最新刊期
卷 36 ， 期 4 ， 2016
- 摘要：Effects of V on mechanical properties and microstructure of Al-5.0Cu-0.4Mn-0.1Ti-0.1RE alloy prepared by gravity casting were investigated by tensile testing,optical microscope（OM）,scanning electron microscopy（SEM）and energy dispersive spectroscopy（EDS）.The results show that the tensile strength,yield strength and elongation of the alloy reach the peak value by adding 0.25% V both at as-cast and heat treatment state,which is attributed to the fine grain strengthening effect of V in the alloy.With 0.35%V addition,mechanical properties of the alloy are decreased sharply,which is attributed to excessive V accumulating in the alloy to generate a massive Al10 V phase.During tensile process,the Al10 V phase is broken severely,resulting in the decrease of tensile strength,yield strength and elongation of the alloy.关键词：V;Grain Size;Mechanical Properties;Microstructure
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发布时间：2023-12-18 - 摘要：The effects of Ti alloying on Mg2 Ni hydrogen storage alloy and corresponding hydrides were investigaged.The results indicate that Ti preferentially occupy the Mg（6i）site as the doping concentration in the range from 0to 0.5.The solid solution alloys Mg2x TixNi with the hexagonal structure is easily decomposed into the complex phase with bcc structure Mg3TiNi2 and hexagonal structure Mg2 Ni.The Ti-doping can weaken the interaction between H and Ni atoms and reduce the enthalpy of hydrogen absorbing of the alloy system.Therefore,the ability of the solution of hydrogen for Mg2 Ni hydride can be improved.关键词：Ti Alloying;Mg2Ni;Hydride;Hydrogen Storage
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发布时间：2023-12-18 - 摘要：The surface of AZ91 alloy engine cylinder was modified by surface plasma cladding.The microstructure and phase constituent of AZ91 alloy substrate,TiB2-Al2O3 and varied Al∶（TiB2-Al2O3）compound modified layer were analyzed,and the hardness,wear resistance and corrosion resistance of the modified layer were investigated.The results show that with the increase of distance from the surface of the modified layer,the micro-hardness of the modified layer is decreased gradually,however,the microhardness of the modified layer is the higher than that of AZ91 alloy substrate.The micro-hardness of the modified layer is decreased gradually with the increase of Al content,while the micro-hardness of TiB2-Al2O3 modified layer has the maximum value.With prolonging wear time,the wear weight loss of the substrate and modified layer are increased gradually,and the wear resistance modified layer with w（Al）∶w（TiB2-Al2O3）=1∶2exhibits desirable.The corrosion resistance of the modified layer is improved compared with AZ91 alloy substrate,and the modified layer with w（Al）∶w（TiB2-Al2O3）=1∶2has the satisfied corrosion resistance.关键词：AZ91Alloy;Surface Modification;Wear Resistance;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：AZ31magnesium alloy sheets were welded by laser welding.Effects of ultrasonic power on the microstructure and properties of the welded joint were investigated by optical microscopy,Brinell hardness tester and tensile testing machine.In addition,the average grain size of the welding joint was calculated by the Image-Pro Plus software.The results show that effects of ultrasonic power on microstructure and properties of the coating exhibit very obvious.With increasing in ultrasonic power,the average grain size is decreased from 54μm to 24μm as a result of obvious cavitation effect and acoustic stream.The macro-hardness and tensile strength of the welding joint are increased at first and then decreased.When the ultrasonic power is 1 200 W,the average grain size reaches 24μm.Meanwhile,the macrohardness and tensile strength of the joint reach 56 HB and 286.54 MPa,respectively.关键词：Magnesium Alloy;Ultrasonic Power;Laser Welding;Grain Refinement
