys are gradually increased with the increase of Cu contents, indicating that the degradation rate of the alloys in Hank’s solution is gradually increased.关键词：Cu;Zn-0.8Mg Alloy;Microstructure;Biodegradation Behavior
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发布时间：2023-12-18 - 摘要：The grain size, quantity, shape and other characteristic parameters of Bi phase in the microstructure of Sn-Bi alloy have great influence on the mechanical properties and welding properties of solder, so it is necessary to carry out quantitative analysis. The preprocessing program of metallographic such as image enhancement, filtering and threshold segmentation was developed under the LabVIEW platform, and the statistical analysis of the particle size, ratio and axial length of the metallographic structure was realized. The results show that the system can screen quickly and efficiently and analyze quantitatively the microstructure of Sn-Bi alloy and other materials, providing a reference for the research of toughening mechanism of solder.关键词：Sn-Bi Alloy;Image Processing;Metallographic Analysis;LabVIEW
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发布时间：2023-12-18
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