最新刊期
卷 42 ， 期 6 ， 2022
- 摘要：Inducing secondary phase is one of effective means to improve the room temperature plasticity of amorphous alloy matrix composites. The amorphous alloys and their deformation characteristics were reviewed, and the fabrication process as well as mechanical properties of amorphous alloy matrix composites were summarized, including ex-situ particle/fiber reinforced, in-situ precipitated phase reinforced systems and Zr-based, Ti-based and Mg-based alloy systems. In addition, the latest developments on reinforcing phases and their fabrication process were introduced, including porous particles, shape memory phase, dealloying reaction in metallic melt, selective phase leaching process. Moreover, the microstructure, mechanical properties and optimization technologies of the above composites were expounded in detail, and the prospect was pointed out.关键词：Amorphous Alloy Matrix Composites;Mechanical Properties;Plasticity;Shear Band
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发布时间：2024-04-01 - 摘要：Mechanical vibration was utilized to strengthen bonding interface of the Al/Mg bimetallic composites. The effects of vibration frequency on the interfacial microstructure and mechanical properties of Al/Mg bimetallic composites by LFC solid-liquid composite casting were investigated. The results indicate that the vibration frequency has a significant effect on the interfacial microstructure and mechanical properties of Al/Mg bimetallic composites. With the increase of vibration frequency, the thickness of the intermetallic compound（IMCs） layer is decreased, resulting in the decrease of brittle phase of Al3Mg2 and Al12Mg17, and the Mg2Si phase at the interface is refined with a distribution change from agglomeration to dispersion. When the vibration frequency is 50 Hz, the shear strength of Al/Mg bimetallic composites reaches the maximum of 46.83 MPa, which is 47.13% higher than that of the Al/Mg bimetallic composites without vibration.关键词：Vibration Frequency;Al/Mg Bimetallic Composites;Interfacial Microstructure;Mechanical Properties
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发布时间：2024-04-01 - 摘要：The WC particle reinforced iron-based composites with prefabricated structure were prepared by sand casting process.The influence of different prefabricated column diameters on the microstructure and three-body abrasive wear properties of WC reinforced iron-based composites was investigated.The results indicate that when the preform diameter is 5mm and 10mm,an obvious transition layer is formed between the preform and the iron-based matrix.The microstructure of the composite is mainly composed of WC,Fe3W3C and M7C3carbides,and the hardness of the transition layer and preform zone is higher than that of the high chromium cast iron matrix.The composites with prefabricated column diameter of 10mm exhibit the lowest wear rate and the optimal wear resistance,where the wear morphologies are characterized by furrows and spalling.关键词：WC Particles;Iron-based Composite;Preform Column Diameter;Wear Resistance
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发布时间：2024-04-01 - 摘要：The solid-liquid compound method can produce bimetallic composites with complex internal structure, which has the characteristics of low production cost, simple processing technology, wide application range of alloys, low energy consumption, and high bonding strength of interface. The development and application of solid-liquid compound casting technology were reviewed, and the influence of process parameters on the interface quality of solid-liquid bimetallic castings was analyzed. Meanwhile, the interface microstructure, properties, and interface bonding mechanism of solid-liquid compound castings were expounded, and the research direction of solid-liquid compound casting bimetallic materials were prospected.关键词：Bimetallic Composites;Solid-liquid Compound Casting;Microstructure;Interface Bonding