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发布时间：2023-12-18 - 摘要：Low temperature soldering alloy Sn-58 Bi for electronic components was prepared by conventional pouring and by ultrasonic vibration assisted pouring.And the microstructure,chemical composition in the micro zone,solderability and mechanical properties of the alloy at different temperature were tested and analyzed.The results show that ultrasonic vibration assisted pouring can improve significantly the mechanical properties and solderability of the alloy.Compared with conventional pouring,ultrasonic vibration assisted pouring can improve the tensile strength at-40 ℃、25 ℃ and 150 ℃ by 70%,72% and 80%,respectively.And it can also decrease the wetting（zero crossing）time by 43%,and increase the maximum wetting force by 36%.关键词：Ultrasonic Vibration;Low Temperature Soldering;Sn-58Bi Alloy;Solderability
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发布时间：2023-12-18 - 摘要：The Al-Si-Mg composite cylinder liner reinforced with in situ primary Si/Mg2 Si particles was manufactured by centrifugal casting,and the forming process of die casting cylinder liner and body was analyzed.According to the experimental data of bench test,the heat conductivility of the cylinder linerbody was calculated quantitatively.It is shown that the "running aluminum alloy liquid" problem in low pressure casting integrated liner and body can be solved through controlling the preheating temperature of the liner and filling pressure as well as setting refractory cotton into the cavity,which can ensure the satisfied bonding between the liner and the body.The calculation results show that compared to the castiron cylinder liner-body,an aluminum cylinder liner-body has the better heat conductivility,and its thermal performance is two times at least than that of iron cylinder liners.关键词：Aluminum Alloy Cylinder Liner Body;Low Pressure Die-casting;Heat Conductivility
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发布时间：2023-12-18 - 摘要：<正>"当前电线电缆行业以铝代铜"过度炒作,乱象凸显。要发挥市场在铜铝资源配置中的决定性作用,兼顾技术可行、安全保障、节能环保等多个方面,让企业和用户理性选择。有关数据显示,无论是纯铝还是铝合金导体,其制成的电线电缆起火概率为铜导体的10倍左右。国务院发展研究中心国研
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发布时间：2023-12-18 - 摘要：<正>美国通用汽车（GM）总部大楼区域在2016年3月24日举行了浙江万丰科技开发股份有限公司（"万丰科技"）并购美国工业机器人厂商Paslin公司的交割仪式。Paslin公司成立于1937年,总部位于美国密歇根州沃伦市,是国际领先的焊接机器人应用系统服务商,以其领先的自动化
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发布时间：2023-12-18 - 摘要：<正>由于稀土价格持续下行,去年我国稀土全行业亏损近8个亿,很多企业面临停产半停产。这是继2014年稀土行业首现全面亏损以来,连续第二年亏损。一位稀土业内专家告诉上证报记者,"去年六大集团中有五家亏损,还有一
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发布时间：2023-12-18 - 摘要：<正>近日,山西省人民政府办公厅发布《关于印发2016年省重点工程项目的通知》,有多个压铸及铸造项目入选"2016年山西重点工程名单"。江铃福特重卡发动机及整车装配项目
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发布时间：2023-12-18 - 摘要：<正>日前,日本三菱综合材料株式会社称,已开发出了从稀土磁铁中高效回收精制稀土元素的技术。该工艺同时采用了干式处理和湿式处理,更为便捷。为了应对回收稀土磁铁的需求大幅增长,该公司未来将开展中试试验,并研究大规模生产方案。
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发布时间：2023-12-18 - 摘要：<正>据报道,日本铝生产商UACJ计划收购一家美国的汽车铝架制造商,希望借此开发北美市场。根据一项协议,UACJ将在5月底前以1.55亿美元的价格收购美国铝架制造商SRS Industries。SRS在美国和
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发布时间：2023-12-18 - 摘要：<正>美国铝业车轮及交通产品公司（Alcoa Wheel & Transportation Products）决定扩大应用于中型商用车的铝轮毂产能,主要针对Mercedes-Benz Sprinter,福特全顺及大众3500和4500车型。此次扩大计划也展示了该公司致力于中型车市场的决心。
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发布时间：2023-12-18 - 摘要：<正>近日,史杰克西（StrikoWestofen）公布了2015年其在亚洲的良好业绩情况,再次展示了强劲的增长能力。在过去3年,史杰克西亚洲实现业绩增长300%之后,又创造了新的记录,订单增长率达27%。其强劲的业绩增长势头源于集团全球领先的有色金属熔
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发布时间：2023-12-18 - 摘要：The finite element models of equal channel angular extrusion（ECAE）with different outer corner radius,inner corner radius and friction coefficient were established to simulate the AZ31 magnesium alloy ECAE process.The characteristics of frictional stress during the whole ECAE process was obtained,and effects of outer corner radius,inner corner radius and frictional coefficient on the peak value and stable value of friction stress were investigated.The ECAE experiment was carried out with a commercial AZ31 magnesium alloy to verify the simulated ones.The method of reducing