最新刊期
      卷 42 ， 期 3 ， 2022
      • Vol. 42, Issue 3, Pages: 261(2022)
        摘要：<正>1、会议主办单位中国机械工程学会铸造分会中国兵工学会材料科学与技术专业委员会中国机械工程学会塑性工程分会《特种铸造及有色合金》杂志社（武汉）2、会议承办单位《特种铸造及有色合金》杂志社（武汉）3、会议地点待定4、会议时间2022年秋季（11月前后,具体时间待定）5、征文内容与压铸（包含高真空压铸,局部加压）、低压铸造、挤压铸造、差压铸造、半固态加工相关的论文(含生产技术、企业管理、产业分析、市场动态、  
          
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        发布时间：2024-02-28
      • Jiao Wenna,Lu Yiping,Cao Zhiqiang,Wang Tongmin,Li Tingju,Yin Guomao
        Vol. 42, Issue 3, Pages: 265-274(2022) DOI: 10.15980/j.tzzz.2022.03.001
        摘要：Eutectic high entropy alloys（EHEA）, as one of the most potential high entropy alloys（HEAs） for industrial application due to the excellent comprehensive mechanical properties and desirable castability, have become a hot spot in the research field of high-entropy alloys. The latest research progress in the EHEAs was summarized, and the phase constitutes, microstructure, mechanical properties and methods of designing EHEAs were described in detail. Finally, the challenges of EHEAs were pointed out and the development direction of eutectic high entropy alloys was prospected.  
        关键词：EHEAs;Microstructure;Mechanical Properties;Composition Design   
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      • Vol. 42, Issue 3, Pages: 291(2022)
        摘要：<正>2021年初，工业级3D打印领航企业华曙高科与中国奥林匹克委员会奥运会备战办公室签署协议，采用金属3D打印技术为参加北京冬奥会的中国短道速滑队提供装备优化解决方案，为运动员量身定制轻量化、个性化新型短道速滑冰刀，为国家队征战2022北京冬奥会贡献出一份力量。华曙研发团队通过分析运动员在短道速滑转弯中的动作，采集运动员作用在冰刀上的数据，得出冰刀受力工况，  
          
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        发布时间：2024-02-28
      • Li Zhongtao,Xu Jingru,Zhang Weidong,Wu Zhenggang
        Vol. 42, Issue 3, Pages: 275-281(2022) DOI: 10.15980/j.tzzz.2022.03.002
        摘要：Welding research and weldability assessment of HEAs normally provide feedback information to adjust composition and pre-weld processing condition of the alloy. Herein the welding methods, process parameters, microstructural evolution, element distribution and mechanical properties of weld joint were briefly summarized starting from developped high entropy alloy systems. The correlation between the microstructure and mechanical properties of welding HEAs was reviewed. A future tendency on the research directions of welding behavior of HEAs was also proposed.  
        关键词：High Entropy Alloy;Welding Behavior;Welding Process;Joint Microstructure;Joint Properties   
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      • Vol. 42, Issue 3, Pages: 308(2022)
        摘要：<正>近日，新疆众和股份有限公司6N（99.999 9%）级以上超高纯铝研发成功，填补了国内空白。国际第三方检测机构法国图卢兹EAG实验室出具的检测分析报告显示，新疆众和提供的6N级以上超高纯铝样的关键微量元素均达到了ppb（浓度达到10亿分之1）级别，满足高端半导体生产技术工艺要求。6N级以上超高纯铝研发成功为我国高端半导体生产技术的发展提供了稳定可靠的超高纯铝材料，实现了超高纯铝提纯技术的突破。  
          
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        发布时间：2024-02-28
      • Song Zhikai,Wu Haoyu,Xu Kun,Long Wei,Zhou Xiaoping
        Vol. 42, Issue 3, Pages: 282-286(2022) DOI: 10.15980/j.tzzz.2022.03.003
        摘要：The Cu-10 Sn friction material was fabricated by powder metallurgy, and the influence of CoCrFeNiAl content on the structure and friction and wear properties of the composites was explored. The results indicate that different contents CoCrFeNiAl particles different contents with can coexist stably with Cu-10 Sn matrix particles, which presents mechanical bonding and metallurgical bonding. The hardness of the material without CoCrFeNiAl is the minimum, and both the friction coefficient and wear rate are greater with poor wear performance. As the content of CoCrFeNiAl increases, the hardness of the composites is increased greatly, and the friction coefficient and wear rate are firstly decreased and then increased. When the content of CoCrFeNiAl is 10% to 20%, the wear rate continues to decrease, and the friction coefficient is decreased significantly. When CoCrFeNiAl content reaches 30%, the wear rate of the composites is decreased to the minimum, and the friction coefficient is raised again, where the composites exhibit the highest hardness and the optimal wear performance, which is mainly attributed to the synergy between the added phase particles and the matrix.  
        关键词：Cu-10Sn Friction Materials;Powder Metallurgy;High-entropy Alloy;Microstructure   
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      • Vol. 42, Issue 3, Pages: 336(2022)
        摘要：<正>海关统计数据显示，2021年，中国累计出口各类镁产品47.78万t，比2020年增长了21.3%；累计出口金额19.36亿美元，同比增长101.2%。2021年，镁产品出口单价4052.3美元/t，同比增长65.8%。回顾历史数据，此前镁出口量的最高值是2017年的46万t。2021年，尽管中国镁行业与镁市场遭遇了诸多突如其来的外部冲击、压力和挑战，以及行业内部的多种变化和调整，但中国镁产品出口量、出口金额、出口单价均创历史最高水平。  
          
