最新刊期
卷 40 ， 期 1 ， 2020
- 摘要：Mg99.9-3xZnxY2xZr0.1（x=0.5,1,2,molar fraction,%）alloys reinforced with LPSO structure was prepared by rheo-squeeze casting.Microstructure and mechanical properties of the alloys prepared were investiagted.The results reveal that rheo-squeeze casting can refine effectively the microstructure of the alloys.The matrix structures of the alloys are composed of largerα1-Mg and smallerα2-Mg grains.The LPSO structure is distributed uniformly in the grain boundary.The lower the content of LPSO structure is,the more obvious the refining effect is.With the increase of squeeze pressure,the thickness of LPSO structure in the alloys is decreased.After the squeeze pressure reaches 100 MPa,the thickness is changed slowly with increasing in pressure.Compared with conventional gravity casting,rheo-squeeze casting can improve effectively the mechanical properties of the alloys,especially for the elongation,where the tensile strength and elongation of the rheo-squeeze casting Mg96.9Zn1Y2Zr0.1 alloy under 400 MPa are improve by 19%and 170%,respectively.关键词：Mg-Zn-Y-Zr Alloys;LPSO Structure;Ultrasonic;Rheo-squeeze Casting;Microstructures and Mechanical Properties
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发布时间：2023-12-18 - 摘要：The Sn-58 Bi solder ribbon was prepared by the twin-roll rapid solidification technique,and the Cu/Sn-58 Bi/Cu linear solder joints were prepared.The interface IMC,element diffusion and microstructure evolution of solder joints were analyzed by EPMA and EDS after the current density of 1×104 A/cm2（25 ℃）.The results reveal that the morphology of the anode IMC layer is changed from scallop shape to zigzag shape,and the cathode IMC layer is changed from scallop shape to irregular one with the increase of thickness gradually.Bi is segregated toward the anode to form a Bi-rich layer,and Sn is segregated at the cathode.And the matrix eutectic structure（Bi+β-Sn）is coarsened.Based on linear fitting,the growth coefficient n of IMC layer of the anode and cathode are 0.263 and 0.442,respectively,and the growth mechanism is attributed to volume diffusion.关键词：Sn-58Bi Solder;Rapid Solidification;Microstructure;Electromigration Behavior
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发布时间：2023-12-18 - 摘要：In order to understand influence of internal cooling with annular electromagnetic stirring（IC-AEMS）treatment,the precipitation behavior of the primary Al3Zr phase and the solidification structure of Al-Zn-Mg-Cu alloy,was investigated by optical microscope（OM）and scanning electron microscope（SEM）.The results show that with IC-AEMS,the morphology of Al3Zr particles is transformed from needle and plate-like to small and finely distributed blocks.Compared with the microstructure of the Al-Zn-Mg-Cu alloy without IC-AEMS,the refining effect and uniformity of the microstructure is improved greatly with IC-AEMS treatment,where the average grain size is reduced from 387μm to 218μm.关键词：Annular Electromagnetic Stirring;Primary Al3Zr;Refinement
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发布时间：2023-12-18 - 摘要：<正>当今国际形势正经历着复杂而深刻的变化,给中国汽车零部件行业发展带来了诸多不确定性。作为中国汽车零部件行业的关键自主品牌产品,铝车轮既有巨大的汽车保有量和产销量的优势空间,又有贸易摩擦带来的海外市场动荡的风险黑洞。在此大环境下,铝车轮生产企业市场竞争日益激烈、利润空间持续走低。为了促进铝车轮行业加快调结构、稳增
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发布时间：2023-12-18 - 摘要：<正>近日,在北京发布的《中国5G经济报告2020》显示,2020年,5G商用将在中国拉动投资9 000亿元。报告预计,2020年中国5G总投资为0.9万亿元,2025年将达到1.5万亿元。据报告,移动终端、泛娱乐、工业互联网、汽车行业、医疗健康5大先锋行业将率先受益于5G。同期,工业和信息化部原部长李毅中在会上表示,在5G网络建设上,
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发布时间：2023-12-18 - 摘要：<正>爱驰汽车U5为一款纯电动中型SUV车型,于2019年12月中旬正式上市。在其车身结构方面,爱驰U5采用了上钢下铝车身设计,下车身从轻量化与吸能考虑,采用了铝合金结构,包括:挤压铝合金前碰撞横梁、一体铸造式铝合金减震塔、真空压铸铝合金横梁和纵梁等。底盘部分大量采用铝合金。爱驰U5用铝比率为52%,其中:铝板为
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发布时间：2023-12-18 - 摘要：<正>随着中外全铝车身、钢-铝混合车身的乘用车研发与陆续上市、铝合金罐式专用车的大规模运营,车身与车罐铝合金板材潜在消费量将大量增加。根据北京佰汇方略信息咨询有限公司调研,2019年中国汽车车身铝合金板材潜在产能增加不少于40万t,包括新建产能20万t(宝武铝业10
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发布时间：2023-12-18 - 摘要：<正>鉴于中国交通铝/镁轻合金占比与欧美国家的差距仍然较大,有实力的铝/镁材料加工企业和铝/镁合金铸造企业将继续调整优化产品结构,向汽车、轨道交通、3C通讯市场领域转型布局。新建交通铝/镁轻合金材料或零部件加工项目将定位于优势区域,投资目的地将兼顾用户集中消费区域或原材料资源丰富且成本低廉的地区。
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发布时间：2023-12-18 - 摘要：<正>由云南楚丰新材料集团全资子公司攀枝花云钛实业有限公司（下称攀云钛公司）自主研发设计、制造加工的全国产化大型电子束冷床熔炼炉（以下简称EB炉）在四川省盐边钒钛产业开发区建成投产,第一块长度为6m、宽1.55m、高0.21m、质量达10t的钛扁锭出炉,标志着该公司EB炉全国产化项目热负荷试车成功。此次建成投产的3号EB炉是攀云钛公司投资5亿元建设的"低成本高端钛锭熔铸及延伸加工项目"的5个子项目之一,是