frictional stress and improving successful rate for ECAE process was also proposed.The results indicate that frictional stress on the left side of specimen and on the right side of specimen has different characteristics with the increase of the distance of specimen during ECAE process.The outer corner radius has a major effect on the peak value and stable value of the right side friction stress,while the inner corner radius has the a major effect on the peak value of the left side friction stress.The frictional coefficient has the major effect on both the peak value and stable value of friction stress curve.关键词：AZ31Magnesium Alloy;ECAE;Friction Stress;Peak Value;Stable Value
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发布时间：2023-12-18 - 摘要：The design thought of the weight compatible type ingot was illustrated,and AnyCasting software was adopted to predict the solidification quality of 3945tweight ingots and to understand the relationship between dimension parameters of the weight compatible type ingot and the temperature as well as solidification defects of ingot.The results reveal that different dimension parameters,such as slender ratio increased from 1.437 to 1.737,taper decreased from 4.89% to 4.01% at the volume-riser of 14.52%,of ingot mold on effects of the solidification sequence of ingot can be ignored.And C element segregation distribution is slightly related with the increase of the weight of ingot.The depth of the first shrinkage is decreased,and position of the shrinkage porosity at the vertical line of the ingot shifts down with the increase of the weight of ingot.关键词：Weight Compatible Type Ingot;Numerical Simulation;Dimensions Parameters;Solidification Quality
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发布时间：2023-12-18 - 摘要：The structure characteristics and the key points in technological design of new type overloaded railway wagon bolster were analyzed.Based on the workshop production condition,the production process was determined.The InteCAST software was adopted to visualize flow field and temperature in filling and solidification process to predict shrinkage hole（porosity）.Finally,the casting process of product was optimized,and completeness of process was realized,so the bolster was produced successfully.关键词：Bolster;Casting Process;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Gating system was designed preliminarily based on the structure characteristics of the die casting aluminum alloy shell.The filling process of die casting shell was simulated by means of the InteCAST software.Based on the simulated results,four overflowing slots were set at the position of the first filling and the last filling as well as confluence.The designed gating and overflow system can obtain satisfied results through practical production,and casting defects such as gas hole in the die casting shell were low.关键词：Die Casting Shell;Gating and Overflow System;Numerical Simulation;Casting Defects
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发布时间：2023-12-18 - 摘要：By using Fluent software,for vacuum and die casting cavity vent groove shape and the influence of the exhaust air rate was simulated.Results show that vacuum in the cavity can greatly improve the exhaust rate,meanwhile,for die casting,vacuum exhaust slot shape has the obvious effect on vacuum die-casting exhaust rate,in which the gradient type and large cross-sectional area in the shape of exhaust slot is more beneficial to vacuum.关键词：Die Casting;Exhaust;Pumping Air into Vacuum State
