最新刊期
卷 41 ， 期 12 ， 2021
- 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。
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发布时间：2023-12-18 - 摘要：The self-designed semi-solid slurry equipment with uniform internal cooling stirring was adopted to prepare semi-solid slurry of AZ91 D magnesium alloy. The evolution law of semi-solid microstructure with various contents of Al-Ti intermediate alloy and heat preservation time were investigated. The results indicate that the solid particles of semi-solid slurry become fine, spherical, uniform, presenting good rheological properties with appropriate amounts of Al-Ti intermediate alloy and heat preservation time. When the addition of Al-Ti intermediate alloy is 0.1% and heat preservation time is 30 min, the average grain size and average shape factor of semi-solid slurry are 45.17 μm and 0.69, respectively, and the semi-solid slurry structure of AZ91 D magnesium alloy is fine and spherical, evenly distributed in the solution. However, the refining effect is weakened when the addition of Al-Ti intermediate alloy exceeds 0.1% and the heat preservation time exceeds 30 min. Moreover, the mechanism of semi-solid structure prepared by Al-Ti intermediate alloy and uniform internal cooling stirring was investigated.关键词：Al-Ti Intermediate Alloy;Uniform Internal Cooling Stirring;Grain Refinement;Semi-solid Slurry
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发布时间：2023-12-18 - 摘要：<正>近日,中铝中央研究院材料分院与中国商飞就航空铝合金材料研究进展及发展趋势召开交流座谈会,就进一步加强民机铝材项目合作进行了深入研讨。会议听取了中铝中央研究院材料分院关于航空材料重点研发方向、民机铝材研制需求及发展方向的介绍,分析了目前国内航空铝材存在的问题与面临的挑战。座谈会上,双方围绕材料跟踪仿制,向自行设计、面向未来的材料体系跨越式发展等方面内容进行了深入探讨。
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发布时间：2023-12-18 - 摘要：<正>俄所电化学系统和表面改性工艺部门科研人员开发出一种保护镁合金的聚合物复合涂层。使用该方法可在镁合金表面形成几乎没有瑕疵的表面结构。镁合金广泛用罗斯科学院远东分院化学研究于包括汽车和飞机零件制造等领域。镁合金不仅很轻,而且非常坚固,但同时也有易受腐蚀和磨损等明显缺陷。因此,使用该材料制成的设备使用寿命比较短,且维修或替换都比较昂贵。为给这种材料提供保护,
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发布时间：2023-12-18 - 摘要：<正>据立科技大学与克拉斯诺雅尔斯克（Klasnoyarsk）磁体动力学科学生产中心共同研发出了一种新工艺,可制备独特的、以前未见的高强度特耐热导电铝合金,取代在航空国外媒体近期报道,俄罗斯国航天器和高铁上应用的更昂贵、更重的铜导线。这种新的工艺是先采用电磁模铸法铸造直径为10mm的线坯,再在400℃进行处理,以获得稳定的组织。该铝合金比现有所有铝合金的热稳定性高,可在250～300℃下保持其优秀性能。
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发布时间：2023-12-18 - 摘要：<正>俄罗斯研究者开发出一种能够使高级手术关键材料之一的钛合金产生抗菌作用的新技术。研究人员称,根据新方法加工的植入物将显著加快和促进创伤的恢复。骨骼受损后的力学性能和恢复能力会随着年龄的增长而显著下降,且这种损伤需要长期治疗。使用由未改性金属和合金制成的植入物可能导致并发症,之后或将需要进行二次外科手术。能够抑制细菌活性的材料有助于体内植入物手术更安全、更可靠,为此,研究出了Ti-Zr-Nb钛合金喷镀抗菌涂层的方法。
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发布时间：2023-12-18 - 摘要：<正>SMM调研显示,2021年10月原样本压铸锌合金企业开工率为34.22%,环比下降2.69%,同比下降6.46%。新样本（注:新样本调研企业数量为67家,涉及产能163.14万t）中10月开工率为51.22%,环比下降5.03%。
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发布时间：2023-12-18 - 摘要：<正>机械铸造领域及机械铸造企业是我国工业社会中的一类重要组成部分,其在一定程度上代表了我国的先进生产能力与先进生产技术,也标志着我国其他相关工业行业的发展速度与发展水平。在这种背景下,如何进一步提高铸造领域的发展势头,使其能够实现长期、可持续、健康发展一直是机械铸造领域从业者与相关监管、研究部门所共同关注的核心问题。通过提高机械铸造领域的技术与工艺,相关企业与工厂能够更高效地产出质量更高、性能更好的机械铸造产品,进而更好地服务于机械铸造产品应用企业,真正的为经济发展做出贡献。
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发布时间：2023-12-18 - 摘要：<正>随着网络技术的发展,5G移动网络和移动终端设备的不断升级,教育信息化进程也得以快速发展。如今教育信息化已经从上传网课到在网上观看的教育信息化1.0时代升级到了教育信息化2.0时代,在线教育正凭借应用信息科技和互联网基础设施的建设与普及,得以快速发展。在线教育也创下了20多年来的新高度。老师通过在线的开放式课程可以与多名同学在线上进行互动式网络教学。至此,网络信息化线上教育从原来的老师录完视频上传到网上,
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发布时间：2023-12-18 - 摘要：<正>随着当下经济社会的快速发展与科技水平的不断提高,我国的重工业发在近十年来获得了突飞猛进的进步。同时,随着世界工业化进程的逐步加快,工业发展进入了全新的时代,其常被称为第四次工业革命时代,其即将彻底改变整个工业发展或工业进步的运作方式和发展方式。具体而言,第四次工业革命及其应用是当今世界各国在科技创新领域保持竞争力的重要课题之一,不能适应工业4.0时代进程的国家将无法在科技上快速发展,也无法跟上当前的创新进程。第四次工业革命主要具有四个特点,包括生产系统的垂直网络化、全球价值链网络的横向整合、整体价值链的端到端工程,
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发布时间：2023-12-18 - 摘要：<正>在新媒体的迅猛发展背景下,高职铸造专业思政教育改革遇到了新的契机和挑战。新媒体改变了老师传统的讲授方法和学生的学习方法,在对新兴信息技术和新媒体的广泛使用中,也推动了在课程理念、课堂机制等领域的重大改革。而基于思政课的特殊性质,将新型媒介和思政教育课程有机地结合,推动思政工作课程教学变革以应对新状况、应对新问题、拓展新方式也变得十分必要。习近平总书记还指出,思想政治工作必须围绕学生、服务学生。
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发布时间：2023-12-18 - 摘要：<正>随着全球经济、科技一体化进程的加速,世界上各个地区与国家之间的联系日益密切,其一方面有效带动了全球工业社会与商业社会的进步,另一方面也使部门相对落后地区得到了充分开拓。在当下全球化的大环境内,我国作为世界第二大经济体,扮演了极其重要的引领角色,如我国基础建设行业、制造业、工业等领域均位于世界领军水平,而铸造专业与铸造相关企业便是其中一类贡献显著的重要组成部分。对于铸造领域而言,为充分融入于全球化市场,拥有良好的沟通与交流能力必不可少,
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发布时间：2023-12-18 - 摘要：<正>步入二十一世纪,随着全球工业化、信息化、智能化的进一步发展,劳动力市场对工作者的需求逐步提升,其不但要求工作者具有较高的知识水平、较强的业务能力、较广的技术经验,也同时要求工作者具有较高的思想水平和认知水平。针对劳动力市场对工作者的高技术要求,高职教育以具有针对性的职业培养为教育主体,进一步培养职业化技术人才,为我国用人市场提供了源源不断的高技术人才。具体而言,职业教育区别于高等教育,
