最新刊期
卷 42 ， 期 4 ， 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、营销策略、发展展望等）皆可应征。主要包括:①铝、镁、钛、锌、铜等合金及复合材料的组织,性能和应用;②压铸、低压铸造、挤压铸造、差压铸造、半固态加工工艺在生产中的具体应用;③压铸机、低压铸造机、挤压铸造机、差压铸造机、半固态加工设备的开发和应用;④压铸模具;⑤涂料、脱模剂;⑥熔炼、精炼;⑦CAD/CAM/CAE;⑧数值模拟;⑨检测及过程控制;⑩市场与管理。
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发布时间：2024-04-01 - 摘要：The research progress in aspects of the effects of chaotic advection induced by electromagnetic field on the solidified microstructure in semi-solid alloy was reviewed. The chaotic theory and its engineering application, as well as the application of the chaotic advection in the preparation of the semi-solid alloy were introduced. On this basis, the progress and the results achieved that apply the mathematical modeling to parse the chaotic advection during melt flow in semi-solid alloy were mainly expounded. Finally, the research advances on the effects of chaotic advection induced by electromagnetic field on solidified microstructure in semi-solid alloy were summarized, and the potential application and the main development direction were prospected.关键词：Electromagnetic Field;Semi-solid Alloy;Chaotic Advection;Solidified Microstructure
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发布时间：2024-04-01 - 摘要：A neural network model with multi-layer NALU algorithm for the prediction of microstructures of aluminum alloys was carried out. The principle and model of NALU algorithm were explained in detail, and the approaches of modeling and training for the prediction with local grain characteristics were introduced. A satisfying model can be trained with the combination of both optimization algorithm RMSProp and Adam, and appropriate adjustment of learning rate. Taking aluminum alloy casting as instance, 26 input factors including alloying elements, processing conditions as well as equipment parameters were concerned, and microstructure parameters containing 18 local grain characteristics were targeted. Hence a neural network model containing 4 layers of NALU algorithm was established with（26,32）、（32,28）、（28,23）、（23,18） as the number of input/output neurons. The mean square error for the trained network model reaches 0.000 6. Prediction error of average grain size of 8 groups of aluminum alloys under different conditions is less than 9%, suitable for intelligent prediction of microstructures and design of new aluminum alloys. The results indicate that it is feasible to construct an intelligent prediction model for the microstructure and properties of alloys by multiple-layer NALU. Multi-layer NALU neural network model can realize the intelligent prediction for exquisite expression of aluminum alloy microstructure by local grain characteristics.关键词：Deep Learning;Neural Network;NALU Algorithm;Intelligent Prediction
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发布时间：2024-04-01 - 摘要：国家市场监督管理总局和国家标准化管理委员会发布2022年第2号国家标准公告，万丰镁瑞丁新材料科技有限公司主持制定的GB/T 25747-2022《镁合金压铸件》正式发布，将于2022年10月1日正式实施。
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发布时间：2024-04-01 - 摘要：日前，国家科技管理信息系统公共服务平台公布了44个国家重点研发计划重点专项2022年度项目申报指南征求意见稿。其中，“高性能制造技术与重大装备”重点专项中的“一体化承载式车身压铸成形工艺与装备”入选。
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发布时间：2024-04-01 - 摘要：全国人大代表、中国工程院院士潘复生在北京接受采访时表示，“大力发展镁产业，有助于缓解我国战略资源短缺问题，有助于我国发展制约他人的高端产品，对增加我国经济社会发展竞争力、保障我国经济安全和战略资源安全和推动可持续发展有重要战略意义。”
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发布时间：2024-04-01 - 摘要：近几年，受益于各大厂商对轻薄化的极致追求和材料界的努力推动，镁锂合金也渐渐地被应用到轻薄笔记本中，并在轻量化和便携性方面取得重大进展，得到了市场的认可。从1982年Compaq推出第一台IBM兼容手提计算机开始，笔记本电脑已经陪伴人类40年，成为人们工作、学习、生活中的必需品。随着硬件和软件各类技术的发展，其功能、结构、应用也一直在变化，市场需求也不断变化。针对消费者对产品外观和便携性的追求，轻薄笔记本已成为各大笔记本电脑厂商纷纷布局的对象，轻薄、超便携成为笔记本电脑的发展趋势。
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发布时间：2024-04-01 - 摘要：近日，中国科学院合肥物质科学研究院与中国核动力研究设计院合作，研制出一种高性能钼合金，或可在先进核能系统和航空航天等领域应用。空间核反应堆具有环境适应性好、功率覆盖范围广、结构紧凑以及大功率条件下质量功率比小等突出特点，在大功率地球轨道卫星、深空探测以及月球行星基地供电等方面具有广阔的应用前景。空间堆中的包壳及堆芯结构材料面临高温、中子辐照及液态碱金属腐蚀等苛刻服役环境，是制约空间堆技术发展的瓶颈之一。钼及其合金由于高熔点、高热导率、与碱金属相容性好等特点，是空间堆关键候选材料，但纯钼存在室温塑性低、高温强度不足、再结晶脆性和辐照脆化等问题。
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发布时间：2024-04-01 - 摘要：镁-镍钛仿生复合材料——可提高阻尼减震性能近期，中外有关科研院所合作研发出一种新型镁-镍钛仿生复合材料，其不仅实现了镍钛合金同镁基体在性能优势上的互补与结合，且使材料拥有了自修复功能。据介绍，新型镁-镍钛仿生复合材料通过多重机制，分别提高了强度和阻尼性能，突破了两者之间的相互制约关系，实现了镁合金的强度、阻尼和能量吸收效率等多种性能的良好结合，甚至可比肩一些常用的高分子材料。其在减震、吸能、降噪等方面优势明显，有望成为精密仪器、航空航天等领域需求的新型阻尼减震材料。
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发布时间：2024-04-01 - 摘要：近日，海德鲁宣布与瑞典电动汽车制造商极星（Polestar）开展合作，联合研发气候中性汽车制造所需的零碳铝合金。气候中性是指温室气体净零排放。极星计划通过推动从供应商到零售商的全价值链协作，在2030年之前制造出真正的气候中性汽车，该计划是极星“Polestar 0”项目的一部分。极星首席执行官托马斯·英格拉思（Thomas Ingenlath）称：“海德鲁致力于发展低碳铝，并积极利用水电、风能、太阳能等可再生能源，能够帮助我们减少汽车生产和使用过程中的温室气体排放，是‘Polestar 0’项目的重要合作伙伴。”