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发布时间：2024-04-01 - 摘要：The aluminum/low carbon steel clad plate were fabricated by liquid-solid twin-roll casting, after annealing at 450 ℃ for 1.5 h and rolled for three passes. After each pass rolling treatment, the reduction rate of the clad plates reaches 25%, 35% and 45%, respectively. The microstructure was observed and the element distribution of the interface was analyzed by SEM and EDS. The failure process of the clad plates was observed by in-situ tension, and the tensile strength and elongation were tested. The results indicate that there exists a continuous diffusion layer at the interface of the annealed clad plates, and the diffusion layer is broken into blocks under the pressure of the twin roll. Moreover, the greater the reduction rate is, the thinner the diffusion layer is, and the smaller the blocks is. Obvious gaps and holes are observed at the interface with the reduction rate of 25% and 35%, which disappear when reduction rate reaches 45%. The main cracks on the A356 side of annealed clad plates are originated from eutectic silicon particles and segregated eutectic silicon particles, and that of clad plates with reduction rate of 45% are formed by the rapid propagation of small cracks in the aluminum matrix. The clad plates with reduction rate of 45% exhibit the optimal bonding strength of interface and desirable ability of coordinated deformation, where the tensile strength reaches 441 MPa, and the elongation is 3.03%.关键词：Aluminum/steel Clad Plates;Reduction Rate;Interface Microstructure;Mechanical Properties
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发布时间：2024-04-01 - 摘要：Magnesium alloys are widely used in the fields of automobiles,aerospace,and electronic communications due to the various excellent properties.However,the further development and application are limited owing to the poor mechanical properties at room temperature.The performances of the magnesium alloy can be significantly improved by virtue of grain refinement,which is beneficial to subsequent machining.Therefore,the recent development of the grain refinement theory on magnesium alloys as well as the influence of external particles on the grain refinement of magnesium alloys were reviewed.Firstly,the development and problems of traditional magnesium alloy grain refinement theory were expounded.Secondly,the influence and mechanism of external particles commonly used on the grain refinement of magnesium alloy were summarized.Finally,the future potential of high-content nanoparticles in the field of magnesium alloy grain refinement were prospected,providing a reference for further research and development of new and efficient magnesium alloy grain refinement technology.关键词：Magnesium Alloys;Grain Refinement;Nanoparticles;Refinement Theory
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发布时间：2024-04-01 - 摘要：Graphene/6063 aluminum matrix composite ingots with high thermal conductivity were prepared by mixing powder ball milling, pressing prefabricated blocks and melt casting. The composition, microstructure and defects of the composites were characterized by scanning electron microscopy, spark direct reading spectroscopy, X-ray diffraction and Raman spectroscopy, and the effects of graphene addition on the conductivity and thermal conductivity of the composites were analyzed. The results indicate that graphene can be fused into the aluminum matrix with a uniform distribution, and the electric conductivity and thermal conductivity are improved significantly. The thermal conductivity of 0.5 Gr/6063 composite is increased to 226.11 W/（m·K）, and the electrical conductivity is increased to 32.34 MS/m, which are increased by 16.0% and by 3.93%, respectively.关键词：Graphene;Aluminum Matrix Composites;Thermal Conductivity;Electrical Conductivity