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      • Chen Ruirun,Zhang Shujing,Qin Gang,Gao Xuefeng,Liu Tong
        Vol. 42, Issue 3, Pages: 286-291(2022) DOI: 10.15980/j.tzzz.2022.03.004
        摘要：The effects of Y addition on the microstructure and mechanical properties of（CoCrFeMnNi） 100-xYx（x=0、1、2、3、4） high entropy alloys were investigated. The results indicate that the second phase of HCP structure rich in Y and Ni is formed with the increase of x to 2, presenting a long strip shape. When x=4, the HCP phase is distributed in a rectangular network shape, with the black Y-rich intermetallic compounds distributed. With the increase of Y content, the volume fraction of the second phase is increased gradually. The addition of Y promotes the atomic size difference and enthalpy-entropy ratio of the alloy, contributing to the formation of the second phase. The mechanical properties reveal that the compressive strength and microhardness are gradually increased with the increase of Y content. The yield strength and microhardness of（CoCrFeMnNi）96Y4 alloy are 521 MPa and 321.6 HV, which are increased by 178.6% and 100.6%, respectively, compared with those of the matrix CoCrFeMnNi alloy（187 MPa, 160.3 HV）. The enhancement of the strength and hardness of the alloys is mainly attributed to the increase of the volume fraction of the second phase in the entropy alloys.  
        关键词：High Entropy Alloy;Y Element;HCP Phase;Mechanical Properties   
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        发布时间：2024-02-28
      • Vol. 42, Issue 3, Pages: 341(2022)
        摘要：<正>一项行业调查结果显示，继发电行业之后，水泥、钢铁以及电解铝行业预计将在2023年前被纳入全国碳市场。全国碳市场的碳价也将会稳步上涨，预计由2022年的49元/t升至2025年的87元/t。此项调查由国际咨询公司ICF和北京中创碳投科技有限公司联合开展。中创碳投首席分析师林立身介绍，调查人员调查收集了来自不同行业的利益相关者的问卷417份，其中76%来自控排企业，有49%的受访者来自已经被纳入地区或全国碳市场的企业。  
          
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      • Xu Qin,Wang Qi,Li Juan,Zeng Ping,Fan Tanhao,Yin Yajun,Chen Ruirun
        Vol. 42, Issue 3, Pages: 292-296(2022) DOI: 10.15980/j.tzzz.2022.03.005
        摘要：(NbMoTiVSi0.2)100-xBx refractory high entropy alloy ingots with different addition of boron were prepared, and the phase constitution, microstructure and mechanical properties of the alloy were investigated. The results indicate that phase constitution of alloys remains stable after boron addition, which consists of BCC and silicide phase, and eutectic structure composed of the both phases are formed on the grain boundaries. The dendrite structure and eutectic structure of alloys are refined with boron content increasing, and the morphologies are converted from dendrite structure to near equiaxed grains. The yield strength of alloys is increased from 1 766 MPa to 2 076 MPa, the ultimate strength is increased from 2 091 MPa to 2 270 MPa, and the fracture strain is reduced from 16.47% to 13.33%. The strength of alloy is synergistically improved by grain refinement strengthening and solid solution strengthening, while plasticity improvement induced by grain refinement effect is unable to offset the plasticity decrease caused by the solid solution strengthening effect, therefore the plasticity is decreased with increase of boron.  
        关键词：Refractory High Entropy Alloy;Boron;Eutectic Structure;Microstructure;Mechanical Properties   
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      • Vol. 42, Issue 3, Pages: 370(2022)
        摘要：<正>2022年2月25日，宁波拓普集团股份有限公司（“拓普集团”）在杭州湾制造基地四期-轻合金九部工厂，为7 200t压铸岛一体化超大压铸后舱的量产举行了隆重的下线仪式。本次7 200t压铸岛生产的超大型结构件长宽分别近1 700mm和1 500mm。这也是目前汽车零部件领域超大型一体化铝合金压铸件之一，实现了15%～20%的减重效果。据介绍，该结构件将用于华人运通高合汽车，后者作为领先的科技车企，在一体化压铸技术上与拓普集团通力合作。通过该技术将几十个部件整合为一件，并一次铸造成形。  
          