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发布时间：2023-12-18 - 摘要：<正>经济水平的快速提高和科技水平的不断推进离不开工业领域中各行业的共同努力和提高,而铸造行业作为工业社会中担负了重要制造与生产任务的一项重点领域,其在我国近几十年的发展中做出了巨大贡献。一方面,铸造企业是工业社会中上游行业的整合力量,其担负着统筹工业社会发展、规划原材料供应及原始产品的生产方向的重要任务,另一方面,铸造企业为工业社会中的下游行业提供了集中生产力和基础技术支持,其有效支撑了新兴企业的发展需求,为这些企业提供用于制造和生产的铸造零部件及生产加工设备。
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发布时间：2023-12-18 - 摘要：<正>当前,互联网已经深入了各行各业,并且对许多传统行业造成了巨大的影响,甚至成为了一些行业的主要经营模式。我国自2010年以来,一直大力推行"互联网+"模式,引导传统制造业变革,适应新时代的发展,铸造冶金企业也在这个过程中不断完善发展自身的互联网经营方式。将对我国铸造冶金企业当前的互联网经营状况作出分析,并提出一定的改进战略意见。受到信息技术高速发展带来的影响,互联网已经对所有行业都产生了影响,并且极大程度改变了人们的日常生活方式,成为了人们日常的一部分。
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发布时间：2023-12-18 - 摘要：The application of magnesium alloy as a structural member has been restricted due to its poor mechanical properties such as yield strength and hardness. A lot of results of rare earth（RE） magnesium alloys were presented on the smelting, casting, heat treatment, plastic processing etc. By adjustment of the type, shape and distribution of the second phase in the alloy, the relationship between alloy composition-process parameters-structure and properties was gradually established. The characteristics and precipitation law of the second phases in Mg-Zn-Gd alloys were expounded, and the influence of alloy composition and processing technology on the mechanical properties of the present alloy was reviewed. Finally, the problems that need to be concerned in the Mg-Zn-Gd alloys were put forward.关键词：Mechanical Properties;Second Phase;Alloy Composition;Processing Methods;Mg-Zn-Gd Alloy
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发布时间：2023-12-18 - 摘要：Based on the recent research, effects of Er on melt purification, microstructure and properties have been analyzed. Besides, a simple model has been built up to describe the solubility-changing of RE magnesium alloys containing Er. Furthermore, strengthening mechanisms and corrosion resistance of cast magnesium alloys containing Er were discussed. Finally, prospect of research on cast magnesium alloys containing Er was presented.关键词：Magnesium Alloys;Er;Cast;Microstructure;Properties
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发布时间：2023-12-18 - 摘要：In view of the serious shrinkage problem in a titanium alloy ring casting, multi-round simulation was carried out for the filling and solidification process of the casting by ProCAST software to predict the distribution of shrinkage defects, and process optimization and production verification on simulation analysis were conducted.The results indicate that the distribution of shrinkage defects is basically consistent with the simulated analysis, where the optimized castings have no large shrinkage defects, improving the quality of the casting and saving costs.关键词：ProCAST;Titanium Alloy;Simulation;Shrinkage Cavity
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发布时间：2023-12-18 - 摘要：In order to solve the problem of lack of feature extraction dimension for typical defects in X-ray images of aluminum alloy die castings, and a large number of manual interventions affecting the accuracy of feature extraction, a typical defect feature extraction algorithm for X-ray imaging of aluminum alloy die castings was put forward. Multiple analysis dimensions for typical defects such as pore, misrun and deformation in aluminum alloy die castings was carried out. Filtering denoising, threshold segmentation and other methods were applied to preprocess the die casting image, and multi-dimensional features such as perimeter and area were extracted to realize automatic feature extraction of pores and slag inclusion defects. The experimental results on aluminum alloy die castings actually produced by some enterprises show that this method can effectively extract the typical defect features of aluminum alloy die castings, providing reference for subsequent defect detection and identification.关键词：Aluminum Die Castings;X-ray Image;Defect Feature;Feature Extraction