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发布时间：2023-12-18 - 摘要：The A356 alloy automotive sub-frame was produced by indirect squeeze casting.The process scheme and the processing parameters of indirect squeeze casting were determined.The sub-frame was manufactured successfully with the advanced 2000 Tvertical squeeze casting machine.The microstructure and mechanical properties of the sub-frame have been investigated by tensile testing,optical microscope and scanning electronic microscope.The results reveal that the sub-frame castings exhibit the satisfied appearance with compact structure and absence of casting defects with the pouring temperature of690710℃,the casting pressure of 95 MPa,the mold temperature of 240℃and the holding time of 20 s.The tensile strength,elongation and hardness of aluminum alloy sub-frame specimen after T6 heat treatment can reach 291 MPa,9.2% and 96 HBW,respectively.With the bench test,the requirements of fatigue property can be satisfied and the lightweight level of vehicle is improved.关键词：Sub-frame;Aluminum Alloy;Squeeze Casting;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Aimed at structural features of aluminum alloy joint part,the low pressure casting mould and process were designed.At the same time,key points of the design on mold structure were described from several aspects,such as mold parting surface,cavity size,mold wall thickness,exhausting system and core-pulling way and so on.Numerical simulation results indicate that liquid metal is filled smoothly,and sequential solidification can be realized with desriable feeding effect.Thereby,reasonability of the low pressure casting and the mold structure were verified.关键词：Aluminum Alloy;Case Joint;Low Pressure Die Casting;Mold Design
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发布时间：2023-12-18 - 摘要：The needle hole can be observed in the processed plane of camshaft bracket in the production process.Although the air vent was set at corresponding place of mold,there still was absent in remarkable improvement on the defect of pore.In order to understand origination of the gas hole,based on the CAE technology,the filling and solidification process was simulated.According to the simulated result,the exhausted-overflow system was modified.The results reveal that gas holes in the camshaft bracket are decreased obviously by actual production,and product quality is improved.关键词：Needle Hole;Simulation;Exhausted-overflow System
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发布时间：2023-12-18 - 摘要：According to the unsteady heat transfer theory,temperature model of die casting die cavity surface during multiple die casting cycles was analyzed.The temperature to time curves of different depth points from cavity surface and temperature fluctuation profile in thermal equilibrium state were analyzed.The results reveal that the point at the near distance from cavity surface exhibits a large temperature fluctuation,short time for reaching heat balance and high temperature difference of heat balance.Cavity surface of die casting die is the most failure zone.关键词：Die Casting Die;Temperature Field;Model;Copper Alloy
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发布时间：2023-12-18 - 摘要：ZG03Cr22Ni5Mo3N dual phase stainless steel jetting blade with complicated shape was produced by investment casting.In order to prevent the casting deformation,process parting surface was designed with perpendicular face+inclined plane+complex parting of three dimensional curved surface.The moulds adopts a multi-mode combination technology to reduce deformation of the mold.During the investment casting process,the process method and the technical parameters should be controlled reasonably.In addition,the auxiliary process equipments of different anti-deformation were designed.Thus,qualified jetting blade was manufactured.关键词：Jetting Blade;Process and Mould Design;Anti-Deformation Technology
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发布时间：2023-12-18 - 摘要：A BaZrO3-coated Al2O3shell-mould was prepared for the precision casting of titanium alloys.The mixed BaZrO3 powder was added to the slurry of face layer,which was composed of 50%fine powder（-325mesh）and 50%fine powder（-200+325mesh）.After sintered for 4hours at 1 500℃,the inner surface of mould exhibits smooth with absence of obvious crack.After titanium alloys pouring,the interaction between BaZrO3 and alloy was analyzed by OM and SEM.Theα-layer’s thickness near interface was measured by micro-hardness tester.The results reveal that apparent interaction and diffusion of elements in the interface can not be observed,while there exists someα-layer with about 6080μm in thickness.关键词：BaZrO3-coated Al2O3Shell-mould;Titanium Alloy;Precision Casting;Interaction