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发布时间：2023-12-18 - 摘要：<正>近日,在中国香港举行的一年一度的"2019香港工商业奖"颁奖典礼上,力劲集团研发的DCC5000大型智能压铸单元获"设备及机械设计奖"。据悉,2017年起,力劲集团即开始设计研制50 000kN智能压铸单元,2018年交付给国内汽车零部件研发生产商安徽镁美科技有限公司,用于镁美公司新能源汽车电池壳生产。大会评审委员会意见指出,DCC5000是世界上同类产
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发布时间：2023-12-18 - 摘要：<正>2019年9月23日工业和信息化部发布《重点新材料首批次应用示范指导目录（2019年版）》（征求意见稿）,5505、5182、5754、6016合金牌号的汽车用高性能汽车用铝合金薄板,新能源汽车动力电池外壳用铝合金带材,新能源汽车高性能动力电池铝箔和汽车用6xxx系铝合金型材列入其中。此外,一种镁合金轮毂和汽车、轨道交通、航空航
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发布时间：2023-12-18 - 摘要：In order to reduce the"stray grain"presented in laser restoration layer on single crystal superalloy,an energy-retrained laser epitaxial restoration（ERLER）process was put forward.The effects of laser power and the width of single crystal superalloy base metal on the morphology and microstructure of restoration layer were investigated.The results reveal that,the restoration layer produced by ERLER process possesses directionally epitaxial grains in almost entire layer,and the formation probability of"stray grains"is decreased greatly.Under the optimized parameters,continuous epitaxial grains can be obtained in restoration layer with a thickness of 1 220μm.With the increase of laser power,the layer thickness is increased to some extent.At the same laser power and laser spot diameter,the layer thickness is increased and then decreased with flattening morphology when the base metal width is increased.For the case of 3 mm width,obvious flow paths are presented in the restoration layer.Combined with the photos taken by high-speed camera,the flow behavior in the laser molten pool can be revealed as follows:the metal firstly rised up from bottom of molten pool center to surface and spreaded to around,then flowed back to the center bottom along with the molten pool bottom.关键词：Laser Epitaxial Restoration;Single Crystal Superalloy;Energy Retraining
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发布时间：2023-12-18 - 摘要：The effects of Si,Mn and Fe elements alloying on the high temperature properties and microstructure of ultrathin aluminum alloy fins were investiagted by high temperature tensile test,optical microscope and scanning electron microscope.The results reveal that the strength of 3003 and 3003 mod aluminum alloy is decreased with the increase of tensile temperature,while the elongation is increased firstly and then decreased.The yield strength of alloy-modified ultrathin 3003 mod at 500 ℃is 32.2% higher than that of 3003 alloy.The number of nanoscale particles in 3003 mod aluminum alloy is increased significantly with alloying,and the micronscale particle number is reduced.The characteristic of microstructure of 3003 mod alloy can suppress secondary recrystallization nucleation of the ultrathin foil in the process of high temperature tensile,leading to more coarse grain and bigger aspect ratio compared with the 3003 alloy at the same tensile temperature.The secondary recrystallization is mainly respeosnible for the sharp decrease of the elongation of the two alloys compared with that at 300℃.关键词：3003Aluminum Alloy;Alloying;High Temperature Strength;Recrystallization;Particles
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发布时间：2023-12-18 - 摘要：2 A14 aluminum alloys wheel hub forging blank with different Sc contents were prepared by casting and isothermal compound forging.Effects of Sc additions on the mechanical properties and microstructure of 2 A14 aluminum alloy wheel hubs were investigated.The results reveal that the grain in the 2 A14 aluminum alloy can be refined greatly,and most of the grains present equiaxed grain with the addition of Sc element to 0.3%.Although the Sc element can improve the elongation of the 2 A14 aluminum alloy wheel hub,it can reduce significantly tensile strength to below 400 MPa,which is mainly related to the fact that the Sc element can consume Cu elements in the 2 A14 aluminum alloy,resulting in a decrease of strengthening phaseθ′-Al2 Cu.However,the Sc element can inhibit recrystallization,narrow the performance difference between the various parts of the alloy hub,and thus improving the thermal stability.关键词：Aluminum Alloy Wheel Hubs;Sc;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Ag-Ni alloys with Ni-rich particles uniformly dispersed in Ag matrix were prepared by rapid/sub-rapid solidification method.A model describing the microstructure evolution during cooling of Ag-Ni monotectic alloy melt was proposed.The solidification process of Ag-Ni alloy has been simulated and discussed in details.Effects of alloy composition on microstructure formation of Ag-Ni alloy were analyzed.The results demonstrate that the average radius of the Ni-rich particles is increased with the increase of nickel content.The Ostwald coarsening of the Ni-rich droplets/particles is very weak during the solidification process of a Ag-Ni alloy melt,which is controlled by nucleation and growth.关键词：Ag-Ni Alloy;Solidification;Microstructure;Simulation