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发布时间：2024-04-01 - 摘要：近日，伊之密“大而敏捷LEAP系列超大型压铸机7000t首发暨9 000t战略合作签约仪式”在佛山顺德举行。政府领导、行业专家、客户代表应邀出席本次活动，共同见证伊之密LEAP7000T超大型智能压铸机全球首发，见证伊之密与一汽铸造建立9 000t压铸整体解决方案的战略合作关系。
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发布时间：2024-04-01 - 摘要：近日，韩国大学发布了一项新的研究成果，可以提高镁阳极电池的安全性和可行性，以此替代锂离子电池。该研究团队利用操作数值成像分析，阐明了镁的生长行为，并通过在基底上涂覆少量金来显著抑制镁枝晶的生长。目前，锂离子电池应用广泛，但这类电池存在一些弊端，譬如，商用锂离子电池采用了昂贵的材料，包括锂和钴。此外，由于锂与水和氧气的反应性很强，锂离子电池的安全性是一个关键问题。
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发布时间：2024-04-01 - 摘要：财联社报道，一份欧盟执委会工作文件显示，欧盟政策制定者已启动一项举措，目标是在2025年前投资20亿欧元重启欧洲镁冶炼的生产，现至少有3家公司在从事相关项目。针对中国向欧盟供应的镁占欧盟镁总需求量的90%以上的现实情况，该文件在强调镁的重要性之余，提出了减少对中国这一主要生产国的依赖。欧盟委员会担心，
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发布时间：2024-04-01 - 摘要：2022年1～3月，世界广义的新能源汽车销量为299万辆。其中，混合动力达到92万辆，占比为31%。中国新能源汽车销量的世界占比为59%，表现优秀。
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发布时间：2024-04-01 - 摘要：据媒体报道，大众汽车后车身一体化铝压铸件样件下线。该铝压铸样件采用4 400t压铸机生产，为SSP平台开发，取代约30多个零部件，可以减重10kg。据了解，大众汽车后车身一体化压铸件是在为大众SSP平台推出的Trinity项目作准备。为了生产新一代电动汽车Trinity项目，大众将在德国沃尔夫斯堡建立一座全新的工厂。
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发布时间：2024-04-01 -
- 摘要：健全人格简而言之即为人格的正常和谐发展。社会与时代的飞速发展使人的思想呈多元多样趋势,培养大学生的健全社会人格就变得尤为重要。思想政治教育在大学生的人格塑造与培养上起至关重要的作用。现如今的思政教育也由简单说教变为注重学生人格塑造,注重学生人生观、价值观的培养,让学生在思政教育中理解人与社会的关系。铸造专业学生利用科技的发展和能力的提升实现与外界的广泛交流,但这个年纪的学生普遍存在认知不全、社交经验局限的障碍,因此思想政治教育课程作为教学管理的主要构成,帮助学生健全社会人格势在必行。铸造专业的学生因其专业特点相较其他专业而言有更多的社会实践机会,随之而来的也有更多的诱惑和管理上的不便,很多学生忽视了人格的培养,导致无法做出正确的决定与选择。例如,面对市场的不断变化,铸造专业的学生面临毕业就业压力,如何在生存压力下保持对市场敏锐观察以保证市场物质利益最大化便显得尤为重要。学生需要在思政教育中培养正确认知,进而达到应对持续变化市场需求的能力。以便指导学生建立正确的认知以及价值观,进而应对持续变化的市场经济需求。铸造专业塑造大学生健全社会人格,思政教育功不可没,只有帮助学生构建健康三观,教会学生诚实做人、善良做人、守信做人,才能更好地塑造铸造企业需要的人才,使得铸造专业的学生在竞争激烈的市场中胜出。
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发布时间：2024-04-01 - 摘要：近年来,随着国内工业化转型与升级速度的进一步加快,生产市场对先进生产工艺与生产设备的需求逐步加深,这不但为技术工程人员提出了全新的业务需求,也使得国内生产企业不得不实时地紧跟行业发展动态,以在生产水平与生产能力方面做出动态优化。同时,经济全球化与科技全球化进程的推进使得技术领域的发展逐步连成一个整体,各国家、各地区的工业生产部门不能再独立且封闭的研究或应用一门技术,而应紧跟时代发展趋势,并逐步融入全球化发展潮流。冶金机械领域作为当下工业社会中的重要组分,其不但需要为冶金领域提供钢铁及有色金属材料生产所必需的各类机械零件与设备组件,而且担负了为冶炼、铸造、轧制等重要工艺流程提供技术指导的重要角色。因此,如何实现冶金机械领域在当下时代的长期稳定发展,已然成了该领域管理人员与科研人员所共同关心的重要问题,而国际交流与合作便是实现这一目标所不可忽略的重要环节。
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发布时间：2024-04-01 - 摘要：随着全球化发展的快速推进,国际间技术交流与产业合作的不断深入,承载着我国重工业、航空、汽车及多门类学科发展基础的铸造专业人士与高校越来越重视专业英语的地位与作用。结合当下产业发展与市场情况,适应新时代科技延伸与审美意识、大众接受度的专业英语翻译课题被更多的学者关注并加以研究,为整个行业的发展与进步起到了积极的推动作用,同时也为吸引更多的学子投入其中的学习与创新提供了平台。一、近三年来我国铸造行业的整体发展态势铸造业是我国工业发展的基石与支柱,经过几代铸造人的奋斗与努力,自21世纪初以来我国铸造业无论是产量与市场消费都稳居全球首位,成为名副其实的铸造大国。但随着2010年以来国际市场竞争格局的迅速转变,我国对于宏观经济的调控政策缩紧,使得2015年铸造产量出现负增长,但随着近十年来我国加快发展基础工业、大力发展制造业以及在核心技术领域上的技术突破,全球市场份额快速提升,使得铸造业在短期内就走出了低谷,快速反弹。2019年至2021年间,国内铸造市场需求量呈逐年小幅增长,尤其是冶金、运输、汽车、重型机械设备智能制造市场表现强劲。国内铸造企业经过近十年的市场洗礼与淘汰,存续下来的企业综合实力普遍有所提升,先进材料及技术被广泛采纳,与国际研发机构与外资企业合作的铸造企业增多,参与国际投标与业务合作的趋势明显。截至2021年,我国铸造公司工商登记在册的约为17 000家,与美国、德国等工业化发达国家的企业数量基本相当。
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发布时间：2024-04-01 - 摘要：随着数字化技术与信息化技术的逐渐成熟,一个全新的信息交互时代已经来临,这不但使社会中信息的转播通路如雨后春笋般争相涌现,也使得信息的质量和信息的传播效率都相较以往有着巨大提升。举例而言,新媒体技术的出现与应用极大地改变了人类社会的生活方式,人们现如今能够通过电视、手机、网络、计算机等多种途径获取各式各样、风格迥异的信息,通过合理地使用这些信息,人们的物质财富与精神财富均得到了相应满足。然而,在为日常生活提供便利的同时,新媒体时代的到来也对人们的思想观念与价值理念造成了显著影响,而高校学生便是受此冲击的典型代表。以高职铸造专业学校为例,铸造专业高职院校作为培养铸造领域建设人才的重要基地,其担负着为我国铸造产业及相关铸造企业培养新时代人才的重要作用。因此,如何在新媒体时代充分利用好新兴技术,实现高校学生的政治思想教育与价值观建设,已然成为铸造领域领导者与高职院校教育管理人员所共同关心的重要问题,也只有灵活地运用新媒体这把“双刃剑”,铸造专业高职院校才能在根源上担负起培养时代新人的重要任务。一方面,铸造专业高职院校应当充分认识新媒体技术所带来的教育教学优势,并积极地将各类新兴新媒体技术应用在思政教育实践,以探索出全新的思政教学新方法、新策略和新举措。另一方面,铸造专业高职院校教师也应充分考虑新媒体技术可能带来的负面影响,进而在实际的教学过程中尽可能地避免其所带来的不稳定因素,这将为铸造专业高职院校的思政教学工作奠定重要的教育基础。