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      • Zhang Nan,Gan Kefu,Li Zhiming
        Vol. 42, Issue 3, Pages: 296-308(2022) DOI: 10.15980/j.tzzz.2022.03.006
        摘要：High entropy alloys with a multi-principal element design, which can complement the traditional alloy design concept, are capable of achieving excellent comprehensive performance, thus presenting significant potential for practical applications in the industrial field. At present, many limitations still exist in the current research of high-entropy alloys, such as the time-consuming, high-cost R & D processes and the incomplete basic theories. Multi-scale modeling and simulation are playing a key role in material science, which can provide an efficient way for the design and micro-scale mechanistic study of high-entropy alloys. Applications of different multi-scale modeling and simulation methods in the research of high entropy alloys during the past years were reviewed, and some future research directions were also prospected.  
        关键词：High Entropy Alloys;Multi-scale;Calculation and Simulation   
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      • Vol. 42, Issue 3, Pages: 390(2022)
        摘要：<正>科技部高技术研究发展中心在北京通过视频会议的方式，组织专家对中国汽车工程学会承担的“十三五”国家重点研发计划“新能源汽车”重点专项“电动汽车结构轻量化共性关键技术研究与应用”项目进行了综合绩效评价。项目专家组根据负责人以及课题承担单位的汇报和答辩情况合议后，一致认为，“电动汽车结构轻量化共性关键技术研究与应用”项目围绕碳纤维复合材料、铝合金和镁合金、超高强度钢应用、全新架构电动汽车轻量化优化设计、异种材料连接、  
          
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      • Zhao Guangwei,Xu Guoxiong,Li Da,Fang Dong,Huang Caihua,Ye Yongsheng,Ye Xicong
        Vol. 42, Issue 3, Pages: 309-313(2022) DOI: 10.15980/j.tzzz.2022.03.007
        摘要：TiZrNbSnMo high entropy memory alloys were prepared by vacuum arc melting, and the effects of alloy composition on the microstructure, mechanical properties and superelasticity were investigated by XRD, SEM and cyclic compression. The results indicate that with the gradual substitution of Nb in the composition for Sn, the microstructure, mechanical properties and superelasticity of high entropy memory alloy are changed significantly. The main structure of Ti35Zr35Nb15Sn10Mo5 alloy is martensite α″, which exhibits higher strength, hardness and poor plasticity at room temperature. The maximum recoverable strain is 4.5%, and the elastic recovery accounts for about 80%. The main microstructure of Ti35Zr35Nb17.5Sn7.5Mo5 alloy is β-Ti, which exhibits low strength, hardness and desirable plasticity at room temperature. The maximum recoverable strain is 2.7%, and the superelasticity recovery accounts for about 30%. Ti35Zr35Nb20Sn5Mo5 alloy is composed of a mixed structure of fine martensite α″ and β-Ti, which exhibits the optimal superelasticity at room temperature. The maximum recoverable strain reaches 5%, and the superelasticity strain accounts for about 40%.  
        关键词：High Entropy Memory Alloy;Superelasticity;TiZrNbSnMo;Cyclic Compression   
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      • Vol. 42, Issue 3, Pages: 398-399(2022)
        摘要：<正>在我国的工业社会组成中,铸造行业与铸造相关企业一直是基础性产业,其不但需要高效的整合上游原材料生产厂商,为其提供清晰的供给导向与创新思路,也要全面地为下游制造厂家提供铸造工艺半成品、基础生产器械与部分铸造零件产品,而且还应为上下游产业提供适当的生产技术支持。面向于铸造业在我国工业生产体系中的重要作用,为进一步巩固铸造企业的核心地位,并有效推动铸造企业的产线升级,早日实现铸造工厂的生产自动化与智能化,不论是铸造领域科研学者、实际生产工人,乃至相关产业管理人员都实施了各式各样的创新方案与创新举措,  
          
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      • Vol. 42, Issue 3, Pages: 400-401(2022)
        摘要：<正>教育教学是培育人才的重要环节,教育质量的好坏与教学水平的高低将直接影响学生专业知识的学习效果和专业技能的掌握程度。前沿的教育理念与高质量的教学方案不但能够为学生提供必要的知识及技能帮助,而且能够帮助他们在学生时代便树立正确的世界观、价值观与人生观,而这也使得教育事业在我国的建设与发展中一直占有举足轻重的地位。同时,大学时代作为学生获取学术知识与专业技能的主要时期,其一直受到包括管理者、学生家长、学生本人在内的多方位关注。  
          
