最新刊期
卷 41 ， 期 10 ， 2021
- 摘要：0.3%TiN nanoparticles reinforced Al-Cu-Mn composites were prepared by ultrasonic assisted mechanical stirring, and microstructure and mechanical properties of the composites were investigated. The results reveal that the grain size of the metal matrix is significantly refined from 182.74 μm to 69.61 μm, and the microstructure become equiaxed structure. Meanwhile, the average size of nanoparticles agglomeration is decreased from 197.08 nm to 173.92 nm. The yield strength, tensile strength, elongation and hardness of prepared Al-Cu-Mn composites are increased by 16.73%, 14.99%, 58.81% and 11.68%, respectively, indicating that the comprehensive mechanical properties of Al-Cu-Mn composites are improved. The tensile fracture of TiN nanoparticles reinforced Al-Cu-Mn is characterized by quasi-cleavage, where river patterns are increased obviously, and large amounts of dimples formed by the exfoliation of TiN nanoparticles are evenly distributed.关键词：Ultrasonic Assistance;Mechanical Stirring;TiN Nanoparticles;Al-Cu-Mn Alloy;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The effects of different solid solution temperatures on the microstructure and mechanical properties of 2195 Al-Li alloy were investigated by differential thermal analysis, electron microscopy analysis, and tensile tests. The results indicate that solution treatment can improve the mechanical properties of 2195 alloy. As the solid solution temperature increases, the residual Al2Cu phase is gradually dissolved into the matrix, leading to the maximum supersaturation solid solution, achieving solid solution strengthening. However, the deviation of solid solution temperature from the optimal system promotes the recovery of recrystallization and over-burn in the alloy, resulting in deterioration of the mechanical properties.关键词：Al-Li Alloy;Solid Solution Temperature;Mechanical Properties;Microstructure
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发布时间：2023-12-18 - 摘要：The hard composite preparation method based on hot pressing and sintering was adopted, and rare earth oxide CeO2 powder and the grain growth inhibitor VC powder were induced into the graphene-contained WC-Al2O3composite powders to prepare a new type of composites. The phase composition, microscopic morphology, densification process and mechanical properties were investigated. The results indicate that the addition of CeO2（0.1%） and VC（0.3%） results in the increase of the composite density from 95.536% to 98.059% and 97.256%, respectively. The brittle phase W2C in the sintered specimen is reduced with mechanical property improvement. CeO2（0.1%） has a great effect on the fracture toughness, which is increased by 26.25%. Grains in composites are fine, round and smooth without abnormal growth, VC（0.3%） has a significant effect on the hardness. The Vickers hardness is increased by 21.06% compared to the original one with the smallest grain size and incomplete fusion, where a small number of pores exist between some grains. Synchronous addition of CeO2（0.1%） and VC（0.3%） leads to the dissolution of large amounts of Ce and V into the crystals, which promotes the vacancy generation, accelarate the transfer of substance and the growth of crystal grains, and reduces refinement effect. Meanwhile, more gas generated by the reaction is harmful to material densification.关键词：WC-Al2O3Composites;Mechanical Properties;Structure Morphology
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发布时间：2023-12-18 - 摘要：The phase transformation law of hydrochloric acid dissolved high pure aluminum ash were investigated by XRF, SEM, XRD and other analytical methods. The results indicate that the high-purity aluminum ash is composed of long strip, columnar, rodlike and spherical particles with phases composed of Al, Al2O3, Al2OC and BaO etc., and acid-leached residue phases are AlN, Al2O3 and Al（OH）3. In hydrochloric acid, the dissolution rate is increased with the increase of liquid-solid ratio and temperature, which reaches the maximum value at 65 ℃. The phase containing Al is transformed into [AlCl3（H2O）6] during acid leaching. The structure of formed polymeric aluminum is transformed from tetrahedron and octahedron to polymers, where a stable six-membered ring structure is formed by hydroxyl group, and the monomer is polymerized with hydroxyl group on the six-membered ring at a vertex H to form a plug-in multi-dimensional network structure.关键词：High Pure Al Ash;Dissolution Behavior;Phase Transformation