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发布时间：2023-12-18 - 摘要：In the experiment of the effects of the particle size of quartz powder on the performance of coatings,the mixture of quartz powder with different particle size was used as refractory aggregate,sodium bentonite and CMC as suspension agent,starch aqueous solution and water glass as binder and water as carrier.Four key performances were selected for orthogonal experiment by single variable experiment.Orthogonal experiments were carried out on four factors and four levels by mixing four aggregates with different particle sizes and adding four different additions.The range method was used to analyze influence of various factors on the performance of coatings,and a group of combinations with the satisfied comprehensive performance were presented,and the performance of the combinations was analyzed.The results reveal that when the content of refractory aggregate is80% of 240 mesh,80% of 270 mesh,80% of 300 mesh,20% of 320 mesh,the comprehensive performance of quartz powder coating presents desirable.关键词：Quartz Particle Size;Coating Properties;Orthogonal Experiment
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发布时间：2023-12-18 - 摘要：Great progress has been achieved in the preparation of ZTA（zirconia toughened alumina）ceramic particle reinforced iron matrix composites by infiltration method.The research progress was reviewed for ceramic preform preparation,infiltration of liquid iron into ceramic preform,wettability of ceramic and liquid iron,interfacial bonding of composite materials and wear resistance of composite materials.It is concluded that the wettability of molten iron with the preform is a prerequisite for the realization of infiltration.The common methods include adding active elements to ceramic preform,modifying ceramic surface by electroless plating,vapor deposition and coating,etc.The formation of transition layer between ceramics and metal matrix can improve the structure of interface and promote metallurgical bonding between ceramics and metal matrix.The infiltration mechanism of molten iron into ceramic preforms and the wear resistance mechanism of ZTA ceramic composites need to be further analyzed.关键词：ZTA Ceramic;Iron Matrix Composites;Infiltration;Interfacial Layer
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发布时间：2023-12-18 - 摘要：In the post-processing of cast CAE,it is necessary to fill the isolated gas phase of the casting,however as the complexity of the casting increases,the scanning line seed filling algorithm cann’t adapt to the demand of the massive data generated by the casting CAE post-processing module.By modifying the original algorithm,the stack structure was modified,so that the scanned line segments and the filled cells didn’t need scanned and filled,respectively,which reduced the amount of calculation data,and the parallel calculation greatly saved the filling and display time.The results of several examples show that the improved algorithm can improve the display speed of isolated areas of complex castings,and with the filling area increase,the more time is saved.关键词：Scan Line Seed Filling Algorithm;Casting CAE;Isolated Area;Gas Phase