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发布时间：2023-12-18 - 摘要：The orthogonal design test was used to invesitgate the process of adding zinc or tin foil, and the composite addition of zinc foil and tin foil to carry out the friction stir lap test of interfacial alloying magnesium/aluminum dissimilar alloy. The orthogonal experiment results show that the feed speed has the greatest influence on the mechanical properties of the joint, and the thickness of the zinc foil has a greater influence on the mechanical properties of the joint than that of tin foil. When the thickness of tin foil and zinc foil are both 0.05 mm, the welding speed is 110 mm/min, and the rotation speed is 750 r/min, the welded joint presents the maximum tensile shear strength. Compared with adding zinc foil or tin foil alone, the content of brittle magnesium-aluminum intermetallic compound in the joint added by composite is decreased. The joint is mainly composed of magnesium-zinc-aluminum ternary phase and magnesium-zinc intermetallic compound. The mechanical properties of the joint are about 35% higher than those of ones with zinc or tin alone.关键词：Magnesium Alloy/Aluminum Alloy;Zn Foil/Sn Foil;Friction Stir Lap Welding;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The origination of cracking of a ZL101 aluminum alloy gearbox during service process was investigated by using metallographic microscope, scanning electron microscope, energy spectrum analysis and other instruments. The results indicate that the crack of the ZL101 aluminum alloy gearbox is characterized by fatigue cracking, and there are stress corrosion cracks at the fatigue source. The main cause of stress corrosion cracking is the presence of corrosive media elements in the working environment of gearbox. Meanwhile, the modification quality of the gearbox is poor, increasing the stress corrosion sensitivity of the base material. In order to avoid the stress corrosion crack of the gearbox, some reasonable preventive measures were provided, such as controlling the content of corrosive medium in the working environment of gearbox and improving the modification quality of gearbox.关键词：Gearbox;Crack;Stress Corrosion
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发布时间：2023-12-18 - 摘要：The thermal deformation behavior and microstructure evolution of the low-density Nb-Ti-Al-Mo-W-Zr alloy were investigated in detail by the isothermal hot compression test with the deformation temperature of 900～1 100 ℃ and strain rate of 0.01～10 s-1 on Gleeble-3800 thermal simulation machine. The results indicate that the flow curves of the alloy are characterized by dynamic recrystallization at low strain rate and high deformation temperature, and dynamic recovery at high strain rate and low deformation temperature, respectively. The flow stress is decreased with the increase of deformation temperature or the decrease of strain rate. The deformation behavior at high temperature can be expressed by the hyperbolic sine function constitutive equation, where the average deformation activation energy is 412.37 kJ/mol. In addition, the significant effect of deformation conditions on the microstructure can also be observed. When the temperature is constant, the dynamic recrystallization region becomes larger with the decrease of strain rate, and when the strain rate is constant, the dynamic recovery is gradually transferred into the dynamic recrystallization as the temperature increases.关键词：Niobium Alloy;Thermal Deformation;Constitutive Equation;Microstructure
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发布时间：2023-12-18 - 摘要：The effects of micro-alloying element La on the microstructures and properties of Al-Mg-Si alloy were investigated. The results indicate that the addition of trace rare earth element La can simultaneously improve the strength and conductivity of the alloy. Trace La improve the strength of Al-Mg-Si alloy by reducing the grain size and promoting the precipitation of（Mg, Si） phase, and improve the conductivity by reducing the content of Mg and Si in Al matrix. It presents a referrence for the preparation of Al-Mg-Si alloy with excellent mechanical and electrical properties.关键词：Rare Earth;Aluminum Alloys;Microstructure;Tensile Properties;Electrical Properties