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发布时间：2023-12-18 - 摘要：The energetics and electronic structures of W doped γ-Co/γ′-Co3Al interface region model were calculated by the first principles method based on plane-wave pseudopotential theory. The results demonstrate that the substitution of W atom for Al atom sited in γ-Co/γ′-Co3Al interfaces can improve the rupture strength of the γ-Co/γ′-Co3Al interface. However, the substitution of W atom for Al or Co atom in other place has little effect on the rupture strength of the phase boundary region. The analysis of electron densities of states（DOS） and the distributions of valence electron densities of γ-Co/γ′-Co3Al interface indicate that the doping of W leads to the strong electron interaction between W and its nearest neighbor Co atoms, resulting in the enhancement of the interlayer atomic bonding interaction in the phase boundary region, which is the direct reason for the enhancement of the rupture strength of γ-Co/γ′-Co3Al phase boundary.关键词：γ-Co/γ′-Co3Al Interface;Interface Griffith Rupture Work;W Alloying
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发布时间：2023-12-18 - 摘要：The friction and wear properties of forging and solution-aged Cu-Ni-Al-Be alloys were investigated by UMT-2 friction and wear tester. Wear morphology and the aged precipitation of Cu-Ni-Al-Be alloy were characterized by SEM and TEM. The primary phase of Cu-Ni-Al-Be alloy is coherent NiBe precipitation after solution at 1 000 ℃×1.5 h and aged at 450 ℃×3 h treatment. The friction coefficient and wear loss of aged alloy is less than that of the forged ones at low load and low speed. The wear mechanisms of both forged and solution-aged alloy are dominated by abrasive wear and adhesive wear at low load and low speed, which are oxidation wear and delamination wear at high load and high speed. Wear resistance of Cu-Ni-Al-Be alloy is desirable after solution-aged treatment.关键词：Cu-Ni-Al-Be Alloy;Solution-aged;Friction and Wear
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发布时间：2023-12-18 - 摘要：<正>从中国科学院金属研究所沈阳材料科学国家研究中心获悉,该中心纳米金属科学家工作室博士后徐伟、张波研究员、李秀艳研究员和卢柯院士等研究发现,受限晶体结构可显著降低铝镁合金中的高温原子扩散速率。在铝镁合金平衡熔化温度附近,受限晶体结构的表观晶间扩散速率比同成分材料的晶界扩散降低约7个数量级。该发现不但揭示了受限晶体结构的一种全新原子扩散行为,而且表明金属材料的高温原子扩散速率可以利用这种新型亚稳结构得到大幅度降低,这为发展高性能高热稳定性金属材料开辟了一条全新的途径。原子扩散是材料制备加工过程中调控材料结构性能的一个基本过程。
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发布时间：2023-12-18 - 摘要：<正>近日,青海盐湖特立镁有限公司为比亚迪汽车定制的汽车方向盘即将送往位于西安的比亚迪汽车生产线,此次生产的方向盘全部采用金属镁一次压制成型技术。目前,特立镁联合上海宝钢技术中央研究中心、上海交通大学、上海理工大学、重庆大学、青海大学等多家科研机构和院校,在镁合金性能改进、镁合金压铸产品,尤其在新能源汽车、航空、通讯器材等领域进行开拓与创新,并在高性能镁合金压铸件开发关键技术研究与示范、
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发布时间：2023-12-18 - 摘要：<正>近日,我国首个3.35m直径铝锂合金火箭贮箱在火箭院诞生,经各环节试验检测合格且性能良好,初步具备工程应用条件。该贮箱采用了第三代高性能Al-Li合金,与当前国际主流Al-Cu合金贮箱相比,强度提升30%左右,同等条件下结构减重15%以上。第三代Al-Li合金贮箱的问世,是我国运载火箭结构效率和运载能力进一步提升的重要标志。目前仅美国航天飞机、法尔肯和前苏联能源号等运载火箭,在贮箱结构上大面积使用了Al-Li合金,这使其结构效率和运载能力达到国际领先水平,代表了运载火箭贮箱的发展方向。
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发布时间：2023-12-18 - 摘要：<正>国际镁协在78届世界镁业大会上揭晓了2021年国际镁协汽车类铸件优秀奖,获奖项目为斯巴鲁Crosstrek Hybrid插入式混合动力汽车（PHEV）的AZ91D镁合金充电器外壳,获奖企业为万丰镁瑞丁轻量化技术公司（以下简称"万丰镁瑞丁"）和斯巴鲁汽车公司。镁合金充电器外壳是由斯巴鲁汽车公司与万丰镁瑞丁协同设计的产品。该镁合金部件在万丰镁瑞丁的上海工厂生产,在日本完成组装,具有出色的散热性能,可在240V下快速充电。部件采用两个AZ91D镁合金铸件组装,
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发布时间：2023-12-18 - 摘要：<正>近日,由包头金山磁材有限公司研发的高频稀土永磁电机用高性能低涡流烧结钕铁硼磁钢制造技术获得突破。项目采用多合金技术,不同合金根据特性分别进行成分、氧含量及组织结构控制,使磁体保持低的电导率,同时有较好的富钕相分布及优良的显微组织结构;磁体后加工采用特定单元划分与组合,局部采用高温固化绝缘胶粘接处理,使磁体高频工况时发热降低。在成形工艺上,采用异形产品一次成形工艺,减少投料比,减少后加工程序及人员投入,降低生产制造成本。项目的实施,既改善了高频应用领域磁体涡流发热高的问题,同时磁体综合磁性能大于74,也是高磁能积、高矫顽力双高磁体在性能方面的一次突破。
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发布时间：2023-12-18 - 摘要：<正>一、概述面对激烈的市场竞争和个性化的客户需求,铸造企业应及时准确地控制生产成本。成本管理直接关系到企业的生存和发展。然而,由于生产过程数据庞大、工艺复杂、生产任务繁重,铸造企业的生产成本管理难度越来越大。目前,传统的成本管理方法已经落伍,传统成本控制由于缺乏现代方法,已不能满足代工企业成本管理的需要。中国铸件产量连续多年居世界第一,目前约占世界总产量的44%,但我国并不是铸造强国。发达国家通过重视信息技术的运用,采用先进的铸造技术,使铸造行业变得越来越强大。一个重要原因是中国铸造企业的软实力远远落后于发达国家（如美国、日本）等;甚至落后于新兴工业化国家和发展中国家,如巴西和印度。主要体现在企业管理不善,存在各种问题。这些问题来自不同的业务,不同的部门。