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发布时间：2024-04-01 - 摘要：在全球一体化的当下,世界各国的关系越来越密切,作为地球村的一员,任何国家都承担着自己的国际责任,国别间在各方面的往来也越来越密切。全球化不仅带动了全球工业的进步,也让相对落后的地区经济得到了发展。我国作为全球第二大经济体,尤其是当下疫情仍在扩散的情况下,更应担起大国责任,在基建行业、工业等领域发挥至关重要的作用,这其中铸造行业占比较大。对于任何领域来说,要充分融入全球化市场,就要具备良好的沟通和交流能力,当然,铸造行业也不例外,英语作为一种世界通用语言,在国与国之间的交流互通中担任着桥梁的角色,只有充分掌握好英语,培养好英语的听说读写译等各方面能力,才能真正把握当下的机遇,迎接未来的挑战,将铸造行业发展起来,实现国际化商贸和经营,在国际铸造业占领一席之地。
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发布时间：2024-04-01 - 摘要：近年来,随着我国经济发展水平与科学技术水平的高速发展,国内各领域、各行业的发展发生了翻天覆地的巨大变化,这一方面体现在国内生产技术与生产能力的不断提升与优化之中,另一方面也充分体现在国内人民的思想与文化生活之内。铸造行业及铸造相关企业作为我国工业社会中的重要组分,其在现代化的生产与制造过程中扮演了重要角色,铸造行业不但需要实现对上游原材料生产厂商与企业的有机整合,而且需要为下游精细加工与再生产、再制造企业提供必要的设备与工艺技术支持。因此,如何在新的历史时期实现传统铸造企业的转型与升级,已然成为当下工商业管理人员以及全体铸造企业从业者所最为关心的重要问题。只有保障了铸造企业在现代化社会的持续蓬勃发展势头,才能够在根源上为社会的建设与发展提供有力保障,并为相关企业的长期稳固进步增添一份新的动力。
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发布时间：2024-04-01 - 摘要：传统文化是一个国家、一个地区、一个民族在长期的发展中演变汇聚而形成的一种能够全面综合反映人文精神与民族风貌的文化,是历史上各种文化观念与思想形态的完全表征。其不但蕴含着历史发展长河中的种种物质意识、制度意识和精神意识,也是反映着对应人民在日常生活中的心得与体会。纵观世界发展与变化进程,中华文化的历史源远流长,中国传统文化精神博大精深,这一方面充分地体现了中华民族的思想变化与理念变革历程,另一方面也充分地展示了人文精神在各个历史发展时期的不同特色。传统文化元素是历史发展的一大重要产物,其不但映射着宝贵的中国文化精神,而且也是能够被充分应用实践的重要组分。在信息的快速流通、人际交往的日益密切的当下社会,人们越来越重视对这些传统文化元素的吸取与利用,以实现传统文化元素的再次发展与再度辉煌。得益于文化传媒产业与设计产业的蓬勃发展,越来越多的设计人员考虑将传统文化元素应用于设计实践,这不但包含了对传统文化元素图像、元素色彩、元素字体和元素材料的灵活使用,也囊括了对优秀文化精神的继承与传统。通过使用这些传统文化元素,我国的优秀人文精神与思想文化得到了有效地传播与推广,而这也使得世界上其他国家或民族有机会认识、了解和感悟到中华传统文化的独特魅力。
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发布时间：2024-04-01 - 摘要：Mg-7 Zn-1 Cu-0.3 Mn-xNd（x=0,0.1,0.3,0.5,%） magnesium alloys were designed. The as-cast microstructure of the alloys with different Nd contents and the evolution of semi-solid non-dendritic microstructure after isothermal heat treatment were observed by OM, XRD and SEM. The isothermal heat treatment process of Mg-7 Zn-1 Cu-0.3 Mn-0.3 Nd alloy was investigated and the evolution of semi-solid non-dendritic microstructure was analyzed. The results show that the as-cast microstructure of Mg-7 Zn-1 Cu-0.3 Mn-xNd alloy is mainly composed of α-Mg, Mg4Zn7, NdCu2 and CuMgZn phases. The desirable addition of Nd is 0.3%, where the satisfied grain refinement effect can be obtianed, and the eutectic microstructure is more dispersed. The optimal semi-solid non-dendritic microstructure of Mg-7 Zn-1 Cu-0.3 Mn-0.3 Nd alloy can be obtained after holding at 595 ℃ for 30 min. The solid fraction, shape factor and average particle size reach 57.59%, 1.38 and 44.56 μm, respectively. The evolution of non-dendritic microstructure consists of the initial coarsening, structure separation, spheroidization, and final coarsening.关键词：Mg-7Zn-1Cu-0.3Mn-xNd Alloy;Isothermal Heat Treatment;Semi-solid;Evolution Mechanism
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发布时间：2024-04-01 - 摘要：Al-4.4 Cu-1.5 Mg-0.15 Zr alloy was selected and added with 0.1% Pr, 0.1% Sm and 0.1% Y, respectively. The working mechanism of rare earth elements on the alloy was investigated by SEM, EDS and XRD. The results indicate that the microstructure of alloys with 0.1% Sm, Pr and Y are refined in different degrees compared with that of the matrix alloy, where the secondary dendrite spacing is decreased, and the defects such as holes in the alloy are reduced. The Al3Pr, Al10Cu7Sm2 and Al6Cu6Y phases are formed at grain boundaries, respectively. The alloy with 0.1% Pr addition has desirable refinement effect, where the secondary dendrite spacing is the least, and the rare earth compounds are most evenly distributed at grain boundaries.关键词：Al-Cu Alloy;Rare Earth Elements;Microstructure and Morphology;Refining Effect