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发布时间：2023-12-18 - 摘要：Aimed at the X-plate part structure and characteristics of the squeeze casting process,the pouring mode,overflow system and cooling system of the original super slow die-casting were redesigned to be suitable for the squeeze casting.The AnyCasting software was used to analyze comparatively the die before and after modification,where the internal shrinkage defects of the products simulated before modification are consistent with the actual state.Through changing the pouring method,expansion vents and overflow slot,the gas is exhausted smoothly during the liquid filling of the mold cavity.The cooling water system was set to control the mold temperature to ensure the sequential solidification of the product during the cooling process,which can eliminate the internal shrinkage defects in the product.The squeeze casting aluminum alloy X plate presents the sound structure,and mechanical properties are closed to forging ones after T6 heat treatment.关键词：Squeeze Casting;Super Slow Die-casting;Die Casting Die;Shrinkage Porosity;AnyCasting Software
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发布时间：2023-12-18 - 摘要：The process of the shell aluminum alloy die-castings was analyzed.The structure design of the die-casting die for the horizontal cold-press chamber die-casting machine was introduced in detail,including the parting surface selection,the gating system design,the side core pulling design and the demoulding mechanism design.The working principle and structural characteristics of the die-casting die were expounded,which provided a reference for the design of die-casting die structure for horizontal cold-press chamber die-casting machine.关键词：Aluminum Alloy;Die Casting Die;Die Casting Process
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发布时间：2023-12-18 - 摘要：The effects of low-speed process on the porosity,microstructure and mechanical properties of YZAlSi9 Cu3 die-casting parts were investigated by means of optical microscopy,X-ray inspection and mold flow analysis,etc,combined with orthogonal test and mechanical testing.The experimental results show that the air hole in the machining surface of an engine cylinder block is mainly caused by the unreasonable design of the low speed process.When the slow injection speed is more than 0.4 m/s,the entrapped-gas volume of the castings is increased,and the liquid of the piston is more than the piston oil,so comprehensive performance is decreased.When the slow injection low speed is 0.2 m/s,the casting structure presents sound with a little slag content and low porosing,so the mechanical properties are desirable.关键词：Cylinder Block;Slow Shot;Orthogonal Test;Entrapped-gas;Mechanical Properties
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发布时间：2023-12-18 - 摘要：ZL305 alloy containing Ce and La elements was prepared by squeeze casting and permanent mould casting.The effects of squeeze casting as well as Ce and La mixed additions on the microstructure and mechanical properties of the alloy were analyzed.The results reveal that the Ce and La mixed addition can reduce positively the grain size of ZL305 alloy prepared by permanent mould casting and the mechanical properties reach the satisfied values with 0.1% mixture RE addition,where the tensile strength and elongation are increased to 227.88 MPa and 6.47%,respectively.The squeeze casting process can refine grain size,which are responsible for the improvement of mechanical properties,such as elongation and tensile strength.With 0.2% of mixture RE addition,the tensile strength and elongation are increased to 302.35 MPa and 7.23%,respectively.After T6 solution treatment at 430℃for 10 h,mechanical properties of the squeezed casting alloy are enhanced obviously.关键词：Squeeze Casting;Rare Earth;Aluminum Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：<正>澳大利亚莫纳什大学（Monash University）启动了新型镁合金研究项目,开发一种技术可以用于制造强度更高、质量更轻的镁合金,从而提高汽车和航空航天业产品的结构完整性。莫纳什大学、澳大利亚联邦科学与工业研究组织（CSIRO）和重庆大学的研究人员在电子电压较低的环境中,利用具有原子分辨率的X射线图,发现了孪晶边界中合金元素偏析的模式。莫纳什大学材料科学和工程系教授聂建峰表示:"轻质镁具有巨大的节能和环保应用潜力,但是此类材料的偏析容易受到电
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发布时间：2023-12-18 - 摘要：<正>据外媒消息,苹果公司日前表示,它已经从全球两个铝业巨头的一家合资企业购买了全世界第一批无碳铝。这种金属是由位于加拿大蒙特利尔的美国铝业公司（AlcoaCorp）和力拓（Rio Tinto）的合资企业Elysis生产的。Elysis公司表示,无碳铝制造工艺的运营成本预计低于传统的铝冶炼。这些无碳铝将于近日从位于匹兹堡的美国铝业研究机
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发布时间：2023-12-18 - 摘要：Aiming at improving the design and manufacture quality of motorcycle frame,based on prototype of a welded motorcross frame,a integrated precision casting motorcross frame was developed by reasonable design of frame structure and casting technology.FEM analysis shows that strength and stiffness in limit static analysis and frequency of free modal analysis of the whole casting frame are obviously superior to those of the initial ones.The trial-made frame products present the satisfied quality,and its fatigue life is increased significantly and its weight is reduced by 5%compared with the original frame.The results show that large thin-walled integrated precision casting technology is of important significance to improve product quality,reduce cost and increase production efficiency.关键词：Large Thin-walled Castings;Aluminum Alloy;Motorcycle Frame;Precision Casting