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      • Vol. 42, Issue 3, Pages: 402-403(2022)
        摘要：<正>我国基础建设行业与先进制造生产企业的发展为铸造行业及铸造相关企业提出了全新的发展需求,要求其不断提升生产效率、加大生产产量及产品质量,并满足日益丰富的特殊铸造任务。在这种发展背景下,铸造企业需要在现有生产能力的基础上不断提高企业的生产产能,包括提高工厂的日生产效率、增加工厂中铸造产线的数量、持续运转铸造设备作业等,这一方面对铸造企业的人力、物力投入提出了全新要求,另一方面也使得铸造工厂中的铸造生产设备不得不增加运转时长。  
          
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      • Vol. 42, Issue 3, Pages: 404-405(2022)
        摘要：<正>随着当前我国铸造行业快速发展、行业产值规模快速扩大,音乐教育对铸造行业企业精神文化具有什么样的影响已成为当前铸造行业学者研究的重点课题。铸造行业企业精神事关我国铸造行业发展水平、专业技能人才培养,事关铸造行业发展建设与国际化拓展,故此,依靠何种策略、何种方式、何种路径推进音乐教育全面融入铸造行业企业文化精神尤为迫切。一方面,音乐教育在人的精神文化培育中具有积极作用,不仅能帮助铸造行业企业员工树立正确的人生观、世界观、价值观,还能开发他们的创造性思维,使他们的情绪受到音乐文化、音乐氛围的影响,还能陶冶他们的情操、  
          
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      • Vol. 42, Issue 3, Pages: 406-407(2022)
        摘要：<正>一、语言经济学理论概述语言经济学者普遍认为语言经济学这一概念来源于马尔沙克,在其1965年发布的研究中阐述了语言的经济学概念,他认为语言在人类经济生活中扮演不可或缺的角色,同样具有价值、效用、费用和收益等其他资源共有的特性。之后很多经济学家通过人力资本理论和教育经济学相关理论将语言引入经济活动中来,探讨语言作为人力资本投入带来的经济效益。最终,在1996年,格林明确提出了语言经济学这一释义,通过将语言作为一种变量引入经济活动中,运用经济学方法探讨其与经济的关系。  
          
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      • Vol. 42, Issue 3, Pages: 408-409(2022)
        摘要：<正>随着我国教育系统的进步和发展,当今时代的大学生也越来越多,之所以能呈现我国的教育强大的这一景象,都离不开祖国的积极培养和教育制度的延伸,因此造就了新一代的年轻人,即为当代新青年。由于我国每年的高考制度的延伸,教育制度的完善,使得每年越来越多的考生进入到考大学的队伍,这一景象体现了我国教育的价值引领,但是当新时代大学生走入校园后,所面对的专业学习各不相同,这就要求授予学生专业知识的老师,可以在学习培养中更好的强化和锻造大学生的专业素养和知识,为进行课后的思想政治教育奠定基础,能够更好的做到新时代大学生的价值引领。  
          
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      • Vol. 42, Issue 3, Pages: 410-411(2022)
        摘要：<正>近年来,随着我国工业产能与工业生产水平的不断提高,国内各行业、各领域的生产效率突飞猛进,这不但创造了巨大的物质经济财富,也展示了我国作为工业生产大国的生产实力。在这种工业社会发展背景下,如何进一步提高生产质量、优化生产流程、提高生产工艺,并逐步实现自动化生产已然成为当下阶段社会所最为关心的问题。机械铸造产业与相关企业作为工业社会中重要一环,其产能与技术优越性不但关系到该行业的兴衰成败,也影响着我国能够在激烈的国际市场竞争中长期处于优势地位,因此,这些影响因素也使得机械铸造产业成为我国工业生产管理部门重点支持和发展的一类产业。  
          
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      • Vol. 42, Issue 3, Pages: 412-413(2022)
        摘要：<正>近年来,随着我国经济建设发展水平的飞速提升,国内各项基础建设不断完善,各类便民、利民设施的建设能力与建设技术也发生了巨大的变化。同时,随着科技水平与科研能力的不断提高,各类新兴建设建造技术逐渐成熟,并在很多行业得到充分应用,为社会的进一步发展与生活质量的进再一步优化做出了巨大贡献。其中,铸造行业与铸造相关企业,受到了经济与科技的共同发展与推动,并逐步实现了技术创新与生产革新,这使得越来越多优异的铸造方法与铸造技术争相涌现。  
          
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      • Vol. 42, Issue 3, Pages: 397(2022)
        摘要：<正>根据苏压协[2022]01号通知,协会年会暨中外压铸技术交流会因疫情暂缓召开,具体召开时间另行通知,为此,同步举行的论坛征文活动,调整为3月10日截止收稿。请各位投稿的行业人士抓紧时间将文章整理好,发送至协会秘书处。具体如下:会议时间:待定会议地点:待定主办单位:苏州市压铸技术协会协办单位:中国兵工学会挤压铸造专业委员会、中国铸造协会压铸分会、中国铸造协会挤压铸造专业委员会、香港铸造业总会、上海市压铸技术协会、  
          