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发布时间：2024-04-01 - 摘要：Aluminum alloys are widely used in aerospace, automobile manufacturing and other fields as a common lightweight alloy. The fatigue performance, however, always restricts the application of aluminum alloy. In order to ensure the durability and safety of structural parts of aluminum alloy, it is of great significance to understand the fatigue behavior of aluminum alloy in depth and systematically. The fatigue performance of common aluminum alloys was described from the fatigue performance mechanism of aluminum alloys. The effects of the microstructure, applied load, working environment on fatigue properties of aluminum alloys were expounded, and the methods to enhance the fatigue properties of aluminum alloys were summarized, including alloying, heat treatment and surface strengthening. Finally, the future tendency on aluminum alloy fatigue was prospected.关键词：Aluminum Alloy;Fatigue Properties;Crack Initiation;Crack Propagation;Strengthening Methods
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发布时间：2024-04-01 - 摘要：The melting behavior, mechanical properties, spreadability, electrical and thermal conductivity, stability and reliability were analyzed, and the characteristics as well as the defects were summarized. Moreover, the modified plans and results made by relevant scientific researchers in response to these drawbacks were introduced, aiming to provide reference for the design and development of high-temperature lead-free solder.关键词：High Temperature Lead-free Solder;Alloy Design;Mechanical Property;Brazing Performance
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发布时间：2024-04-01 - 摘要：Closed-cell aluminum foam has excellent characteristics, such as light weight, high specific strength, high specific stiffness, flame retardancy, energy absorption and vibration damping, sound insulation, which has a broad prospect in transportation, aerospace, architecture and other fields. Melt foaming method is widely used in industry for preparing closed-cell aluminum foam. Nevertheless, there still exists problems including poor bubble stability in the foaming stage and high cost in closed-cell aluminum foam fabricated by melt foaming method. On this basis, main process factors affecting pore structure of closed-cell aluminum foam were discussed. The characteristics of common thickening and foaming agents were summarized. The influence law of thickening, foaming and freezing process parameters on porosity and pore diameter of closed-cell aluminum foam were analyzed. Finally, the process of preparing closed-cell aluminum foam by melt foaming method was prospected.关键词：Closed-cell Aluminum Foam;Melt Foaming Method;Process;Pore Structure
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发布时间：2024-04-01 - 摘要：Based on the cellular automaton model and GPU parallel computing technology, the cellular automaton computing model for dendritic growth during the solidification process was realized on a single GPU card. Taking Al-Cu binary alloy as object, the single equiaxed crystal growth process and columnar crystal growth process were numerically simulated. With the increase of undercooling degree, secondary and tertiary dendrite arms are gradually developed in equiaxed dendrite, where the secondary dendrite arms of non-preferentially oriented dendrites are blocked by the preferentially oriented dendrites during directionally solidified dendrite competition growth, which is then eliminated. Comparison of the calculation speed with the CPU-based parallel model verifies the acceleration effect of the GPU-based calculation model, indicating that the speedup ratio can reach up to 10.90.关键词：GPU Computing;Cellular Automaton;Dendritic Growth;Numerical Simulation