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发布时间：2024-04-01 - 摘要：在现阶段的工业社会发展中,更高的产品质量以及更严格的行业要求给各行业的发展提出了崭新的要求,需要工业相关领域在其生产过程中不断向更为智能化与自动化的方向过渡与发展,同时还要求这些产业提供更高质量的产品,以满足日益增强的市场需求。铸造业及铸造业相关企业需要为上游具体产业提供原材料、工业半成品以及基本技术支持,还需要有效整合下游产业,使它们拧成一股绳共同满足时代生产需求。因此,面对铸造业进一步发展所提出的更高要求,铸造专业人才的培养已经成为业内人士最为关注的问题,其保证了铸造业领域的未来发展进程与发展速度,也为铸造行业的可持续发展提供源源不断的动力。在这一时代环境下,校企联合教育教学模式成为近几十年来最受欢迎的教学方式之一,其充分联合企业与高职院校的优势,共同培育符合企业工作需要的现代人才。
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发布时间：2024-04-01 - 摘要：近年来,我国经济水平与科技发展力量得到了巨大发展,各类新兴技术与高新设备的制造与创新层出不穷,这一方面展示了我国综合实力的进一步加强,另一方面也为工业生产和人民生活提供了巨大便利。在工业设备中,铸造行业与铸造相关企业为工业生产和制造做出了巨大贡献,其不但需要快速、高效整合上游原材料市场,保障基本原材料和生产能源的合理供给与分配,也需要为下游产品设计与生产企业提供铸造生产器械、工艺半成品,并提供一定的铸造生产技术支持。在这种工业发展背景下,进一步提高铸造行业及铸造相关企业的生产效率和产品质量已经成为了当下阶段该领域从业者所最为关注的重要问题。同时,在铸造产品的生产过程中,铸造工艺的先进性与高效性不仅与工厂生产效率和公司营收效益直接挂钩,也将直接关系到最终产品的质量与性能,因此,充分采用各类先进技术与先进设备优化铸造生产工艺便是实现铸造行业降本增效的关键所在。
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发布时间：2024-04-01 - 摘要：社会工业化水平不断提升的前提下,制造业企业对社会整体经济水平的发展具有积极的作用,铸造业对于社会工业化发展情况也具有重要的影响意义。新的社会形势下,在铸造专业教学课程的教学过程中,教师除了要让学生掌握基本的专业技能之外,还要对学生进行良好的心理健康教育,可以通过有效的校企结合视角进行高校铸造专业学生心理健康教育的对策提升,实现高校学生专业技能和心理素质的双重提高,为社会培养更多全面发展的人才,实现社会整体经济和文化水平的双重发展。
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发布时间：2024-04-01 - 摘要：后疫情时代,人们对于体育运动健身的意识提升,在日常生活中开展体育运动的锻炼频次也随之提高。羽毛球运动自诞生以来就颇受人们关注,一方面羽毛球运动是一项力量与技巧并重的体育运动,虽然没有直接的身体对抗但在赛制下显得相对激烈紧张,竞技感较强;另一方面,羽毛球运动开展受环境约束较小,特别是对于普通民众的日常运动活动而言,只需要一对羽毛球拍,在空地即可开展羽毛球运动,十分方便,普及性很高。作为一项全民参与的体育运动,其主要的体育器材也迎来了极为广泛的市场。伴随着社会科技与经济的高速发展,市面上有各式各样的羽毛球拍,以迎合职业以及非职业羽毛球运动的需求。不同材质的羽毛球拍对于击球过程中力量、速度的传输各不一样,加之运动者的使用技巧、方法的差异,此两者是羽毛球运动过程中运动员运动能力水平呈现差异的重要原因。镁铝合金羽毛球拍作为一种轻便合金材质,被广泛应用在羽毛球拍的铸造过程之中。拟从羽毛球拍材质进化历程入手,在探讨镁铝合金羽毛球拍铸造工艺特点与流程的基础上,研究其耐腐蚀性能以及力学性能。
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发布时间：2024-04-01 - 摘要：近年来,随着我国经济发展速度的不断加快,各类基础设施和基础风景建设不断完善,这不但提高了人民的日常生活水平,使人们的物质生活得到了极大满足,也相应地提升了人们对精神文化生活的进一步追求。同时,随着经济全球化与发展一体化趋势的加剧,各国人民的人口流动与人员往来日益密切,这为文化的传播与交融提供了一种全新途径,也使得各国家、各地区打造自身“文化名片”的重要性日益凸显。为充分迎合上述发展需求,城市规划与设计人员正逐渐将各类装饰与设计方案应用于城市景观的实际规划工作,以塑造每个城市的独特风景。
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发布时间：2024-04-01 - 摘要：高校教育体系创新与专业知识架构建设是我国近二十年高等教育深化改革的重要领域。国内各大高等院校在各专业领域中尝试进行新的教学模式试点教学,同时为适应新的社会及产业需要对现有专业的课程设计、知识结构体系、教育理念、实践课堂进行不断创新与突破,其目的就是为培养更多的适应于未来社会发展的技术及管理人才。我国高等教育中铸造专业的发展历史已逾七十年,最早可以追溯到建国之初的1952年。国内各工科院校的铸造专业为国民经济建设与工业发展输送了大量的专业技术人才,尤其是钢铁、机械、航空航天、国防军事、民用工业等各领域对于铸造专业技术的提升及实用型、高端型、研发型新人才的需求日益提升,因此铸造专业的知识体系的全面升级近在眉睫;同时铸造专业一改传统的课程式单一教育模式,力求在培养模式、课程优化、多维课堂、实操实践等方面的创新势在必行。
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发布时间：2024-04-01 - 摘要：铁画始创于清康熙年间安徽芜湖,芜湖铁画以其独特的设计风格、精湛的工艺彰显了其独特的审美风格,其代表作一般有:《迎客松》、铁画行书《沁源春雪》《长征诗》等。随着网络技术的迅猛发展,非遗芜湖铁画的铸造技巧和绘画技巧的融合面临着巨大的市场挑战。在当前的历史背景下,芜湖铁画的传承和蓬勃发展,必须进一步促进芜湖铁画的铸造技巧和绘画技巧的融合,使之可以在体现出原有的美术特色的基础上,进一步融入网络时代背景,突出现代符号,并通过产业化经济发展的形成,更加体现芜湖铁画这个国家非物质文化遗产的特殊价值。
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发布时间：2024-04-01 - 摘要：随着近年我国科学技术快速发展,我国铸造企业也逐步走出国门,走向全球,越来越多的铸造产品出口到全球各个国家,这也就无形中使得我国铸造企业与其他国家企业的沟通交流逐步增多,英语在铸造企业的应用逐步增多。随着当前铸造企业向着智能化、数字化、国际化方向的快速转型,就业导向型英语对铸造企业开拓海外市场具有什么样价值、什么样的作用已成为当前铸造行业英语学者研究的重点课题。就业导向型英语事关我国铸造企业的对外发展水平、发展质量与国际化拓展方向,故此依靠何种策略、何种方式、何种路径推进就业导向型英语全面融入铸造企业发展,培养高质量的英语应用型人才就显得至关重要。一方面就业导向型英语在帮助铸造企业国际化发展方面发挥着重要作用,不仅能拓宽铸造企业的海外沟通交流渠道,强化与不同国家、不同企业的战略合作,还能增强铸造企业员工的英语文化素质,使铸造企业员工能够熟练应用英语,使他们在英语交流沟通中积极拓展视野,丰富精神文化世界;另一方面,就业导向型英语以面向铸造企业专业英语应用型人才培养为第一目标,重视将多种英语文化元素、铸造行业专业英语术语、专业英语名词的融入,能在全面培育人才深度了解铸造行业发展特点、趋势、状态的前提下,引导中国铸造企业积极创新,参与国际竞争。可以说就业导向型英语是培育铸造企业对外沟通交流人才的重要方式,能在全面提升铸造企业员工英语文化素养的基础上,帮助铸造企业构建完善的英语文化交流体系,给铸造企业创新发展提供全面有效的文化支持。
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发布时间：2024-04-01 - 摘要：ADC12-0.9 Yb alloy was fabricated by high-energy ultrasonic casting, and the effects of solution treatment on the microstructure and wear resistance of the alloy were investigated. The results indicate that the solution effect of ADC12-0.9 Yb alloy is desirable with the solution at 520 ℃ for 1 h, and the silicon phase is spheroidized to a greater extent without coarsening. Under the conditions of the load of 60 N, the speed of 100 r/min, and the friction time of 15 min, the wear mechanism of the as-cast ADC12 alloy is dominated by spalling wear, and that of the as-cast ADC12-0.9 Yb alloy is mainly abrasive wear, followed by plastic deformation and adhesive wear. The wear mechanism of ADC12-0.9 Yb alloy by solution treatment（solid solution at 520 ℃ for 1 h） is dominated by abrasive wear, accompanied with plastic deformation.关键词：ADC12-0.9Yb Alloy;Solid Solution Treatment;Microstructure;Wear Mechanism