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      • Zhang Haoze,Wang Junsheng,Huang Haiguang,Xiao Yongjiang,Zhong Hai
        Vol. 42, Issue 3, Pages: 314-318(2022) DOI: 10.15980/j.tzzz.2022.03.008
        摘要：Round ingot of TA31 alloy was melted by electron beam cold hearth furnace, and the chemical composition as well as the melting process were analyzed comparatively. The results indicate that the stability of axial composition in the ingot is significantly affected by melting speed. The axial Al content in the ingot is increased with the increase of melting speed, and vice versa. The reduction of melting speed fluctuation can improve the stability of Al content in ingot, and the distribution of Nb, Zr and Mo is uniform along the axial and radial direction. The test results and kinetic analysis reveal that the volatilization amount of Nb, Zr and Mo can be negligible. The volatilization of Ti and Al results in a slight increase of percentage content.  
        关键词：TA31 Titanium Alloy;Electron Beam Cold Hearth Melting;Element Volatilization;Composition Uniformity   
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      • Diao Aimin,Wang Jingpeng,Yang Yuqiu,Liu Jide,Guo Jingdong
        Vol. 42, Issue 3, Pages: 318-322(2022) DOI: 10.15980/j.tzzz.2022.03.009
        摘要：The fatigue damage recovery of 20 low carbon steel by pulse current as well as the mechanism were investigated. A pulse current was applied on the pre-fatigued specimens with 60% of the original fatigue life cycles to recover the fatigue damage, and the total fatigue life of the pulse current treated specimens is increased by 41% compared with the original ones. The effects of pulse current treatment on the microstructure and mechanical properties of the specimens were analyzed. The results reveal that absence of strengthing is observed in 20 low carbon steel under the action of pulse current, indicating that the prolongation of fatigue life is attributed to the recovery effect of pulse current. TEM observation reveals that after the pulse current treatment, the wall-like dislocation structure observed in ferrite of the fatigue specimens is partially disappeared, and the dislocation is more evenly distributed. Moreover, pulse current treatment may be an effective way to recover the micro-defects of fatigue-damaged materials, extending the service life of the materials.  
        关键词：Pulse Current;Fatigue Life;Damage Recovery;Steel   
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      • Song Dongfu,Zeng Qiang,Jia Yiwang,Xiang Jiafa,Zhang Weiwen
        Vol. 42, Issue 3, Pages: 323-329(2022) DOI: 10.15980/j.tzzz.2022.03.010
        摘要：The microstructure and mechanical properties of Al-Si-Zn-Mg alloys with different Zn contents were investigated by metallographic microscope（OM）, scanning electron microscope（SEM）, tensile testing machine and microhardness tester. The effects of Zn contents on aging precipitation behavior of Mg2Si phase in Al-Si-Mg alloy were analyzed by differential scanning calorimetry（DSC）, combined with Avrami-Johnson-Mehl（AJM） equation. The results indicate that peak aging strength and hardness of Al-Si-Zn-Mg alloys are gradually increased with the increase of Zn contents, while elongation is decreased and peak aging time is gradually shortened correspondingly. Zn is evenly distributed in the alloy, and addition of Zn has little effect on the microstructure, which, however, improves the precipitation activation energy of Mg-Si solute atomic clusters and G.P. zone by hindering the migration of Mg atoms to Si clusters, and accelerates the dissolution of Mg-Si solute atomic clusters and G.P. zone during the subsequent heating process, resulting in the dimension reduction of Mg-Si clusters. Furthermore, the lattice distortion energy of the matrix is increased, and the migration of Mg and Si atoms from the matrix to form more Mg-Si and Mg-Zn-Si clusters is promoted after Zn addition, which increase the nucleation particles of the β″ phase, promoting the precipitation of β″ phase and aging response rate.  
        关键词：Zn Contents;Al-Si-Zn-Mg Alloys;Precipitation Kinetics;Avrami-Johnson-Mehl   
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      • Li Shangmin,Yang Mingbo,Li Chunyu,Liu Yun,Song Jie,Cheng Renju,Liu Wenjun
        Vol. 42, Issue 3, Pages: 329-336(2022) DOI: 10.15980/j.tzzz.2022.03.011
        摘要：Mg-Al series alloys belong to potential magnesium alloys with low-cost. The modification of Mg-Al series alloys by alloying and micro-alloying is paid attention. The role and research status of rare earth elements in Mg-Al based alloys were reviewed, especially the effects of light rare earth elements（La, Ce, Pr, Nd and Sm）, heavy rare earth elements（Y, Gd, Dy, Ho, Er, Yb and Lu） and Sc elements on the microstructure, mechanical properties and corrosion resistance of Mg-Al series alloys, and the existing problems and future development about the modification of Mg-Al series alloys by rare earth elements were also pointed out.  
        关键词：Magnesium Alloys;Mg-Al Series Alloys;Rare-earth Elements   
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      • Hong Runzhou,Zuo Qiang,Fan Xueyi,Zhou Yongjiang,Zhang Zhe
        Vol. 42, Issue 3, Pages: 337-341(2022) DOI: 10.15980/j.tzzz.2022.03.012