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发布时间：2023-12-18 - 摘要：<正>一台集合了最新技术的设备在世界范围内的首次亮相,总是能吸引大家的眼球,但要是想了解它的特点,功能,就必须通过官方给到的文字材料,不同国家的专业使用者需要有准确的翻译,将其翻译成各国语言,才能使之在世界上更好的为人所知。对产品的说明书和介绍文案的翻译要做到精准,因为如果翻译的有错误的话,将会给各国的使用者造成不便,无法了解产品的亮点,使用者也无法知道关于这台设备的使用和保养的知识,这给不同国家操着不同语言的从业者,带来了技术交流上的障碍,所以说专业领域的翻译很重要,特别是在铸造专业,由于在生产过程中的专业词汇比较多,比较复杂,
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发布时间：2023-12-18 - 摘要：<正>育人育才一直是我国社会发展中最为重要的任务,是保证未来技术与经济发展的第一保障,也是提高生产效率与发展能力的必要条件。铸造领域作为我国工业社会中最为重要的组成部分,提升该专业教师的教学水平并优化教育教学模式对其发展意义重大。同时,三位一体教育改革与创新创业教育理念深化在我国近年来的教育事业发展中取得了较为显著的成果,因此,进一步促进三位一体时代教育背景下的铸造专业研究生的创新创业教育模式发展是推动我国铸造领域进步的重要环节。
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发布时间：2023-12-18 - 摘要：<正>随着近年来我国科学技术快速发展,互联网媒体的快速普及,人们的艺术审美水平也在快速提升,商业插画被广泛应用到诸多行业产品包装设计中,应用最有效、最简洁、最具艺术特征的商业插画设计方案增强产品包装的视觉审美效果。人们对铸造企业产品有着不同需求,对不同种类、不同规制、不同特性铸造类产业有着不同的审美感受,再加上商业插画作为一种有效的艺术表达方式,也能较为全面反映出当前社会主流艺术审美意识形态,因此,在铸造企业产品包装设计中发挥着重要作用。通过对商业插画在铸造企业产品包装设计中应用方式的有效分析,可以更好总结商业插画在包装设计领域应具备的科学意义与实践价值。
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发布时间：2023-12-18 - 摘要：<正>随着汽车减重和节能趋势以及工业、制造业的不断发展,中国的铸件市场大幅增长,未来,受益于我国较低的劳动力成本和制造成本,中国的铸件市场将进一步加速增长。当前,受到我国宏观经济发展大环境宏观形势的影响,铸件市场在起伏中前进。2015年底是我国铸件十年来第一次开始出现减速增长,2016年铸件产量重新开始回归快速平稳上升,2017年为铸件历史同期最低水平,达4 940万t,同比上年同期增长4.66%,截至2019年底,我国全年铸件生产产值总数累计为4 875万t。2014～2019年,铸造行业整体表现出涨跌相伴的运行态势,铸造行业呈现中低速增长,行业产量仍处于较高的水平。
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发布时间：2023-12-18 - 摘要：<正>在低压铸造机械领域,低压铸造技术的工作原理是通过在坩埚中加入压缩的空气,将熔融液态金属推送到预先设计好的铸型中,同时在冷却的过程中持续加入压缩气体,直至完成铸件的生产。不过在这样的传统生产环节中,虽然有了事先做好的模具,但仍会因为人工操作下可能出现的一些操作失误导致低压铸造机械的生产质量下降。人们为了解决这些问题开始设想,是否可以采用计算机数字化的控制方式来完成低压铸造件的生产?可以减少人工的可编程逻辑控制器PLC随着传感器和单片微型计算机技术的发展,让这一切设想都成为了可能。
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发布时间：2023-12-18 - 摘要：<正>随着我国近年来经济的飞速发展与城市化进程的进一步加快,在现下的发展模式中,我国实现了第一、二、三产业之间的充分平衡发展,有效带动了我国工业社会与经济社会中各产业与各领域的快速进步,成功地使我国人民的生活质量得到改善,并促进了社会中各项生产动力的再发展与再进步。旅游产业作为我国第三产业中的一项至关重要的组成部分,为经济财富的创造与积累贡献了巨大力量,因此,旅游产业在现行发展状态中也得到了各领域及相关管理部门的充分重视,如何进一步推动旅游产业的发展也被相关学者作为第三产业内的一项关键问题所重视。
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发布时间：2023-12-18 - 摘要：<正>近年来,由于我国科学技术的不断创新、人才教育制度的改革与完善、以及各管理部门的大力支持,我国经济社会与工业社会的发展经历了翻天覆地的变化,其表现为物质财富高速增加、生产效率与生产质量稳步提高,这不但显著地改善了我国居民的日常生活质量,而且使整个社会风貌发生了巨大改变。同时,经济与社会的发展还有效带动了各类相关产业的进步与发展,而这些相关产业又反哺于工业和商业发展,进而有力地推动了传统行业和传统企业的转型与改革。因此,面向于工业社会与经济发展的现阶段背景,如何进一步提升工业生产能力与经济进步水平已经成为当代行业管理者、从业者,以及相关交叉领域研究者所共同专注的首要问题,
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发布时间：2023-12-18 - 摘要：Taking Al-0.5 Mg-0.24 Si alloy as object, the effects of rare earth element La on the microstructure, electrical conductivity, mechanical properties and corrosion resistance of Al-0.5 Mg-0.24 Si alloy were investigated. The results indicate that the combination of La with Si can generate rare earth phase LaSi2, which promotes the transformation from the β-Al5FeSi phase to α-Al8Fe2Si phase. After hot rolling and heat treatment, the appropriate addition of La can enhance the electrical conductivity and tensile properties of Al-0.5 Mg-0.24 Si alloy. With the addition of 0.1% La, the electrical conductivity reaches the maximum value of 31.80 MS/m. With the addition of 0.3% La, the tensile strength and the elongation reach 175 MPa and 22%, respectively, whereas the addition of La can reduce the corrosion resistance of Al alloy.关键词：Rare Earth Element La;Al-Mg-Si Alloy;Electrical Conductivity;Mechanical Properties;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：Fex（CoCrNiV）100-x high entropy alloy was smelted and prepared by vacuum arc furnace. The microstructure and mechanical properties of Fex（CoCrNiV）100-x high entropy alloys with different Fe contents were tested and analyzed by metallographic microscope, X-ray diffraction（XRD）, scanning electron microscope（SEM）, energy dispersive spectrometer（EDS） and universal tensile testing machine. The results indicate that the microstructure of Fex（CoCrNiV）100-x high entropy alloy is characterized by dendrite or lamellar structure.With the increase of Fe content, the phase structure of the alloy is transformed from FCC+intermetallic compound（σ phase） to FCC+BCC+σ phase, then to FCC+BCC phase, and finally to BCC single phase. When x=50, the comprehensive strength and toughness of alloy are desirable, where the tensile strength reaches 857.3 MPa, and the total elongation reaches 39.4%.关键词：High Entropy Alloy;Microstructure;Mechanical Properties;Structural Transformation