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发布时间：2024-04-01 - 摘要：Taking(Ti40.4Zr27.7Be15.6Cu63)（90+x）/90Nb10-x（x=0, 2, 4, 6, 8, 10, %） alloy as the research object, four kinds of Ti-based bulk metallic glass composites（BMGCs） reinforced by in-situ endogenetic β-phase dendrites were prepared. The phase composition, microstructure, mechanical properties and deformation behavior of Ti-based BMGCs were systematically analyzed through XRD, SEM and TEM. The results demonstrate that the volume fraction and dimension of the in-situ endogenetic β-phase dendrites in Ti-based BMGCs are increased with the increase of Nb content. The tensile results reveal that the yield strength and tensile strength of the composites are decreased with increasing dimension of the in-situ endogenetic β-phase dendrites, contrarily, the plastic deformation ability is enhanced significantly. Among these BMGCs, the mean yield strength, tensile strength and fracture strain of Ti40.4Zr27.7Be15.6Cu6.3Nb10 BMGC are 1 307 MPa, 1 428 MPa and 9.61%, respectively, indicating the excellent plastic deformation ability of the Ti-based BMGC.关键词：Ti-based BMGC;In-situ Endogenetic;Microstructure;Mechanical Properties;Deformation Behavior
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发布时间：2024-04-01 - 摘要：Current-carrying friction and wear is the result of coupling between electrical contact system and mechanical friction system. With the rapid development of technology, the service conditions of current-carrying friction materials become severer, therefore, it is particularly urgent to design and develop high-strength, high-conductivity, wear-resistant current-carrying friction pair materials. Copper matrix composite is a kind of high strength and high performance composite by adding different types of reinforcement phase into the copper or copper alloy matrix to control composition and structural properties. The composites can retain excellent properties of copper matrix such as high conductivity, and realize high temperature resistant, corrosion resistance, wear resistance and other excellent characteristics, which can be used as an ideal material of friction pair. Based on the characteristics in service, performance requirements and failure modes of current carrying friction pair materials, the classification, characteristics and research status and progress of copper matrix composites under current carrying friction condition were reviewed, and the development trend of copper matrix composites was prospected.关键词：Current Carrying Friction;Copper Matrix Composites;Friction and Wear;Wear Mechanism
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发布时间：2024-04-01 - 摘要：A quick calculation equation of permanent mold cooling water volume was proposed through thermodynamic calculation and a casting simulation software for multiple cycle simulation analysis on temperature of the casting mold. The water-cooling design method can provide a theoretical reference for fast reaching heat balanced temperature field of casting process by permanent mold.关键词：Permanent Mold;Heat Balance Calculation;Mold Cooling;Numerical Simulation
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发布时间：2024-04-01 - 摘要：The ProCAST software was used to simulate the die-casting process of Mg-xSm-0.3 Zn series magnesium alloy. The initial parameters, such as pressure, specific pressure, mold temperature casting temperature and injection rate were set as 0.2 MPa, 40 MPa, 200～280 ℃, 680～740 ℃ and 1.5～6.0 m/s, respectively, to understand the effects of these parameters on the die-casting process of rare earth magnesium alloy. The results indicate that the distribution of shrinkage porosity can be improved when the mold temperature and casting temperature are appropriately low, and the difference of mold temperature has a more obvious effect on the filling process of alloy. Proper increase in injection speed can make the casting better feeding, however should not be too high in order to reduce the service life of the metal mold. When the content of rare earth is 0.8%, the filling process is the most stable, and the time needed for filling and complete solidification reaches the peak. With the increase of rare earth content, the temperature difference between solid and liquid is decreased from 70 ℃ to 46 ℃, and the shrinkage cavity and porosity of the castings are effectively improved.关键词：Magnesium Alloy;Die Casting;Rare Earth;Numerical Simulation