        摘要：The types, binder and hardening mechanism of casting cores for aviation aluminum alloy were described. The mechanical properties, gas-evolution behavior, collapse characteristics and dimensional stability at high temperature were analyzed comparatively. Combining with the actual performance requirement of cores with different structure, the applicable scope of the different core materials was summarized, and applications were presented, meanwhile the development direction of core technology for the aviation aluminum alloy castings was prospected.  
        关键词：Aviation Aluminum Alloys;Intricate Structure Casting;Costing Casting   
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      • Bao Fangfang,Ding Xianfei,Gao Wei,Zong Xiao,Feng Xin,Nan Hai,Zhang Aibin
        Vol. 42, Issue 3, Pages: 342-345(2022) DOI: 10.15980/j.tzzz.2022.03.013
        摘要：The patents of directional solidification technology for titanium aluminum alloy were searched, extracted and analyzed to fully command the overall situation in the field. The trend of directional solidification technology for titanium aluminum alloy was revealed from the perspectives of patent overview, main innovation subjects and important patent analysis. The results indicate that the number of domestic patents of directional solidification technology for titanium aluminum alloy occupies a unique advantage. The majority of relevant research are mainly carried out in universities and enterprises. The hotspots focuse on titanium aluminum alloy and their preparation, covering alloy composition, single crystal preparation, mold shell preparation and other topics.  
        关键词：Ti-Al Alloy;Directional Solidification;Patent   
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      • Yan Bingdong,Mao Weimin,Yan Pengyu
        Vol. 42, Issue 3, Pages: 346-349(2022) DOI: 10.15980/j.tzzz.2022.03.014
        摘要：The semi-solid slurry of Al-27 Si-4.5 Cu-0.6 Mg alloy was prepared by a composite process of serpentine pouring channel（SPC） and Sr-modifier. The rheological die-casting was carried out. The effects of heat treatment on the properties and microstructure of the rheological die-casting samples with different Sr addition were investigated. The results show that primary Si and modified eutectic Si are fully refined by the composite process, and the rounded granular eutectic Si and primary Si with edges and angles passivated can be obtained after T6 treatment. The better the modification effect before heat treatment, the more rounded and finer the morphology of the obtained eutectic Si after heat treatment. Heat treatment further improves the tensile strength of semi-solid rheological die-casting samples of Al-27 Si-4.5 Cu-0.6 Mg alloy prepared by composite treatment, and the maximum tensile strength appears at the condition of 0.02% Sr content before and after heat treatment, which are 228.8 MPa and 254.7 MPa, respectively.  
        关键词：Al-27Si-4.5Cu-0.6Mg Alloy;T6 Treatment;Serpentine Pouring Channel;Rheological Die Casting;Eutectic Si   
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      • Li Pu,Pu Yi,Mou Yijie,Duan Shengqiu
        Vol. 42, Issue 3, Pages: 350-354(2022) DOI: 10.15980/j.tzzz.2022.03.015
        摘要：Copper-matrix/graphite（pure graphite/nickel-coated graphite） composites were prepared by sintering specimen in an atmosphere of N2 and H2 gas mixture. The effects of nickel coating on tribological, corrosive behavior and resistivity, hardness of the copper-matrix/graphite composites were investigated. The results indicate that nickel coating can significantly improve the interface bonding strength between copper-matrix and graphite. During the process of friction, graphite particles are difficult to be stripped out of the wear surface, so as to form a continuous and complete solid lubrication film, improving the wear reduction and wear resistance of the composites. Compared with that of pure graphite copper matrix composites, the wear rate of nickel-coated graphite composites can be reduced by about 70% under the same test conditions, which is increased gently with the increase of wear pressure. In addition, the existence of nickel in the coating can also enhance the hardness and corrosion resistance of the composites.  
        关键词：Copper-matrix/Graphite Composite;Nickel-coated Graphite;Friction Property;Corrosion Resistance   
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      • Xue Haihua,Zhang Quan
        Vol. 42, Issue 3, Pages: 355-359(2022) DOI: 10.15980/j.tzzz.2022.03.016
        摘要：The influence of oxidation treatment on the thermal conductivity, electrical conductivity and strength of the high volume fraction silicon carbide particle reinforced ZL101 aluminum matrix composites was investigated by thermal property test, DSC analysis and SEM. The results indicate that the microstructure of SiCp/ZL101 composites prepared by pressure infiltration method is dense and the reinforced particles are uniformly dispersed in aluminum matrix. The volume fraction of SiC particles in raw and oxidized SiCp/ZL101 composites reach 56.2% and 63.8%, respectively. The O element in the primary SiCp/ZL101 composites is concentrated in the local area of the aluminum matrix, which is mainly distributed around the SiCp particles in the oxidized one. Particle oxidation treatment can improve the thermal conductivity（increased by 15.6%）, and reduce the thermal expansion coefficient（decreased by 14.4%） of SiCp/ZL101 composites, which, however, can also sharply reduce the conductivity and strength of SiCp/ZL101 composites, decreased by 60.7% and 16.2%, respectively. The failure modes of SiCp/ZL101 aluminum matrix composites under bending are dominated by cleavage fracture of SiCp and ductile fracture of aluminum matrix.  