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发布时间：2023-12-18 - 摘要：The micro-structure and mechanical characteristics of the multi-layer nickel-plated copper foil welding by blue light laser with 450 nm were investigated. Nickel-plated copper foil with 20 layers were welded onto nickel-plated copper sheet with 0.5 mm, and the effects of different welding speeds on the weld morphology and tensile strength were investigated. The morphology on the weld failure mode and the micro morphology of the fracture were analyzed, and the electrical conductivity of the weld were tested. The results indicate that during the blue laser welding process, the depth of penetration is easily controlled.With the increase of welding speed, the weld penetration depth is gradually decreased, and the tensile strength of the weld is increased at first and then decreased.When the welding speed is 30 mm/s, the tensile strength of the weld reaches the maximum of 75 MPa. Blue laser can be successfully applied to the welding of multi-layer nickel-plated copper foil and laser welding leads to good mechanical properties.关键词：Blue Laser;Nickel-plated Copper Foil;Laser Welding;Tensile Strength
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发布时间：2023-12-18 - 摘要：The remedial program for substandard heat-resistant performance of the heat-resistant conductive aluminum alloy was mainly carried out. Through the monofilament and aluminum rod heat treatment, the experimental results demonstrate that heat treatment of heat-resistant monofilament at 190 ℃ for 7 h can improve the heat resistance of the monofilament by 5%～7%, which is generally in the range of 95%～97%. However, the subsequent strand is prone to bruise due to the lack of oil film on the surface of the monofilament. Heat treatment of heat-resistant aluminum rod at 290 ℃ for 7 h can improve the heat-resistance of monofilament by 1.5%～3% after drawing, which is generally in the range of 90%～93% with absence of surface quality defects.关键词：Heat Treatment;Heat-resistant Aluminum Alloy;Heat Resistance
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发布时间：2023-12-18 - 摘要：Effects of the electromagnetic stirring（EMS） on the solidification microstructure and properties of the Cu-10 Fe alloy were investigated. The results indicate that the EMS can effectively refine the grain in Cu-10 Fe alloy and reduce the supercooling degree of melted alloy, resulting in the formation of dendritic Fe phase instead of spherical Fe phase before the alloy enters the immiscible temperature region of the metastable liquid components. When the EMS current is 300 A, the Fe dendrites are broken and the Fe phases solidified firstly are separated to ingot surface by centrifugal force of violent rotating and stirring, resulting in the significant macrosegregation. Moreover, EMS has little influence on the conductivity of Cu-Fe ingot in the range of 21.46～22.04 MS/m. However, the fragmentation and refinement of electromagnetic stirring is contributed to the strengthening of the mechanical properties of Cu-10 Fe alloy during drawing. In conclusion, the electromagnetic stirring current of Cu-10 Fe alloy should not be too large, and 150 A is a reasonable parameter to improve the Cu-10 Fe ingot quality.关键词：Electromagnetic Stirring;Cu-Fe Alloy;Solidification Microstructure;Fe Dendrites;Conductivity
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发布时间：2023-12-18 - 摘要：The microstructure, mechanical properties and corrosion resistance of Mg-2 Zn-0.2 Sr-0.6 Zr-xNd（x=0, 1, 2, weight fraction） alloy were investigated by optical microscope（OM）, scanning electron microscope（SEM）, transmission electron microscope（TEM）, universal material testing machine and electrochemical experiments. Microstructure experiments show that the addition of Nd can refine the grain size and the granular Mg-Zn-Nd second phase（T phase） which grows up with the increase of Nd content is uniformly distributed. Tensile tests at room temperature show that trace amount of Nd can improve the yield strength and tensile strength, however the elongation is decreased slightly with the increase of Nd content. The degradation behavior of Mg-2 Zn-0.2 Sr-0.6 Zr-xNd alloy was analyzed by using Hank’s solution. The results show that the corrosion rate of Mg-2 Zn-0.2 Sr-0.6 Zr-xNd（x=0,1,2） is 0.49 mm/a, 0.39 mm/a and 1.12 mm/a, respectively. With 1%Nd addition, corrosion resistance of the alloy can be improved. However, the corrosion resistance of the alloy with 2%Nd is decreased significantly. In general, Mg-2 Zn-0.2 Sr-0.6 Zr-1 Nd has the satisfied combination of mechanical properties and corrosion resistance.