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发布时间：2024-04-01 - 摘要：Laser solid forming of TB18 titanium alloy was carried out by BLT-C1000 SLM additive manufacturing equipment. The effects of laser power, scanning speed and powder feeding amounts on the microstructure and morphology characteristics of single channel deposition layer and block were investigated by three-factor and three-level orthogonal test method, and the forming parameters were optimized. The results indicate that the single channel deposition layer is characterized by columnar grain, and the width to height ratio is increased with the increase of scanning speed and laser power and the decrease of powder feeding amount, of which the influence degree is in the sequence of scanning speed>laser power>powder feeding amounts. The microstructure of the block is characterized by two-state. With the increase of scanning speed, the microstructure of the alloy is transformed from the two-state microstructure with distinct α+β phase to that with uniform distribution of secondary α phase in the β matrix. In order to obtain desirable microstructure, the optimal parameters of forming process is scanning speed of 800～1 000 mm/min, laser power of 3.0～3.5 kW and powder feeding rate of 25～30 g/min.关键词：Laser Solid Forming;TB18 Titanium Alloy;Microstructure;Process Parameters
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发布时间：2024-04-01 - 摘要：The FeCrMnCoNi high-entropy alloy powders were fabricated by gas atomization method, and the influences of atomization pressure and test tube diameter on powder particle dimension were investigated. The results indicate that with the increase of the atomization pressure, the proportion of powders with particle dimension below 100 μm is increased from 57% to 72%, and the mean particle dimension is decreased from 82.6 μm to 44.2 μm. As the pore diameter of the test tube decreases, the proportion of powders with a diameter less than 100 μm is decreased from 79% to 49%, and the mean particle dimension is increased from 40.3 μm to 103.9 μm. The calculation for the cooling rate of droplets reveal that the cooling rate of droplets with a diameter of 10～200 μm is between 3.8×10~4 K/s and 4.3×10~6 K/s, and the rapidly cooled droplets are prone to adhere to the surface of incompletely cooled large droplet. Therefore, the larger the particle dimension of the powder is, the more satellite spheres adhered on the surface is. The larger the droplets obtained by atomization is, the smaller the degree of subcooling is, the greater the powder crystal grains is, and the clearer the dendritic structure is. The decrease in cooling rate also leads to the transformation of internal structure of powder from cellular crystals to mixture of cellular and columnar crystals and then to form dendrites.关键词：High-entropy Alloy;Powder;Cooling Rate
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发布时间：2024-04-01 - 摘要：The SHP34-500 A multifunctional liquid forming equipment was utilized to trial-produce ZAlSi7 Mg aluminum alloy diaphragm for mine shells, and the structure evolution and mechanical properties of the castings at different specific pressures, pouring temperatures and pressure holding times were investigated. The results indicate that with the increase of the specific pressure and holding time, and the decrease of the pouring temperature, the grain size of the casting presents a decreasing trend. After optimization, the optimal squeeze casting process parameters are specific pressure of 130 MPa, pouring temperature of 720 ℃, and holding time of 20 s, where the tensile strength, yield strength and elongation reach 209.9 MPa, 121.8 MPa, and 10.3%, respectively, after casting body sampling. After heat treatment, the tensile strength, yield strength and elongation are 259 MPa, 179.6 MPa, and 11.8%, respectively.关键词：Squeeze Casting;Process Parameters;ZAlSi7Mg alloy;Mechanical Properties
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发布时间：2024-04-01 - 摘要：Taking recycled aluminum A356 alloy ingots as object, main processes such as compositional adjustment, micro-alloying as well as refining and deslagging were optimized, and the casting performance, microstructure and mechanical properties of treated alloy were evaluated. The results indicate that impurity content in recycled A356 aluminum alloy is relatively low and the morphology of the iron-containing phase presents mainly rod-like structure after the optimization treatment. The casting, tensile and rotary-bending fatigue properties of A356 alloy produced by recycled Al show little difference from those produced by electrolytic aluminum. The results reveal that the recycled Al is able to replace the electrolytic Al in producing A356 alloy, thus reducing energy consumption.关键词：Recycled Al;Refining and Deslagging;Microstructure;Rotary-bending Fatigue