        关键词：Aluminum-based Composites;Oxidation Treatment;Mechanical Properties;Thermal Properties   
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      • Ren Jiakang,Mao Youwu,Wu Shusen,Zhang Yaohua,Wu Yuhan,Lü Shulin
        Vol. 42, Issue 3, Pages: 360-366(2022) DOI: 10.15980/j.tzzz.2022.03.017
        摘要：The modification effect of ZL115 aluminum alloy with different Sb contents at different holding time was investigated by rapid thermal analysis technology. The results indicate that the growth temperature(Teg) of the eutectic silicon is decreased by Sb addition of 0.1%～0.3%, which has 3.6～8.3 ℃ difference before modification, and a good corresponding relationship with the modification effect can be obtained. Desirable modification effect and the optimal mechanical properties of the ZL115 alloy were obtained with addition of 0.3%Sb, where the as-cast tensile strength and elongation are increased, reaching 208 MPa and 5.65%, respectively. The length of the eutectic silicon can be shortened with increasing in the holding time, while the longer holding time leads to the excessive Mg3Sb2 intermetallic, reducing the mechanical properties. Therefore, the desirable holding time is 60～90 min. The excessive eutectic silicon modification occurs when the Sb content exceeds 0.3%, and Mg3Sb2is generated under fast cooling rate.  
        关键词：ZL115 Alloy;Antimony Modification;Holding Time;Thermal Analysis;Eutectic Silicon   
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      • Yu Yibiao,Chen Leping,Xu Yong,Yuan Yuanping,Fang Senpeng
        Vol. 42, Issue 3, Pages: 366-370(2022) DOI: 10.15980/j.tzzz.2022.03.018
        摘要：The multi-step superplasticity tests of 2060 Al-Li alloy were carried out by using SANS CMT4104 tensile testing machine.The microstructure evolution and superplasticity properties of 2060 Al-Li alloy were investigated at deformation temperature of 425～500℃and prestrain of 10%to 30%.The results indicate that the elongation of the multi-step tensile specimen is increased with the increase of temperature,and increased firstly and then decreased with the increase of prestrain,which is greater than that of the single-step tensile specimen in the range of 450～500 ℃．The superplasticity is desirable when the deformation temperature is 500 ℃ and the prestrain is 20%,and the elongation reaches 211%.The interstitial insulation during multi-step tensile process leads to the decrease of flow stress,of which the degree is increased with the increase of the prestrain,and increased firstly and decreased with the increase of temperature.The peak stress at the second step tensile process is decreased significantly compared to that at single-step tensile process.The microstructure of the alloy reveals that a large number of dispersive phases appear at 425 ℃,and then dissolved into the matrix at 450 ℃ with zigzagshaped grain boundary.During 475℃to 500℃,the triangular second phase emerges in the matrix with a large number of dynamic recrystallized grains.  
        关键词：Multi-step Superplasticity;Al-Li Alloy;Microstructure   
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      • Wu Ling,Zhao Lei,Yu Ruihai,Zhou Zhe,Song Ligang,Yu Shuhong
        Vol. 42, Issue 3, Pages: 371-375(2022) DOI: 10.15980/j.tzzz.2022.03.019
        摘要：In order to verify the MIG welding process of A356 casting and 6082 profiles, experiments were carried out to provide experimental data. Firstly, tensile and three-point bending experiments were conducted to analyze the mechanical properties and bending resistance of welding under different processes. Meanwhile, the relationship between the welding current and welding-microporosity was obtained by tensile fracture analysis. Secondly, external and internal X-ray inspection were adopted to analyze the surface cracks and internal defects. Finally, the relationship between the welding current and the penetration were concluded by observing the penetration, providing quantitative data for the welding process. When the welding currents were 140, 150 and 160 A, respectively, the corresponding penetration depths were 0.79, 1.47 and 1.85 mm.  
        关键词：Aluminum Alloy;MIG Welding;Process Parameters;Experimental Methods   
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      • Ma Yilin,Fan Wenxin,Jia Yanfeng,Hou Junwei,Bao Jixuan,Li Jingfei
        Vol. 42, Issue 3, Pages: 376-379(2022) DOI: 10.15980/j.tzzz.2022.03.020