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发布时间：2023-12-18 - 摘要：The electric pulse was applied on Al-7 Si-0.55 Mg alloy during the aging process with the fixed pulse current, pulse frequency and duty ratio, and variable aging time. The results indicate that the aging time of Al-7 Si-0.55 Mg alloy can be effectively shortened by electric pulse, leading to the rapidly aging. Compared with conventional heat treatment, the hardness and electrical conductivity of Al-7 Si-0.55 Mg alloy are significantly improved after electric pulse aging treatment for 4～7 h. The elongation is 3.15% after electric pulse aging treatment for 5 h, which is higher than that of 3% of ones after conventional heat treatment, and the aging time is shortened by 3 h. The optimum process parameters of Al-7 Si-0.55 Mg alloy can be presented as follows: pulse current of 8 A, pulse frequency of 700 Hz, duty ratio of 0.5, aging temperature of 160 ℃ and aging holding time of 5 h.关键词：Electric Pulse;Aging Treatment;Al-7Si-0.55Mg Alloy;Microstructure and Properties
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发布时间：2023-12-18 - 摘要：The silicon brass bushings were prepared by spinning. The microstructure and properties of the bushing before and after spinning were compared, and the microstructure evolution and strengthening mechanism were analyzed. The results indicate that silicon brass bushing with excellent performance was obtained by spinning process. After spinning, the tensile strength, yield strength, elongation and Brinell hardness reach up to 638.3 MPa, 543.7 MPa, 14.7% and 183.3 HB, respectively, which can be comparable to the foreign advanced level. Large amounts of deformation structures such as slip lines, twins, broken crystals, and sub-crystals are generated in the silicon brass bushing. The grains are refined while the number of small angle grain boundaries is increased, and the β phase with high strength is precipitated along the grain boundary in form of dots, which synergistically contribute to the improvement of material strength and hardness.关键词：Spinning Forming;Silicon Brass Bushings;Microstructure and Properties
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发布时间：2023-12-18 - 摘要：Three-dimensional porous zinc with different pore structure was prepared by electrodeposition process with various deposition parameters. The preparation process of three-dimensional porous zinc and its electrochemical performance as anode of zinc ion battery were investigated. The electrochemical test results indicate that when the current density is fixed at 40 mA/cm2, the three-dimensional porous zinc has relatively suitable impedance and corrosion rate in 2 mol/L ZnSO4 electrolyte environment with the electrodeposition time of 10 min. When the amount of zinc deposited per unit area is maintained at 6.67 mA·h·cm-2, different surface morphologies can be obtained by changing the current density.The cyclic test was carried out in a symmetrical cellpackage at 0.5 mA/cm2, and the results reveal that the three-dimensional porous zinc electrode with lamellar surface deposited at 40 mA/cm2 has lower overpotential and better cycling stability compared with pure zinc foil, where the amount and size of dendrites generated in the cycling process are smaller.关键词：Copper Skeleton;Porous Zinc;Zinc Anode;Zinc Ion Battery
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发布时间：2023-12-18 - 摘要：The Cu-0.33 Be alloy was treated by solid solution at 960 ℃ for 60 min and different aging processes.The changing law of hardness, tensile strength and tensile fracture morphology of Cu-0.33 Be alloy under forging condition and during aging process were investigated.The results indicate that aging treatment can significantly enhance the tensile strength and hardness of Cu-0.33 Be alloy, which reach up to 661.6 MPa and 207（HB）, respectively, after aging at 460 ℃ for 60 min.The grain is fine with aging for 60 min, which grows as the aging time increases. The fracture morphology is characterized by ductile fracture in forging state, which is gradually converted to brittle fracture with the extension of aging time. After peak aging, the fracture is typical brittle intergranular fracture.关键词：Cu-0.33Be alloy;Aging;Hardness;Tensile Strength;Fracture Morphology