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发布时间：2023-12-18 - 摘要：Based on the twin-belt jet cooling caster which was designed to prepare the amorphous alloys strip,a VOF three-dimensional thermal-hydraulic coupling model of molten pool was established by considering interactions between liquid and air layer.The rationalization of the new feeding system structure design was validated by comparative analysis.The influence of nozzle angle and immersion depth on flow and temperature fields distributions was investigated.The results show that the new feeding system can reduce level fluctuation in side confinement effectively,and both flow and temperature field present a kind of"double waves"phenomenon with nozzle angle and immersion change.With every additional 15°nozzle angle of the feeding system,the liquid surface speed waves are reduced by 0.015 m/s and the temperature waves are reduced by 10℃,while each additional 5 mm immersion depth,the liquid surface speed waves are reduced by 0.01 m/s and the temperature waves are reduced by15℃.In addition,flow and temperature fields are distributed more reasonable when nozzle angle is 30°and immersion depth is 25 mm.关键词：Twin-belt Caster;Amorphous Alloy Plate;Molten Pool;Fluid Flow and Heat Transfer;Numerical Sim-ulation
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发布时间：2023-12-18 - 摘要：A method was proposed of opening a circular arc groove at the bottom of the crystallizer to improve the uniformity of microstructure and composition of the horizontal continuous casting Cu-15 Ni-8 Sn alloy.Firstly,based on the temperature field simulation of horizontal continuous casting process of the alloy,influence of crystallizer structure with different arc groove angle,length and thickness was analyzed on temperature distribution in crystallization zone.Then,based on the optimized circular arc groove crystallizer and the crystallizer without the circular arc groove,a horizontal continuous casting process for a 65 mm diameter ingot was carried out.The results reveal that with the increase of the angle,length and thicknessof circular arc groove,the relative horizontal distance of the upper and lower solid-liquid interface is decreased,and the axial angle between the solid-liquid interface and the bar is tended to be 90°.Meanwhile,the temperature field uniformity of the billet is improved obviously during solidification.When the slot angle is 180°,the slot length is 144 mm and the slot thickness is 5 mm for the circular groove,the relative horizontal distance between the upper and lower solid-liquid interfaces is only7%to that without the circular groove.Due to the more reasonable temperature distribution,the uniformity of the microstructure and composition of the horizontal continuous casting Cu-15 Ni-8 Sn ingot is improved greatly.关键词：Horizontal Continuous Casting;Cu-15Ni-8Sn Alloy;Crystallizer Structure
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发布时间：2023-12-18 - 摘要：316 Lstainless steel porous structures with three different topological units,BCC,FCC and FCCZ,were fabricated by selective laser melting technology.The feasibility of forming complex porous structure with SLM technology was verified.Quasi-static compression tests were carried out on the specimens,and the deformation modes and mechanical response curves of porous structures during compression were presenetd.The mechanical properties of the three structures were analyzed comparatively.The results reveal that the compressive behavior and energy absorption capability of the FCCZ porous structure are superior to those of the BCC and FCC structures,which provides a reference for the design of lightweight structure and energy absorption structure.Quasistatic compression simulation was carried out by using ABAQUS/Explicit software.The simulated results were basically in agreement with the experimental ones.关键词：Selective Laser Melting;316L Stainless Steel;Porous Structure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：In the process design of metal casting, "priority top injection" is the casting principle followed by most metal castings.It was introduced briefly for the practical application of vacuum EPC in the mass production of pipe fittings,large motor shell and ingot mold by top injection process Through adopting top pouring,the system has the features of simple gating system,high production yield,low pouring temperature and saving cost.关键词：EPC;Top Injection;Pipe