        摘要：The hot compression behavior of Cu-Ni-Sn alloy with deformation temperature of 650～850 ℃ and the strain rate of 0.001～1 s-1 was carried out on Gleeble-3800 thermal simulation testing machine. The high-temperature constitutive model of Cu-Ni-Sn alloy was constructed based on the stress-strain curves combined with the experimental data. The critical conditions of dynamic recrystallization were determined, and the volume fraction model was established based on Avrami equation.The results indicate that the constitutive model is well matched with the experimental results with the average relative error of 5.06%. The variation curve of dynamic recrystallization volume fraction with true strain is S-shaped, proving that the higher temperature and lower strain rate are favorable to the occurrence of dynamic recrystallization behavior.  
        关键词：Cu-Ni-Sn Alloy;Arrhenius Constitutive Model;Dynamic Recrystallization   
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      • Ren Bo,Liu Zhongxia,Zhang Guopeng,Shi Yunjia,Huang Hai,Cai Bin,Cheng Fangyong,Zhao Ruifeng
        Vol. 42, Issue 3, Pages: 380-384(2022) DOI: 10.15980/j.tzzz.2022.03.021
        摘要：The SAE1004 steel sheet with thickness of 0.7 mm and AA6111-T4 aluminum sheet with thickness of 0.1 mm were riveted with nail-free, and the joint quality was tested by the bottom thickness and resistance increment testing methods. The results indicate that the bottom thickness detection method of joint quality can reflect the degree of material deformation, which is insensitive to the negative effects induced by the pre-strain of the aluminum plate yet. The resistance of the joint can also reflect the degree of the material deformation, however, there exists a clearer correspondence between the increment of joint resistance and the bonding strength. When the bonding strength is decreased due to the increment of deformation resistance, the increment of resistance is also decreased due to the increment of the initial resistance. Therefore, the resistance increment method of joints is a appropriate reference value in the quality inspection of nailless riveted joints.  
        关键词：Steel-aluminum Sheet;Nailless Riveting;Bottom Thickness;Resistance Increment;Quality Inspection   
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      • Ding Xue,Wu Donghui
        Vol. 42, Issue 3, Pages: 384-390(2022) DOI: 10.15980/j.tzzz.2022.03.022
        摘要：In order to utilize the scale model to predict the forming process and internal quality of large thin-walled parts, a scale model was designed based on similarity theory and the effectiveness was verified. Numerical simulation and investment casting experiments were conducted to investigate the filling, solidification, hot tendency and internal quality of large thin-walled superalloy parts. The results indicate that the scale model can fully reflect the forming process and internal quality of the original large thin-walled superalloy parts, where the filling and solidification properties of the smooth thin wall connected by steel bar and seamless gate are identical. Moreover, the filling and solidification velocity is higher than that of the convex, while the trend in common. Therefore, it is proved that the combination of similarity theory, numerical simulation and actual experiment can effectively guide the production of large thin-walled superalloy parts, effectively reducing the development costs and improving yield rate.  
        关键词：Nickel-based Superalloy;Investment Casting;Physical Similarity;Numerical Simulation;Large Thin-walled Parts   
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      • Li Qiuxu,Sun Yongming,Wu Guangjian,Su Haizhang,Feng Dongfang
        Vol. 42, Issue 3, Pages: 391-393(2022) DOI: 10.15980/j.tzzz.2022.03.023
        摘要：In view of the deformation and deflection of the long core-pulling needle in the deep and high pressure oil channel hole of the gearbox side cover in die casting process, the effects of the die casting process, mold structure and the material of the core-pulling needle on the deformation and deflection were analyzed.The results show that the casting scheme and the selection of key process parameters are very important to reduce the deformation and deflection of the long core-pulling needle. The positioning stability of long core-pulling needle, the piecewise matching structure of needle and needle sleeve, and the high-pressure cooling structure can all reduce the possibility of deformation and deflection of long core-pulling needle. The long core-pulling needle which produced by high strength W360 material can reduce the possibility of deformation and deflection of the long core-pulling needle.  
        关键词：Die Casting Aluminum Alloys;Long Core-pulling Needle;Deformation;Deflection   
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      • Wang Guilin
        Vol. 42, Issue 3, Pages: 394-396(2022) DOI: 10.15980/j.tzzz.2022.03.024
        摘要：The failure of a die casting fixed core was described, such as ablation, crack and aluminization, and the causes of the failure was analyzed. Mould repair was divided into marking, welding, digital control milling and electrical discharge machining processes, and the quality of the repaired mould could meet the technical requirements. Meanwhile, the measures to improve the service life of die casting mould were discussed, including reasonable structure design of die casting mould, proper choice of die material, optimization of heat treatment process, proper operating environment and standard maintenance.  
        关键词：Die Casting Mould;Failure;Mould Repair;Service Life   
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