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发布时间：2023-12-18 - 摘要：7075 aluminum alloy was prepared by spray deposition and continuous extrusion to eliminate the defects such as element segregation, coarse structure and uneven distribution of second phase and shrintage porosities and holes, and the microstructure and element distribution were compared with those of the as-cast alloy. The results indicate that the spray deposited and continuous extruded 7075 aluminum alloy has low content of impurity elements, fine microstructure and uniform distribution of alloying elements. The OM microstructure reveals that the average grain size of the deposited blank is significantly reduced compared with that of the casting alloy, presenting equiaxed crystal. After continuous extrusion, the matrix density is increased, and the second phase is refined and distributed uniformly along the extrusion direction. The TEM microstructure observes that the billets undergo dynamic recrystallization during continuous extrusion, and the average recrystallized grain size is 3～5 μm. The yield strength and elongation of alloy after retrogression and re-aging treatment reach 493 MPa and 12.6%, which exceed 9.6% and 26% of the aviation standard AMS 4050 H limit, respectively. The EDS results demonstrate that the segregation of the main alloy elements prepared is well inhibited, and the impurity elements of oxygen and carbon are more evenly distributed, which is conducive to improving comprehensive properties of the alloy.关键词：High Alloying;Spray Deposition and Continuous Extrusion;7075 Aluminum Alloy;Microstructure
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发布时间：2023-12-18 - 摘要：The effects of annealing temperature on microstructure, texture, mechanical properties and electrical conductivity of the 0.2 Al2O3/Cu dispersion strengthened copper alloy bars were investigated by means of scanning electron microscope, X-ray diffraction and mechanics tester. The results indicate that no obvious change is observed in the fiber structure of the annealed alloy specimens. With the increase of annealing temperature, the proportion of cube {001} <100> and brass {011} <211> texture is increased, and the goss {011} <100> texture is gradually decreased. The small-angle grain boundaries in the alloy are increased to varying degrees, while thelarge-angle grain boundaries are decreased slightly, which are mainly distributed in the range of 50°～60° misorientation. The micro hardness, tensile strength and yield strength of the alloy are decreased from 150 HV, 551 MPa and 539 MPa to 121 HV, 378 MPa and 323 MPa, respectively, while the elongation is increased from 9.6% to 15.9%, and the conductivity is increased from 52.316 MS/m to 54.520 MS/m, which is increased by 0.464～2.204 MS/m.关键词：0.2Al2O3/Cu Dispersion Strengthened Cropper Alloy;AnnealingTemperature;Texture;Performance
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发布时间：2023-12-18 - 摘要：The uniaxial compression deformation behavior of semi-solid CuSn10 P1 alloy at medium temperature was investigated. The influence of temperature rise effect on the stress-strain curve of the alloy at 350 ℃ and 410 ℃ and strain rates of 0.1～10 s -1 was analyzed. The true stress-strain curve was established after the temperature correction of the experimental data. The results reveal that the temperature rise effect has a significant effect on the flow stress in condition of high strain rate deformation. The strain distribution simulation and microstructure evolution observation were carried out on the deformation behavior of the alloy at 350 ℃ and strain rate of 10 s-1. During the compression deformation, the central region of the specimen is the most deformable and a large number of deformation twins are generated in the grain, of which the number is increased significantly with the increase of strain.关键词：Semi-solid;Medium Temperature Compression;Temperature Correction