关键词：Magnesium Alloy;Mg-2Zn-0.2Sr-0.6Zr-xNd Alloy;Microstructure;Mechanical Properties;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：The continuous casting process of 2219 aluminum alloy was simulated by Fluent software.The optimal ultrasonic application mode in continuous casting process was explored to achieve the uniform grain structure of casting ingots through the combination of simulation experiment of small ingot and the numerical simulation. The results indicate that different solidification speeds lead to uneven grain structure in the continuous casting ingots, and the ultrasonic application method has a great influence on the effect of grain refinement.When the solidification time is 4 min, the ultrasonic refining is more uniform in the first minute, reaching 24.5%. At the end of solidification, the ultrasonic refinement effect has a large gradient, which is decreased along the action direction.During the continuous casting process, ultrasound was applied in the middle of the width direction, and the prober should be located above the mushy zone.关键词：2219 Aluminum Alloy;Casting;Ultrasonic Treatment;Grain Refinement
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发布时间：2023-12-18 - 摘要：Grain refinement of Mg-6 Al-1 Y alloy was achieved by the collaboration of copper mold injection casting and cryogenics treatment. The influences of cryogenics treatment on non-equilibrium solidified structure and subsequent precipitation behavior were investigated. The results reveal that with the increase of undercooling and corresponding nucleation rate, the formation of fine equiaxed dendrite grains with partial micron-size granular grains can be observed, accompanied by the formations of high supersaturated structure and considerable dislocation defect under the non-equilibrium solidification condition. Stress accumulation induced by cryogenic treatment is beneficial to the fragmentation of fine dendrites in rapidly cooled alloy and spheroidization of segments occurs subsequently. The average grain size is decreased to 10 μm and the amount of dislocation density is increased significantly after cryogenics for 32 h. As for the rapid cooled and cryogenic treated alloy, discontinuous precipitation at grain boundary is accelerated during the isothermal annealing at 200 ℃ for 16 h. Moreover, both the morphology and quantity of continuous precipitation within grain are improved effectively. The resultant hardness is increased to 71.3 HV, which is 11.9% higher than that of the original rapidly cooled alloy.关键词：Non-equilibrium Solidification;Cryogenic Treatment;Grain Refinement;Precipitation
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发布时间：2023-12-18 - 摘要：A mathematical model of heat transfer was established, and the changes of the temperature field during the solidification process of ingots with ?40 mm～?160 mm were analyzed. The results indicate that the larger-scale ingot has a larger temperature gradient and stronger segregation tends to occur. Although electromagnetic stirring can well control the solidification process of the alloy, electromagnetic stirring is not a good solution foringots with small cross-section of ?40 mm. For larger-scale ingot with ?160 mm, linear stirring is more effective than rotary stirring, of which the effect is desirable at the current of 100 A and the frequency of 8 Hz to 10 Hz.关键词：Cu-6Ag Alloy;Solidification;Electromagnetic Stirring;Segregation