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发布时间：2023-12-18 - 摘要：Al matrix composites reinforced by garphene were fabricated by two-step friction stir process associated with powder process,and influence of graphene content on the mechanical and conductive behavior of the composites was analyzed.The results reveal that the properties of Al matrix composites can be changed greatly with the addition of graphene.The composites is increased in hardness and is decreased gradually in the plasticity,while the tensile strength and electrical conductivity of the composites are increased firstly and then decreased,with the increase of graphene content.When graphene content is 3.7%,the ultimate tensile strength of the composites reach 146.5 MPa,which is 78.7% higher than that of the Al matrix without graphene under the same conditions.When graphene content is 1.3%,the electrical conductivity of the composites reach 30.62 MS/m,which is 53.4%higher than that of the Al matrix without grapheme.关键词：Friction Stir Processing;Graphene Content;Al Matrix Composites
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发布时间：2023-12-18 - 摘要：SiC)p/2024 composites with high volume fraction（60%）were prepared by direct thermal powder thixoforming.The effects of forming pressure on porosity,flexural strength and thermal expansion coefficient of the composites prepared were investigated.The results reveal that a higher forming pressure is harmful for the improvement of density of the composites.With the forming pressure of 60 MPa,the flexural strength of the composites reaches 289.33 MPa.With the increase of forming pressure,the thermal expansion coefficient of the composites is increased firstly and then decreased When the forming pressure is 60 MPa,the thermal expansion coefficient of the composites reaches 6.687×10-6 K-1 at 200℃.关键词：Thixoforming;Particle Reinforced;Composites;Forming Pressure
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发布时间：2023-12-18 - 摘要：The alternating magnetic field was applied on ZL205 Aalloy during the vacuum counter-pressure graded pressure casting to understand effects of alternating magnetic field-grading pressure synergistic field on the grain size of ZL205 Aalloy.The results show that under the condition of constant pressure difference of graded pressure,with the increase of the alternating magnetic field intensity,the grain size of aluminum alloy is increased firstly and then decreased.With the increase of the grading pressure difference,when the alternating magnetic field intensity is less than 20 mT,the grain size of the aluminum alloy is refined remarkably under the action of the synergistic field.With the alternating magnetic field strength morer than 20 mT,the grain size of the aluminum alloy is coarsened under the action of the synergistic field.ZL205 Aalloy presents the desirable grain refining effect under the condition of alternating magnetic field intensity of 20 mT and graded pressure difference of 130 kPa.关键词：Alternating Magnetic Field;Vacuum Counter-Pressure Casting;Graded Pressurized Pressure Difference;Grain Size
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发布时间：2023-12-18 - 摘要：Effects of untreated,magnetic field treatment,compound treatment of magnetic field and modifier on morphology and distribution of primary Mg2Si phase in 20 Mg2Si/Al composites were investigated.Effects of different voltage and frequency of magnetic field on primary Mg2Si phase with compound treatment were also described.The results reveal that the size of Mg2Si phase is decreased with magnetic field treatment or compound treatment,and the volume fraction of Mg2Si phase is increased gradually from the center to the edge of samples,showing gradient distribution,however the gradient distribution effect of Mg2Si phase is decreased after compound treatment.When the voltage is in the range of 0～300 Vor the frequency is in the range of 1～10 Hz,with the increase of the voltage or frequency,the size of Mg2Si phase is increased at first and then decreased,where the turning points are 200 Vand 5 Hz,respectively,and the gradient distribution effect is decreased gradually.The variation of wear resistance and hardness of the specimens is basically consistent with the volume fraction of Mg2Si phase.关键词：Pulsed Magnetic Field;Modification Treatment;Compound Treatment;Mg2Si Phase