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发布时间：2023-12-18 - 摘要：As a newly developed technique, friction stir welding（FSW） is widely applied in the areas of solid-phase welding. The fine defects in the weld seam are in characteristics of multi-tropism and clingy. To achieve the high accuracy and high resolution for the inspection needs of aluminum alloy FSW weld inspection, a method of micro-magnetic testing method based on magnetic signal distribution was proposed according to the weak paramagnetism under a natural geomagnetic field for the 7 A09 aluminum alloy. Specifically, a high-precision magnetic vector quantity sensor was used to collect magnetic induction intensity signal which changes slightly on the surface of weld and the magnetic anomaly signals of weld defects are accurately extracted from the complex original magnetic induction intensity signals through multi-scale property of wavelet transform, directly mapping weld defect information to the separated d1 signal curve. The results indicate that the micro-magnetic resolution for minor defects in aluminum alloy FSW welds can reach 0.2 mm, and the detection error of defect location is only 1.67%. Therefore, the micro-magnetic method can guarantee the non-destructive detection for aluminum alloy friction stir welding with complete coverage and high reliability.关键词：Aluminum Alloy;Friction Stir Welding;Micro-magnetic Detection;Multi-scale Wavelet Transform
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发布时间：2023-12-18 - 摘要：A new kind of Al-TCB seed alloy was adopted to refine A356 aluminum alloy, and the anti-poisoning refining behavior of Al-TCB seed alloy on A356 alloy was further investigated. The results indicate that the Al-TCB seed alloy has far better refining effect on the A356 alloy than the Al-5 Ti-1 B refiner. When A356 alloy with addition of 0.3% Al-TCB seed alloy is held from 15 min to 480 min at 730 ℃, the refining effect is stable without failure basically. When the holding time is 60 min, the refining effect is optimal, where the average grain size reaches（135.3±3.5） μm. The above results demonstrate that the Al-TCB seed alloy has excellent anti-poisoning ability and has an efficient, long-lasting and stable refining effect on A356 alloy.关键词：A356 Alloy;Al-TCB Seed Alloy;Grain Refinement;Anti-poisoning
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发布时间：2023-12-18 - 摘要：The effects of Cu and Er on the microstructure and mechanical properties of in situ hypoeutectic Mg2Si/Al composites prepared by conventional metal mold casting were investigated. The results indicate that the grain size of eutectic Mg2Si is significantly refined and the morphology is transformed from coarse strip and Chinese character to fine strip, point and fiber after adding Cu and Er. Meanwhile, the needle-like β-Al5FeSi is converted into fine and irregular Er, Cu-rich particles. After T6 heat treatment, the eutectic Mg2Si phase containing 0.45% Er and 3.5%Cu reaches complete spheroidization, and most of the particulate phase containing Er and Cu disappear. The tensile strength, yield strength and elongation are improved with the simultaneous addition of Er and Cu, reaching up to 351 MPa, 187 MPa and 2.8%, which are increased by 57.4%, 37.5% and 86.7%, respectively, compared with the specimens without Er and Cu addition. After T6 treatment, the tensile strength are greatly increased to 408 MPa.关键词：Mg2Si/Al Composites;Er;Cu;Eutectic Mg2Si
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发布时间：2023-12-18 - 摘要：The effects of the content of coarse aluminum grains on the mechanical properties of nano-Al2O3 p/7075 aluminum-based composites were investigated. Fine powder（～5 μm） of 7075 alloy and nanometer Al2O3 particles were high-energy ball milled through powder metallurgy method, and mixed with 7075 coarse aluminum particles of 0～15% for ordinary ball milling. After compacting and vacuum sintering and finally extrusion, the composites were fabricated. The compressive properties and hardness of the composites were tested at room temperature. The results indicate that as the content of coarse grains increases, the compressive strength of the composites is slightly decreased, while the elongation is increased obviously, where the compressive strength and hardness of composite containing 15% coarse grain are 5.0% and 7.2% lower than those of one without coarse grains, respectively, while the elongation is 27.6% higher. Therefore, the plasticity of composites is improved obviously by adding hierarchical structured composites that are manufactured by adding coarse matrix particles into nano ceramic particles reinforced aluminum matrix composites.