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发布时间：2024-04-01 - 摘要：Al-Cu-Li-Sc-Zr alloys with different Mg contents were prepared by vacuum induction melting. The effects of Mg content on the microstructure and properties of the alloy were investigated by OM, XRD, SEM and EDS. The results indicate that after Mg addition, the acicular AlLi phase in the alloy is decreased gradually with forming a new Al2MgLi eutectic phase, and the grain size of the alloy is decreased continuously. However, when the Mg content is excessive, the coarse eutectic phase at the grain boundary is increased continuously, which is adverse to the mechanical properties of the alloy. With the increase of Mg content, the strength of alloy is increased firstly and then decreased. In addition, Mg has a certain effect on the fracture mode of the alloy, resulting in the decrease of the plasticity. The hardness and tensile strength of the alloy are further improved by solution treatment, which significantly enhance the plasticity, while the yield strength is decreased due to the dissolution of strengthening phase. When the addition of Mg is 1%, the Al-Li alloy in solid solution state exhibits desirable comprehensive mechanical properties, where the hardness, tensile strength, yield strength and elongation of the alloy reach up to 131.1 HV, 432.7 MPa, 267.4 MPa and 7.62%, respectively.关键词：Al-Li Alloy;Vacuum Casting;Microstructure;Mechanical Properties
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发布时间：2024-04-01 - 摘要：The effects of Si, Fe, Mn, Sr and T2 heat treatment on the microstructure and properties of high thermal conductivity aluminum alloy were investigated by metallographic microscope, scanning electron microscope, laser thermal conductivity meter and digital conductivity meter. The results indicate that the increase of Si, Fe and Mn contents has a negative effect on the thermal conductivity and electric conductivity of aluminum alloy, since the lamellar eutectic silicon, the long needle-like β-Fe phase and the lamellar Al-Mn phase hindering energy transfer dominated by electron. The solution of Si leads to the decrease of thermal conductivity and electric conductivity, while T2 heat treatment can reduce the adverse effect of lattice distortion and improve the thermal conductivity of the alloy. The eutectic silicon phase can be effectively refined by Sr. When the content of Sr is 0.03%, thermal conductivity of the aluminum alloy reaches the maximum of 200.7 W/（m·K） and the conductivity is 26.53 MS/m. The Al-6 Si-0.8 Fe-0.0075 Sr alloy was applied to heat sink die castings, where the as-cast thermal conductivity reaches over 173.43 W/（m·K）, and up to 212.86 W/（m·K） after T2 heat treatment.关键词：High Thermal Conductivity Aluminum Alloy;Thermal Conductivity;Electrical Conductivity
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发布时间：2024-04-01 - 摘要：The effects of trace rare earth alloying on the oxidation kinetics and oxide film characteristics of AZ80magnesium alloy were analyzed at high temperature.AZ80,AZ80-0.32Y,AZ80-0.47Gd and AZ80-0.38Nd（mass fraction,%）alloy were prepared by melting and casting method.Melting point of the second phase in the alloy was measured,and the isothermal oxidation experiment was carried out.The as-cast microstructure and the oxide film of the alloy were observed.The results reveal that the addition of trace rare earth elements cannot increase the melting point ofβ-Mg17Al12phase,however the high temperature melting point phases of Al2Y,Al2Gd and Al2Nd are generated in the matrix,which eliminate theβphase to some extent and improve the high temperature oxidation resistance of AZ80magnesium alloy.Moreover the addition of rare earth elements can improve the oxidation film formation of the alloy and promote the densification of the oxide layer.关键词：AZ80Magnesium Alloy;Rare Earth;High-temperature Oxidation;Oxidation Kinetics