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发布时间：2024-04-01 - 摘要：The effects of rotation rate on microstructure and mechanical properties of 7055-0.25 Sc Al alloy during friction stir processing（FSP） were investigated. The results indicate that the low rotation rate（300 r/min） can effectively inhibit the coarsening of grains and η phase, while high rotation rate（1 500 r/min） leads to the dissolution of η′ phase. The elongation of 7055-0.25 Sc alloy is enhanced by FSP, which, however, also reduces the strength. For the FSP specimens, the FSP-300 exhibits the highest elongation and the FSP-1500 exhibits the highest strength.关键词：Al Alloy;Friction Stir Processing;Microstructure;Mechanical Properties
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发布时间：2024-04-01 - 摘要：The Gleeble-3800 thermal simulation testing machine was utilized to conduct isothermal constant strain rate compression experiments on SP700 titanium alloy, and the thermal deformation behavior of the alloy at deformation temperature of 700～950 ℃, strain rate of 0.001～1 s-1 and maximum strain of 0.9 was investigated. The influence law of different deformation process parameters during thermal deformation on microstructure evolution and microhardness of the alloy was analyzed. The results indicate that the deformation temperature and strain rate have a great influence on the peak flow stress, microstructure evolution and microhardness of the alloy. When the strain rate is constant, with the gradual increase of the deformation temperature, the peak flow stress of the alloy is decreased, and α phase is gradually spheroidized, which finally undergoes dynamic recrystallization, while the microhardness is increased firstly and then decreased, and finally increased again. When the deformation temperature is constant, with the gradual increase of the strain rate, the peak flow stress is increased, and the spheroidization rate of α phase is decreased, which finally presents a local flow phenomenon, and the microhardness is firstly increased and then decreased.关键词：SP700 Titanium Alloy;Deformation Process Parameters;Microstructure;Microhardness
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发布时间：2024-04-01 - 摘要：Ultra-thin width precision titanium foil strip has broad application prospects in hydrogen energy, fuel cell, chemical industry, 3 C and other fields. However, the preparation is difficult due to high dimensional accuracy, thin thickness and bandwidth. The surface quality, microstructure, properties and shape of ultra-thin width precision titanium foil strip were investigated, and the ultra-thin width precision titanium foil strip with nominal specification of 0.1 mm×420 mm was obtained. The chemical composition, microstructure, mechanical properties and forming properties were analyzed, and the marketing application direction of precision titanium foil strip was pointed out.关键词：Precision;Titanium Foil Strip;Preparation;Performance
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发布时间：2024-04-01 - 摘要：The mechanical properties of the vacuum assisted high pressure die casting magnesium alloy shock towers were analyzed by tensile testing, and its microstructure were analyzed by SEM, OM and EDS. The vacuum assisted high pressure die casting filling process was simulated using EKKCapcast software, and the porosity of different positions of the shock towers were compared, and then the origination of air entrapment in the casting was analyzed. The results reveal that the mechanical properties of shock towers are little affected when the switchover position is varied between 560 mm and 600 mm. The analysis of the tensile fracture reveals that the gas pore is responsible for the low mechanical properties of the shock towers at the local location. The possible location and severity of air entrapment were predicted effectively by means of simulation.关键词：Vacuum Assisted Die Casting;Shock Tower;Gas Pore;Simulation