关键词：Aluminum Matrix Composites;Hierarchical Structured Composites;Nano-composites;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The influence of laser power and scanning rate on the microstructure and mechanical properties of NiTi alloy was investigated. Energy density was introduced to determine the optimum process forming interval of SLM NiTi alloy. The results indicate that with the increase of laser power and scanning rate, the microstructure of the specimens presents homogeneous. However, the laser power has great influence on the phase yield strength, while scanning rate has great effect on the dislocation yield strength. Finally, the optimal process parameters are determined as follows: laser power of 85 W, scanning rate of 750 mm/s, layer thickness of 25 μm and hatch spacing of 60 μm, where the specimens exhibit typical square grain structure and excellent compression performance in quasi-static test.关键词：Selection Laser Melting;NiTi Alloy;Energy Density;Mechanical Property;Microstructure
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发布时间：2023-12-18 - 摘要：Selective laser melting（SLM） was adopted to form 17-4 PH high strength steel. The effects of laser power and scanning intervals on the microstructure and properties of the specimens were investigated to determine optimum technological parameters. The microstructure, tensile properties and fracture mechanism of the optimized specimens were analyzed. The results indicate that the low energy density of the laser leads to the unfused region due to the low energy absorption energy when the laser power is 165 W. When the laser power is increased to 205 W, the absorbed energy of the powder is increased, resulting in the spheroidization and increased porosity. The scanning interval has a poorer effect on pore defects than scanning power. When the laser power is 185 W and scanning spacing is 110 μm, the porosity distribution is reduced and the hardness value reaches 370 HV. The microstructure of 17-4 PH high strength steel prepared by SLM is mainly composed of martensite and austenite with precipitation hardening phase of ε-Cu, which improves the hardness of the material. The shape of fracture dimples of tensile specimens is similar with small size, providing higher strength and good toughness.关键词：17-4PH Stainless Steel;Selective Laser Melting;Microstructural Features;Mechanical Properties
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发布时间：2023-12-18 -
Improvement of Wear Resistance of Die Casting Mold Baffle Based on Reasonable Heat Treatment Process
摘要：Based on the experimental steel supplied by the die-casting mold baffle, it is subjected to homogenization annealing at 1 100 ℃ for 2 h, water quenching at 880 ℃ for 30 min, and tempering at 200 ℃ and 250 ℃ for 2 h, respectively, and then its microstructure, macroscopic hardness, mechanical properties and abrasion resistance were analyzed. The results show that after quenching and tempering, the flaky pearlite and reticulated ferrite structure in the experimental steel supplied by the mold is transformed into tempered martensite and a small amount of retained austenite, and the tensile strength and hardness are increased significantly. The wear resistance of the tool steel quenched and 200 ℃ tempering presents desirable, followed by 250 ℃ tempering, which is better than that of the mold supply state.关键词：Die Casting Mold Baffle;Heat Treatment;Microstructure;Mechanical Properties;Wear Resistance- 2
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发布时间：2023-12-18 - 摘要：The heat treatment process and mechanism of QAl10-4-4 aluminum bronze were investigated to explore heat treatment specification for parts conforming to bushing. The microstructure and mechanical properties of QAl10-4-4 aluminum bronze with different solid solution and aging parameters were analyzed by metallographic analysis and tensile test. When the solution temperature is 950 ℃, a large number of β and β′ phases are generated in the structure with a small amount of α phase and k phase residues, which exhibits high strength without cracking tendency.With the increase of aging temperature and holding time, the eutectoid reaction of β and β′ phases tends to be complete, where the strength and hardness are decreased, while the plasticity and toughness are increased. Considering synergetic toughness and plastic toughness, the ideal heat treatment system is presented as follows: solid solution at 950 ℃ for 1.5 h and aging at 670 ℃ for 3 h.关键词：QAl10-4-4 Aluminum Bronze;Solution Aging;Mechanical Properties;Metallographic Structure