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发布时间：2023-12-18 - 摘要：The effects of solution temperature and cooling rate on the microstructure, ambient and elevated mechanical properties of TC11 titanium alloy were investigated. The results indicate that with the increase of solution temperature and cooling rate, the content of primary α phase in TC11 titanium alloy is decreased obviously, and the secondary α phase becomes finer with more dispersed distribution. At the same solution temperature, the room temperature strength and 500 ℃ high temperature strength of the alloy are increased, and the plasticity is decreased significantly with the increase of cooling rate. After 950 ℃ water cooling treatment and aging, the strength of the alloy reaches over 1 300 MPa.关键词：TC11 Titanium Alloy;Solution Temperature;Cooling Rate;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The application of numerical simulation of rheological forming of alloy can effectively predict the filling and solidification process in semi-solid forming, analyze the pressure field, velocity field, solid phase distribution, filling speed, filling temperature and defects in forming process, and provide relevant decision help for the related schemes optimization of process and design. The theoretical basis of numerical simulation were reviewed of rheological forming in recent years as well as the research progress and future development direction of rheological forming alloys at home and abroad.关键词：Semi-solid;Rheological Forming;Numerical Simulation
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发布时间：2023-12-18 - 摘要：In recent years, magnesium alloys have attracted much attention because of their lower density, higher specific strength and higher specific stiffness. However, due to the low plasticity and toughness of magnesium alloy and the poor formability at room temperature, the application of magnesium alloy was limited. The formability and ductility of magnesium alloys can be improved by adding some elements, such as zinc and calcium. Mg-Zn-Ca alloys have attracted more and more attention due to their low cost, good precipitation hardening properties, creep resistance and good biodegradability. The research progress in Mg-Zn-Ca alloys in recent years was summarized focusing on material research, alloying and processing methods of Mg-Zn-Ca alloys at home and abroad, and the future development of Mg-Zn-Ca alloys was prospected.关键词：Mg-Zn-Ca Alloy;Alloying Method;Mechanical Properties;Processing Method;Composites
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发布时间：2023-12-18 - 摘要：Biodegradable magnesium alloys have good promising applications as biomaterials. Firstly, the main problems of biodegradable magnesium alloys as biomaterials were reviewed. Then, two methods including alloying and surface modification in improving the degradation resistance and biological activity of magnesium alloys were described. Besides, the recent progress in the magnesium alloys as biodegradable cardiovascular stent and bone repair materials were also introduced. Finally, the future development of biodegradable magnesium alloys was pointed out.关键词：Biodegradable Magnesium;Alloying;Surface Modification;Cardiovascular Stent;Bone Repair Materials
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发布时间：2023-12-18 - 摘要：Using M40 J carbon fiber braided laminated puncture structure preform, ZL301 as matrix alloy, four kinds of laminated puncture Cf/Al composites were prepared by vacuum pressure infiltration method. The effects of Z-direction puncture structure parameters on microstructure, phase composition and tensile properties of Cf/Al composites were investigated, and their fracture deformation behavior and tensile fracture morphology were analyzed. The results show that the Z-direction puncture structure parameters have significant influence on the microstructure and properties of Cf/Al composites, where the average tensile strength of 1#（single strand, 3 mm/pin） and 2#（single strand, 4 mm/pin）, 3#（double strand, 3 mm/pin）, 4#（double strand, 4 mm/pin） Cf/Al composites reach 623, 353.3, 650.2 and 473 MPa, respectively. In addition, tensile strength of 2# composites is the lowest among the four structures, while that of 4#（double strand, 4 mm/pin） Cf/Al composite is the highest value which is about twice as much as that of 2#composites. The Cf/Al composites with a distance of 3 mm/needle presents less micro infiltration defects and the higher tensile strength. The Z-direction yarn failure delamination phenomenon is easy to appear when single strand pierced yarn is stretched longitudinally. According to the deformation and fracture behavior of Cf/Al composites, the tensile failure process can be divided into three stages: the stage of fiber and matrix bearing, the stage of fiber bearing the load mainly, and the stage of fracture failure.关键词：Laminated Puncture;Cf/Al Composite;Microstructure;Tensile Properties