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发布时间：2024-04-01 - 摘要：Anatase titanium oxide coatings with micro-nano structure were prepared on the surface of magnesium alloy vascular stent by solvothermal method. The effects of the solvothermal reaction conditions on the microstructure of the coatings were investiagted. The results show that the titanium oxide coatings with different micro-nano structures can be obtained by changing the reaction time, reaction temperature, HF content and F- concentration in the reaction solution. With the reaction time increasing, the coating becomes more denser and the anatase morphology is developed from octahedron to platelike structure. With the increase of reaction temperature, the platelike microstructure is increased with the decrease of the thickness. With the increase of HF content in the solution, the distribution of titanium oxide is gradually sparse and the coating efficiency is decreased. With the F- increasing, the arrangement of platelike titanium oxide is tended to be dispersed from multiple overlapping to single. Under the conditions of 160 ℃, 10 h, 0.25 mL/HF（40%）, 0.25 mL/NH4F（0.2 mol/L）, the uniform and compact titanium oxide coating with regular lamellar arrangement are obtained on the surface of magnesium alloy vascular stent, and the surface roughness is 350.7 nm.关键词：Mg Alloy;Coronary Stents;TiO2 Coating;Micromorphology;Solvothermal Synthesis
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发布时间：2024-04-01 - 摘要：Through hardness test, tensile test, fracture scanning electron microscopy（SEM） and welding zone transmission electron microscopy（TEM） observation, the effects of natural aging on the microstructure and properties of 6005 A-T4 friction stir welded joints were investigated. The results indicate that the maximum tensile strength of the friction stir welded specimens after natural aging is 194 MPa, and the elongation is 10.9%, while the minimum tensile strength is 180 MPa, and the elongation is 10.3%. The average tensile strength is 186 MPa, and the elongation is 10.2%, which are 89.0% and 93.5% of the base metal, and increased by 5.2% and 9.7%, respectively, compared with the unaged specimens. After natural aging, the hardness of the weld joints presents a “W”-shaped distribution, of which the heat-affected zone, thermo-mechanical influence zone, and weld nugget zone are all increased, and the weakest area is changed from the thermo-mechanical influence zone after welding to the heat-affected zone after natural aging. The fracture after aging is basically consistent with that of the base material with larger and deeper dimple, which coincides with the elongation result, and closer to the base material. After natural aging, β phases are observed in each area of the weld by TEM, and the heat-affected zone is less affected by the welding heat, resulting in insufficient precipitation power, which is the weakest area after natural aging.关键词：6005A Aluminum Alloy;T4 Treatment;FSW;Natural Aging
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发布时间：2024-04-01 -
Effects of Rare Earth Y on Oxidation Resistance of Cr20Ni80 Electrothermal Alloy at High Temperature
摘要：Four kinds of Cr20 Ni80 alloys with different rare earth Y contents were prepared by non-consumable vacuum arc melting furnace, and the effect of rare earth on high temperature oxidation resistance of alloy was explored. The oxidation behavior of alloys at 1 000 ℃ were investigated by XRD, SEM and EPMA. The results indicate that Y addition can significantly improve the high-temperature oxidation resistance of the alloy, and the density of the oxide film and the adhesion of the matrix alloy are enhanced. The main component of the oxide film is Cr2O3 with a certain amount of NiCr2O4, among which the alloy with 0.3%Y has the desirable high-temperature oxidation resistance.关键词：Rare Earth Elements;Oxide Film;High Temperature Oxidation;Electrothermal Alloy- 3
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发布时间：2024-04-01 - 摘要：The effects of single or compound addition of La and Ce on thermal conductivity, microstructure and mechanical properties of Al-3 Si-0.5 Cu-0.7 Fe casting alloys were investigated by optical microscope, SEM and tensile testing. The results indicate that the microstructure of alloys is gradually refined, and the thermal conductivity and mechanical properties of the alloy are improved with the increase of rare earth content. After compound addition of 0.3%（La+Ce）, the coarse dendritic of primary α-Al phases become fine, and the morphology of eutectic silicon is transformed from bulk-like shape and strip-like shape into particle-like shape, where secondary dendrite arm spacing（SDAS） of α-Al phases reach the minimum（27.32 μm）. The thermal conductivity, tensile strength and elongation of the alloy reach up to 170.67 W/（m·K）, 245.4 MPa and 19.8%, respectively, increased by 7.72%, 31.74% and 74.24%, compared with those of ones without rare earth addition.关键词：Al-3Si-0.5Cu-0.7Fe Alloy;La+Ce;Thermal Conductivity;Microstructure;Mechanical Properties