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发布时间：2023-12-18 - 摘要：The technical level of bronze casting and the super skill of bell crafts men more than 2 400 years ago were revealed by introducing the techniques and methods of using modern foundry technology to restore Dayu Bell of Guxi in The Chime-bells of Marquis Yi. The research and practice of restoring and casting Dayu Bell of Guxi presents the original appearance before The Chime-bells of Marquis Yi was buried, which is of historical and practical significance for inheriting and carrying forward the bronze casting technology and bell casting technology in China.关键词：Dayu Bell of Guxi;Reproduction;Restoration
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发布时间：2023-12-18 - 摘要：The effects of magnetic induction intensity and treatment time on the properties of drying hardened sodium silicate molding sand were investgated through treating sodium silicate with magnetic separator.It is found that the optimited treatment scheme of sodium silicate in low-intensity magnetic field is magnetic induction of 0.4 T and magnetization treatment time of 30 min, where the strength of molding sand can be increased by about 37%, and the amount of sodium silicate in molding sand can be reduced by 20%. The results show that the viscosity of sodium silicate can be reduced and the dry compressive strength of sodium silicate sand can be improved by low magnetic field treatment. The sand mold made of magnetized sodium silicate should be paid more attention to moisture-proof than that of unmagnetized sodium silicate.关键词：Sodium Silicate;Low-intensity Magnetic Field;Molding Sand;Strength
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发布时间：2023-12-18 - 摘要：Mould shell damage and falling off may lead to casting surface slag and internal inclusion defects, which directly affect the product quality. The use of water washing process in production can ensure the cleanliness of mould shell, effectively avoiding the defects. One of shell materials widely used in investment casting of titanium alloy is surface layer of rare earth powder+zirconium glue+zirconium sand with the back layer of zirconium powder+silica sol+Mullite（1#glue）, and the other is surface layer of rare earth powder+neutral glue+zirconium sand with the back layer of mullite powder+silica sol +Mullite（2# glue）. The water washing testing was conducted on both materials, and the results indicate that the shell of 1# glue is not suitable for washing due to the remelting phenomenon, while the shell of 2# glue can be washed. By comparing the drying effect at different holding temperature and holding time, the amounts of surface and internal defects are decreased by above 20% after optimizing the shell washing process.关键词：Titanium Alloy;Investment Castings;Water Washing;Mould shell
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发布时间：2023-12-18 - 摘要：In view of the technical difficulties that the titanium alloy shell castings had high requirements for the surface quality of the runner, the graphite ceramic composite mold was selected. Meanwhile, the casting simulation software was utilized to optimize the design of gating system to avoid the generation of large-scale shrinkage defects, and to improve the internal quality of castings. Moreover, the mechanism that ceramic materials improve the surface quality of castings was clarified combined with software calculation and theoretical analysis.关键词：Titanium Alloy Castings;Graphite Ceramic Composite Mold;Gating System;Casting Simulation
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发布时间：2023-12-18 - 摘要：<正>经协会六届常务理事会第六次会议讨论,协会现定于2022年2月25～26日在苏州召开"苏州市压铸技术协会六届理事会第三次年会暨2021中外压铸技术交流会",诚邀协会各理事、会员、专家莅临参加,也欢迎压铸界新老朋友共聚、交流!具体内容如下:一、主题:技术引领、服务行业二、时间:2022年2月25～26日三、地点:苏州高铁金科大酒店（苏州市高铁新城南天城路67号—高铁北站对面）
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发布时间：2023-12-18 - 摘要：<正>近年来,全球经济格局正在发生深刻的变化,随着"双碳"经济新模式的开启,汽车轻量化方兴未艾!而以高真空压铸为基础的大型薄壁铸件一体化压铸技术以及面向中、厚壁铝合金铸件解决方案的挤压铸造技术在新能源汽车上的轻量化战略中愈显重要!铝、镁合金压铸件在新能源汽车市场的渗透率在不断提高,使人们重新认识和定义"压铸",压铸行业也迎来了空前的机遇与挑战。压铸是什么?压铸能做什么?压铸企业该如何做好定位?形成核心竞争力,以适应复杂的环境与形势,
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发布时间：2023-12-18 -
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