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发布时间：2023-12-18 - 摘要：Numerical simulation technology is an important method which based on the flow and solidification theory of polymer materials for investment casting process to research wax prepared.In this paper,we use experimental method to determine the basic performance parameters of wax.Firstly,use the capillary rheometer to test the rheological properties of wax with the Cross-WLF viscosity model to fit the viscosity model parameters.Secondly,the Netzsch type of differential scanning calorimeter was used to analysis the thermal properties of the wax.Finally,the indirect heat expansion analyzers was used to measure PVT properties of wax.By the performance of wax such as thermal,mechanical,rheological,compressibility,it can achieve numerical simulation during wax injection molding process,which can improve the dimensional accuracy and quality of wax pattern for investment casting,this laid a theoretical basis.关键词：Wax Material;Investment Casting;Rheology;Thermal Performance;PVT Performance
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发布时间：2023-12-18 - 摘要：<正>2016年,是"十三五"规划实施的开局之年,也是《中国制造2025》战略有序推进的关键之年,刚巧又适逢中国铸造协会成立30周年,中铸协将依托"第二届中国铸造节"这个平台,推动中国铸造业持续健康发展。
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发布时间：2023-12-18 - 摘要：<正>2016年1月31日,重庆大学国家镁中心、重庆市科学技术研究院与重庆博奥镁铝金属制造有限公司在重庆万盛经开区平山工业园区签订了战略合作协议,重科院院长、国家镁中心主任潘复生教授和重庆博奥镁铝金属制造有限公司总经理黄家伟分别
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发布时间：2023-12-18 - 摘要：The bottom and top gating system of ductile iron lift arms in lost foam casting process was designed.The filling and solidification of two kinds of gating system were simulated by ProCAST.A step gating system scheme was proposed to solve the shrinkage or porosity defect appearing in the bottom and top gating system scheme,and the modified design was simulated.The results demonstrate that the multi-step gating system can reduce effectively the severe shrinkage or porosity defect.The comparison between the practical production and simulation verifies the feasibility of the proposed scheme.关键词：Lost Foam Casting;ProCAST;Thermophysical Model;Ductile Iron
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发布时间：2023-12-18 - 摘要：Ceramic materials have been extensively used in armor applications due to their desirable properties,such as high hardness,high strength,high toughness and low density.Based on the results of the dynamic impact behavior and failure mechanism,dynamic fracture and failure processes under different stress state as well as the dynamic mechanical behavior were approached.Meanwhile,the stressstrain relation was analyzed,and some methods of testing dynamic fracture toughness were described briefly.In addition,the development direction of dynamic fracture of ceramic was expounded.关键词：Ceramic Armor Materials;Dynamics;Structural Damage;Failure Mechanism
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发布时间：2023-12-18 - 摘要：Hypereutectic Al-Si alloy hollow billets with φ106mm/φ60mm in diameter were fabricated by direct-chill casting.Combined numerical simulation with casting experiments,effects of casting speed on casting process and microstructures of the hollow billet were analyzed.The results reveal that with increasing in the casting speed,the sump depth is increased,and the height and the maximum temperature of remelting layer at the inner wall are increased gradually.When the casting speed reaches 240 mm/min,a significant Si-deplete layer is formed at the inner wall,which is attributed to the melt convection at the solidification front.When the casting speed reaches a certain value that the absorption ability of Si atoms or cluster is the lower than that of breaking away at the solidification front,the Si-deplete layer can be formed.关键词：Hypereutectic Al-Si Alloy;Primary Si;Numerical Simulation;Casting Speed;Hollow Billet