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发布时间：2023-12-18 - 摘要：The surface of SiCp was coated with Cu by electroless plating method. Taking 2024 Al alloy as the matrix, 60%SiCp/Al-matrix composites were prepared by direct-heating powder thixoforming process, and the effects of Cu coating on the microstructure, phase composition, fracture behavior, flexural strength and thermal expansion coefficient of composite were investigated. The results indicate that after Cu plating, the matrix of the composite is composed of intermetallic compounds dominated by AlCu and Al2Cu, which has a greater impact on the properties and performance of the composites. The thermal expansion coefficient is significantly reduced due to the appearance of new phases AlCu and Al2Cu in the matrix. Compared with the SiCp/2024 Al composite without copper plating, the relative densities of the material after copper plating are 99.15%, which is increased by 1.57%. The coefficients of thermal expansion are 5.73×10-6 K-1, which is reduced by 32.4%. The flexural strength are 283 MPa, which is reduced by 10.2%.关键词：Metal-matrix Composites;Cu-coated;SiCp;AlCu;Thermal Expansion
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发布时间：2023-12-18 - 摘要：The partial surface shot peening process was introduced to the low pressure casting A365 aluminum alloy steering knuckle. The effects of distribution of surface residual stress and the heat temperature on the alloy as well as the microhardness were tested and analyzed. The cross-section microstructure of the shot peening section was observed. The results indicate that the eutectic Si grains in the surface microstructure is refined and the surface hardness of aluminum alloy is improved significantly by shot peening. In the range of 0～30 min, the hardness of the aluminum alloy surface is increased gradually with the extension of the shot peening time. When the shot peening time is 30 min, the surface hardness is about 230 HV, which is about 1.35 times higher than that of the center material. Considering that the shot peening effect disappears over 100 ℃, it is not recommended that the working temperature of the casting after shot peening exceed 100 ℃.关键词：A365 Aluminum Alloy;Shot Peening Treatment;Microhardness;Heat Treatment
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发布时间：2023-12-18 - 摘要：The MagMa software was used to simulate and analyze the low pressure casting process of the L-shaped positioning support body, and to predict the location and size of the defects easy to appear in the castings. The simulation results show that during the whole filling process of the castings, the molten aluminum flows smoothly, and there exists absence of entraipped-gas or cold shut. Through cutting the middle surface, absence of casting defects such as porosity and shrinkage could be observed, showing reasonale pouring system design. Through small batch production verification, the appearance of the product meets the requirements of the drawing, and the product qualification rate is more than 98%.关键词：Low Pressure Casting;Aluminum Alloy Positioning Support Body;Numerical Simulation
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发布时间：2023-12-18 - 摘要：The influence of lanthanum oxide contents on the properties of barium zirconate based ceramic cores were investigated by adjusting addition of lanthanum oxide. The results indicate that as the addition of lanthanum oxide increases, the linear shrinkage and bulk density of the core specimens are gradually decreased, and the apparent porosity is gradually increased, meanwhile the bending strength is gradually declined, and the high temperature deflection is firstly decreased and then increased. When the content of lanthanum oxide is 5%, the core specimens have an excellent high temperature deformation resistance with sufficient bending strength.关键词：Barium Zirconate Based Ceramic Cores;Lanthanum Oxide;Microstructure;Properties