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发布时间：2024-04-01 - 摘要：Cu-15 Ni-3 Al alloys with different dimensions, and different L12 phase morphologies and distributions were prepared by solid solution-aging treatment, and the formation of continuous and discontinuous precipitation phase regions in the alloy was explained by thermodynamic analysis and CALPHAD method. The results indicate that in the region close to the grain boundary, partial L12 phase is attached to the grain boundary and nucleated during the solid solution stage, thus beginning to grow in the early aging stage, eventually leading to the formation of discontinuous precipitation region. At lower temperatures, the L12 phase has a greater driving force for nucleation due to the higher supersaturation and excessive Gibbs free energy of the system, which is precipitated from the matrix through continuous precipitate decomposition, resulting in the formation of a continuous precipitation phase region.关键词：Solid Solution and Aging Treatment;CALPHAD;Supersaturation;Precipitate Decomposition
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发布时间：2024-04-01 - 摘要：Based on the metal Ga with low melting point and good thermal stability, Mg-43 Ga and Mg-19 Al-24 Ga heat storage alloys were designed and prepared. The density of the alloys was measured by drainage method. The phase composition, microstructure, phase transition temperature and latent heat of the alloys were investigated by means of X-ray diffraction, metallographic microscope, electron probe microanalyzer and differential scanning calorimetry, and the compatibility of Mg-19 Al-24 Ga alloy with carbon steel（Q235） and stainless steel（316） container materials was analyzed. The results show that the phase transition temperature, latent heat and heat storage density of Mg-43 Ga and Mg-19 Al-24 Ga alloys reach 422.70 ℃, 171.90 J/g, 434.36 J/cm~3, and 373.67 ℃, 172.70 J/g, 397.86 J/cm~3, respectively. Both of them have potential to be good phase change heat storage materials. The compatibility of 316 stainless steel with Mg-19 Al-24 Ga alloy is obviously better than that of Q235 carbon steel.关键词：Mg-43Ga Alloy;Mg-19Al-24Ga Alloy;Phase Transition Materials;Thermal Energy Storage;Compatibility
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发布时间：2024-04-01 - 摘要：Cu-3.2 Ni-0.75 Si alloy was prepared by twin-roll strip casting（TRSC）. The effects of solution temperature on microstructure, electrical conductivity, microhardness and element segregation behavior of the alloy were investigated. The results indicate that the microstructure of the alloy is gradually recovered, recrystallized, and recrystallized grains grow up with the increase of solution temperature. As the solution temperature increases, the microhardness is decreased and electrical conductivity is firstly decreased and then increased. After solution at 900 ℃ for 1 h, Ni and Si are completely dissolved into Cu matrix, forming a single α-Cu solid solution, where the microhardness and electrical conductivity of the alloy are 67.2 HV and 9.338 MS/m, respectively.关键词：Cu-3.2Ni-0.75Si Alloy;Twin-roll Strip Casting;Solution Treatment;Supersaturated Solid Solution
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发布时间：2024-04-01 - 摘要：In order to simulate the situation that 3 D-Cf/Al composites are damaged to form notches and crack as structural assemblies, taking laminated braided Cf/Al composites as the research object, the effects of V-shaped and rectangular notches on the mechanical properties of the composites were analyzed. The results indicate that the tensile strength of the laminated braided Cf/Al composite is 553.5 MPa and the elastic modulus is 91.5 GPa with the rectangular notch, which are 17.4% and 2.9% lower than those of the unnotched ones. After setting the V-shaped notch with the root fillet of R=0.3 mm, the tensile strength is 545.0 MPa, which is 18.6% lower than that of the unnotched ones, and the elastic modulus is 110.2 GPa, which is 17.0% higher than that of the unnotched ones. After setting the V-notch with root fillet R=0.6 mm, the tensile strength is 663.0 MPa, which is 1.0% lower than that of the unnotched ones, and the elastic modulus is 106.5 GPa, which is 13.1% higher than that of the unnotched ones. As the root fillet of the V-notch is increased from R=0.3 mm to R=0.6 mm, the notch strength ratio is increased from 0.81 to 0.99, where the tensile strength of the laminated braided Cf/Al composite is increased and the elastic modulus has little change. Combined with the fracture morphology, the composites are characterized by brittle fracture, and mechanism of warp fracture is dominated by the fiber axial failure caused by the combination of matrix cracking, fiber pullout and interfacial debonding.关键词：Laminated Braided;Cf/Al Composites;Notch Tension;Failure Analysis