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发布时间：2024-04-01 - 摘要：2120 duplex stainless steel（DSS） with and without 0.1% niobium content were prepared by investment casting. The pitting resistance and its influence law of the steel in 3.5% NaCl solution at different temperatures were investigated by electrochemical corrosion methods including potentiodynamic polarization curve test and electrochemical impedance spectroscopy test, combined with optical microscope, scanning electron microscope, and energy spectrum analysis. The results indicate that the stability of surface passivation film of both steels is decreased with the increase of temperature. Meanwhile, the pitting potential is reduced, while the self-corrosion current density is increased. The content of α is increased with niobium-rich phase precipitated in the matrix after Nb addition, and dimension of corrosion hole on the stainless steel surface is expanded with temperature increase.关键词：2120 Duplex Stainless Steel;Niobium Alloying;Temperature;Pit Corrosion
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发布时间：2024-04-01 - 摘要：Mg-Zn-Sn alloys with different contents of Zn and Sn were prepared by metal mold,and the as-cast structure and mechanical properties of the alloys were investigated.The results show that the morphology of the grains is changed from columnar to equiaxed and the equiaxed grain size as well as the secondary dendrite spacing is decreased as the element content increases when the total mass fraction of Zn and Sn is less than or equal to 6%due to the value of GRF（Growth restriction factor）increases.However the amount of second-phase MgZn and/or Mg2Sn is increased with Zn and Sn content increasing.The yield strength and compressive strength of the alloy are increased with the content of Zn and Sn increasing,however the compressive rate of the alloys reaches the highest values at 2%Zn and 2%Sn,which is attributed to the finer and uniform distribution of Mg2Sn and MgZn phases at the grain boundaries,thus improving the plasticity.关键词：Mg-Zn-Sn Alloys;As-cast Microstructure;Mechanical Properties
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发布时间：2024-04-01 - 摘要：The influence of different heat treatment processes on the mechanical properties of Cu-Cr-Zr alloy was investigated. The results indicate that alloy after hot forging-solution-aging-cold working process exhibit the satisfied performance, where the tensile strength, yield strength, elongation, electrical conductivity and yield ratio are 515 MPa, 507 MPa, 15%, 47.096 MS/m and 0.920～0.984, respectively. The softening temperature is 620～640 ℃ under different heat treatment processes, and the lowest elongation is achieved at 200～400 ℃.关键词：Heat Treatment;Soften Temperature;Yield Ratio;Elongation
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发布时间：2024-04-01 - 摘要：Roller die technology substituted for drawing die of tungsten steel was utilized to draw copper alloy strip. The structure of roller die with long service life, high precision and reliability was designed combined with coiling or chain drawing machine to drawing copper alloy strip. The results indicate that the surface quality and flatness of copper alloy strip can be significantly improved by roller die technology, and the energy saving is about 22%. Compared with rolling mill, the roller die with simple structure is convenient to maintain and adjust, and roll dies with different hole patterns can be suitable for a variety of specifications of Cu alloy strip.关键词：Copper Alloy Strip;Drawing Die of Tungsten Steel;Surface Defect;Roller Die