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发布时间：2023-12-18 - 摘要：According to the shrinkage porosity and cavity in ZL107 aluminum alloy intake pipe during the tilting casting and numerical simulation on ProCAST, the tilting casting process was optimized by orthogonal numerical simulation experiments to eliminate these defects. The results indicate that the influence of factors on shrinkage porosity present as follows: mould preheating temperature>pouring temperature>tilting speed>gate cup preheating temperature. The optimized tilting casting process parameters are as follows: pouring temperature of 740 ℃, preheating temperature of 400 ℃ and 350 ℃ for upper and lower mould, respectively, mould tilting speed of 9.0°/s, preheating temperature of gate cup of 300 ℃. After chilling the thick wall, modifying structure of riser system and insulation, the numerical simulation reveals that the solidification sequence of the casting is reasonable, and the shrinkage porosity and cavity disappear after optimizing, which is verified by practical production.关键词：ZL107 Aluminum Alloy Intake Pipe;Tilting Casting;Orthogonal Experiment;Process Optimization
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发布时间：2023-12-18 - 摘要：With the more frequently reconstruction and expansion of municipal pipeline engineering, it is urgent to solve the problems of water leakage and opening holes in the process of pipeline construction. The structure of saddle-type pipe clamp products was designed and trial production was carried out by Dongjiu line, static pressure line and lost foam technology. Through type test and the project application, the performance and structure of products all meet the design requirements, solving the problems of slow repair and low construction efficiency, saving construction cost, which also meet the requirements of customers.关键词：Pipeline Plugging;Lost Foam Casting;Saddle-type Pipe Clamp
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发布时间：2023-12-18 - 摘要：Art casting is a project that combines art and technology. 3 D technology plays a very important role in the development of art casting industry. The meaning of 3 D technology was analyzed and explained firstly, and the present situation of art casting field and the application of 3 D technology in our country were emphatically discussed. Finally, the existing problems and future development trend of 3 D printing technology were pointed out.关键词：Art Casting;3D Technology;Smart Manufacturing
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发布时间：2023-12-18 - 摘要：The relationship between the precise pronunciation and the alloy proportion, remaking model, adjusting wax mold, controlling melting, cutting file grinding and other techniques of the bell in the restoration casting process of the bell unearthed from the No.1 Han Tomb in Dayunshan in Xuyi, Jiangsu Province was analyzed by the methods of observation and experiment, which is of practical significance to investigate the size, pronunciation mechanism, tuning methods and the lost double-tone casting technology of Chinese bronze bell.关键词：Dayunshan Bell;Restoration;Music Performance
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发布时间：2023-12-18 - 摘要：<正>时间:2021年12月3-6日地点:南昌·嘉莱特精典国际酒店1.会议主办单位中国机械工程学会铸造分会《特种铸造及有色合金》杂志社（武汉）南昌航空大学2.会议承办单位《特种铸造及有色合金》杂志社（武汉）3.会议协办单位广州和德轻量化成型技术有限公司南昌大学中铸产业网4.会议支持单位fsc跨国铸造采购平台帕盛博（苏州）软件科技有限公司广州树森耐火制品有限公司5.会议时间2021年12月3-6日（因疫情影响,会议日期由8月3-6日延期到12月3-6日）6.会议地点南昌嘉莱特精典国际酒店（江西省南昌市八一大道2号）7.会议议程（1）12月3号全天报到（2）开幕式及代表合影（4日上午8:00-9:00）
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发布时间：2023-12-18 - 摘要：<正>2021年"第27届中国铸造协会消失模V法实型分会"年会,根据疫情形势预期于2021年7月～8月举办。为做好消失模V法实型铸造分会年会交流内容的组织工作,营造良好学术氛围,推动消失模铸造行业创新、协调、绿色、开放、共享发展,促进行业单位之间交流与合作,展示自身在技术研发、管理创新、生产实践方面等取得成果,现公开广泛征集年会论文。一、征文内容（所有铸造相关技术）1.消失模、V法、实型铸造的基本理论、基本原理、生产设备、检测设备与技术、试验与分析技术、生产应用技术、环保系统、原理与技术、
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发布时间：2023-12-18
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