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发布时间：2024-04-01 - 摘要：The microstructure and mechanical properties of the high-strength-ductility Al-Si-Cu-Mg alloy by squeeze casting were investigated. The results indicate that the alloy has excellent compactness, where the eutectic Si and Cu-containing phases are uniformly distributed in the cross-section of the specimen. After T6 treatment, the eutectic Si and Cu-containing phases are significantly spheroidized. The Cu/Si/Mg-containing nano-reinforced precipitations during aging can effectively increase the yield strength by more than 180 MPa, meanwhile the alloy can maintain desirable ductility. The yield strength, tensile strength of the squeeze casting Al-9 Si-3.4 Cu-0.15 Mg alloy can reach over 375 MPa and 423 MPa, elongation over 9% after T6 treatment.关键词：Casting Aluminum Alloy;Nanophase Strengthening;Mechanical Properties
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发布时间：2024-04-01 - 摘要：Based on the theory of local extrusion technology, the casting process of lower cylinder block was analyzed, and the general process of using local extrusion technology to solve the problems of gas hole and crystal shrinkage was expounded. Firstly, the local extrusion position was determined to be the hot spot, and then the extrusion cylinder was determined by the appropriate extrusion pressure. Secondly, the volume of local extrusion was estimated, and the distance and diameter of extrusion rod was calculated. Finally, the delay time and duration of local extrusion was presented by the liquid-solid coexistence time. The results show that the reasonable use of local extrusion technology can effectively reduce the shrinkage volume.关键词：Local Extrusion;Aluminum Alloy Die Casting;Die;Shrinkage Cavity
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发布时间：2024-04-01 - 摘要：ProCAST software with pressure chamber flow analysis was used to visually adjust the die casting parameters, which was closer to the actual production environment. Experiments with different parameters in the software was carried out. The results show that the optimized processing parameters are presented as follows: low-pressure speed of 0.2 m/s, the high-speed switching point of 630 mm, and the high-pressure speed of 5 m/s. The parameters was verified by a 32 000 kN Buhler die-casting machine, and results reveal that the die-cast gear box presents the satisfeid appearance, and absence of defects such as cold shut and pores can be observed. X-ray detection shows that absence of shrinkage holes and other defects can be observed inside the castings.关键词：Aluminum Alloy;Simulation Analysis;Die Casting Process;Parameter Optimization
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发布时间：2024-04-01 - 摘要：The deformation and shrinkage data of large-scale double solid equiaxed crystal vanes were analyzed by 3 D optical scanning technology, and influence of different wax placement ways on the dimension were investigated to obtain the appropriate control method of vane shrinkage and dimension. The results reveal that the shrinkage factor along spindle direction（Z） is increased from the leading edge to the exhaust edge, while that along basin-back direction（Y） is decreased from the leading edge to the exhaust edge. The shrinkage factors of large flange are much smaller than small flange along both inlet-outlet（X） and basin-back direction. Blade deformation is mainly induced by wax making and pouring process. In view of wax pattern deformation, placing wax laterally with the backside of vane downward is the most conducive to reducing deformation.关键词：Gas Turbine Vane;Investment Casting;Shrinkage Factor;Dimension Control
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发布时间：2024-04-01 - 摘要：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、宁波市铸造行业协会
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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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