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发布时间：2024-04-01 - 摘要：The effects of aging temperature and processing amount on hardness, conductivity and tensile strength of Cu-Cr-Zr alloy wire rod prepared by “non-vacuum up-casting+continuous extrusion” process were investigated by aging treatment and cold working test. The results indicate that with the increase of aging temperature, the hardness and tensile strength of Cu-Cr-Zr alloy wire rod before softening suffering continuous extrusion and diameter reduction are gradually increased and then decreased, while the conductivity is increased and eventually tend to stable. The hardness and strength before softening of Cu-Cr-Zr alloy wire rod after continuous extrusion+drawing reduction+aging is gradually increased with the increase of processing amount, while the hardness after softening and conductivity before softening remain stable.关键词：Continuous Extrusion;Cu-Cr-Zr Alloy;Aging Treatment Temperature;Processing Amount
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发布时间：2024-04-01 - 摘要：The temperature field and stress field of a thin-walled complex titanium alloy casting was simulated by numerical simulation technology, and the casting process suitable for the casting was determined. The temperature field distribution simulated by the scheme is relatively uniform, which is conductive to the balanced solidification of the casting. Internal quality reaches optimal, and the simulated stress field distribution is relatively uniform with the lowest stress difference in the whole casting. According to the simulation results, riser feeding is adopted for the parts with large wall thickness radio. High quality castings which are consistent with the simulation results and meet the technical requirements are effectively produced by optimized casting process.关键词：Numerical Simulation;Titanium Alloy Casting;Casting Process
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发布时间：2024-04-01 - 摘要：The internal radial deformation of injection mechanism can induce the fit clearance change between the punch and the pressure chamber, which is the main reason for the failure of the injection mechanism. Taking 1 250 kN hot chamber die casting machine as the research object, the thermal deformation and thermal coupling analysis during the injection process were verified comparatively based on the liquid-solid coupling. The results indicate that the heat generated by metal solution is transferred to the pressure chamber and gooseneck pot of the injection mechanism, which causes internal radial deformation, leading to the failure of the injection mechanism. On this basis, the structural optimization design was carried out, and the deformation and weight of the optimized injection mechanism were improved.关键词：Hot Chamber Die Casting;Injection Mechanism;Thermal Coupling;Optimization Design
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发布时间：2024-04-01 - 摘要：Ancient Chinese bronze were prevailed from the pre-Qin Dynasty. A large number of bronze artifacts unearthed in modern times were mainly fabricated by clay mold casting. Through the research on the forming process and clay formula of ancient Chinese bronzes by clay mold casting, the restoration experiment of the ancient formula was carried out, and the shell mold formular and forming process were optimized by modern materials on the basis of inheriting the ancient method, so as to provide technical parameters for modern clay mold casting, achieving the purpose of promoting clay mold casting.关键词：Ancient Chinese Bronzes;Clay Mold Casting;Adhesive;Ancient Restoration;Optimized Formula
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发布时间：2024-04-01 - 摘要：各种（黑色和有色合金）特种铸造方法、各种有色合金（包括新能源材料、高熵合金、金属玻璃等）及复合材料的理论、工艺、设备、测试与控制、计算机应用等方面的科技成果、生产技术和现场经验，以及上述内容的国内外发展动向、行业活动、学术会议消息等。广告业务范围（1）铸造合金材料；（2）铸造原辅材料；（3）熔炼设备；（4）铸造机械；（5）铸造生产线；（6）铸造模具；（7）铸造仪器仪表；（8）计算机软件、控制设备等。
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发布时间：2024-04-01
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