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发布时间：2023-12-18 - 摘要：The mechanical properties and microstructure of ZL116 alloy with different Mg content by counter-gravity casting were investigated by OM,XRD and tensile testing.The results reveal that the tensile strength of ZL116 alloy is increased with the increase of Mg content with the absence of elongation change.The mechanical properties of ZL116 alloy present desirable by differential pressure casting,then low-pressure casting,while the mechanical properties of the alloy by adjustable pressure casting are less than those of ones by the gravity casting.The strengthening phase Mg2 Si is increased with the increase of Mg content,resulting in the increase of the tensile strength of ZL116 alloy.关键词：Mg;ZL116Alloy;Counter-gravity Casting;Mechanical Properties;Microstructure
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发布时间：2023-12-18 - 摘要：Titanium sponge and electrolytic titanium were used as raw materials for smelting TC4 titanium alloy,respectively.The smelted ingot was hot rolled to investigate the microstructure and mechanical properties of the TC4 rolled sheet smelted by the two raw materials.The results show that the non-uniform microstructure of the sponge titanium TC4 alloy after hot rolling presents more coarse than that of the electrolytic titanium.After the electrolytic titanium TC4 was rolled,it presents a more uniform slender interlacedαphase,which exhibits a similar basket structure.The tensile strength and Rockwell hardness of the sponge titanium TC4 titanium alloy sheet are greatly higher than those of the electrolytic titanium TC4 titanium alloy sheet,however the plasticity of the electrolytic titanium TC4 sheet is the better.The fracture mode of titanium sponge TC4 titanium alloy sheet is characterized by the compound fracture of quasi-cleavage fracture and ductile fracture,while the fracture mode of electrolytic titanium TC4 is characterized by ductile fracture.关键词：Sponge Titanium;Electrolytic Titanium;TC4Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Mg-Zn-Sn alloys with different w（Zn）/w（Sn）mass ratios were prepared in permanent mould,and microstructure and mechanical properties of the as-cast alloys were investigated.The results reveal that when the total amount of Zn and Sn is constant[w（Zn）+w（Sn）=8%],with the w（Zn）/w（Sn）mass ratios increase,the grain boundary of the alloys becomes coarser and the number of second phase or eutectic phase on the grain boundary are increased.The mechanical properties of the alloy are increased firstly and then decreased with the increase of w（Zn）/w（Sn）mass ratios.The alloy with w（Zn）/w（Sn）mass ratios of 5/3 has the desirable strength,where the compressive strength reaches 296 MPa,and the alloy with w（Zn）/w（Sn）ratio of 3/5 has the highest compression ratio of 21.5%.The mechanism was described of addition elements Zn,Sn and w（Zn）/w（Sn）mass ratio affecting strength and toughness of Mg-Zn-Sn alloys.关键词：Mg-Zn-Sn Alloys;w（Zn）/w（Sn） Mass Ratio;As-cast Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：High-entropy alloy FeMoCrVTiSix（x=0,0.3,0.5,1）was prepared by vacuum arc melting process.The microstructure and mechanical properties of the alloy prepared were investigated by X-ray diffraction（XRD）,scanning electron microscope（SEM）,microhardness tester and universal testing machine.The results reveal that the alloy consists of a single BCC solid solution structure with x=0.With the increase of Si,the（MoCrV）3Si phase and the（FeCrVSi）2（MoTi）Laves phase can be precipitated gradually in the alloy,and Laves phase is dominated in the alloy with x=1.With the increase of Si,the brittleness of the alloy is enhanced,and the hardness is increased,reaching a maximum value of 1 113 HV when x=1.关键词：FeMoCrVTiSix High Entropy Alloy;Phase Structure;Microstructure;Precipitates;Mechanical Properties
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发布时间：2023-12-18
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