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发布时间：2023-12-18 - 摘要：Solid-liquid interface morphology of titanium ingot during continuous casting process was observed and analyzed to understand effects of drawing velocity and casting temperature.The finite element method was used to simulate continuous casting solidification process of large-sized titanium ingot prepared by the electron beam cold hearth melting furnace.Effects of casting temperature and drawing velocity on the solidification interface morphology and solid fraction were analyzed by calculating the steady state temperature field of solidification of the titanium alloy.关键词：Electron Beam Cold hearth Melting Furnace;Large-sized Ingot of Titanium;Drawing Velocity
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发布时间：2023-12-18 - 摘要：<正>专利申请号:CN201310098984.7公开号:CN104070132A申请日:2013.03.26公开日:2014.10.01申请人:美国通用电气公司本发明涉及一种用于涂覆在泡沫模型上以形成消失模铸造所需的泡沫模样的耐火浆料,其包含可对所述泡沫模
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发布时间：2023-12-18 - 摘要：<正>专利申请号:CN201410224775.7公开号:CN104070141A申请日:2014.05.24公开日:2014.10.01申请人:芜湖浙鑫新能源有限公司本发明公开了一种稀土包覆氧化镁基陶瓷型芯,其特征在于它是由下述质量分数的原料组成的:矿化剂5%10%、增塑剂10%17%、聚乙烯粉1.0%1.5%、余量为
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发布时间：2023-12-18 - 摘要：<正>专利申请号:CN201310168848.0公开号:CN104070153A申请日:2013.03.28公开日:2014.10.01申请人:美国通用汽车环球科技运作有限责任公司本发明提供一种形成双金属铸件的方法。在一种方法中,提供限定了基底表面的具有期望的基体形状的金属预成型体。从基底表面去除自然氧化层,产生清洁的金属预
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发布时间：2023-12-18 - 摘要：<正>专利申请号:CN201410310131.X公开号:CN104070130A申请日:2014.06.30公开日:2014.10.01申请人:铜陵市青铜时代雕塑有限责任公司本发明公开了一种制造青铜型壳原料配方,由下列重量份的原料制成:高强度石膏2560份,氯化铵27份,
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发布时间：2023-12-18 - 摘要：<正>专利申请号:CN201420135263.9公开号:CN203862958U申请日:2014.03.25公开日:2014.10.08申请人:苏州市华宏精密铸造有限公司本实用新型公开了一种回收热节能脱蜡炉,包括脱蜡炉进水管、脱蜡炉排气管、软化水进水管和回收热水箱,软
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发布时间：2023-12-18 - 摘要：<正>专利申请号:CN201420278642.3公开号:CN203853542U申请日:2014.05.28公开日:2014.10.01申请人:米成群本实用新型公开了一种浸没式铝及其合金液体加热装置:其包括浇注料炉,浇注料炉具有U型腔,所述U型腔一侧腔体顶端为进
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发布时间：2023-12-18 - 摘要：Effects of the heat treatment on the microstructure and mechanical properties of 2A14/A390 composites were analyzed.2A14/A390 composites were prepared by hot extrusion combining with casting technology,and the composites prepared were treated by solid solution,and microstructure,microhardness and bonding strength of the composites after solid solution treatment were investigated.The results show that with solid solution at 500℃for 4h,the composites have desirable microstructure and mechanical properties.关键词：Bimetal;Solution Treatment;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Al-Si composites reinforced with single nano,single micro and hybrid nano-micro SiC particles were fabricated by vacuum hot pressing sintering.The friction and wear properties of the particles reinforced Al-Si composites were tested,and the wear mechanism was described.The results reveal that compared with that of the Al-Si matrix alloy,wear volume of the composites prepared was decreased greatly.At the amount of 3% SiC nano-particles,with increasing in the addition of SiC micro-particles,the wear volume of the composites is decreased firstly and then increased.The wear volume of the composites with（3%nm+15%μm）hybrid nano-micro SiC particles reinforced reaches minimum value,and wear resistance is improved by 58.2% compared with those of the Al-Si matrix alloy.The wear morphology of the nano-micro SiC particles reinforced composites was observed by SEM（scanning electron microscope）,and it is found that the wear mechanism is characterized mainly by abrasive wear.关键词：Micro-Nano Particles;Aluminum Matrix Composite;Wear Volume;Brittle Fracture
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发布时间：2023-12-18 - 摘要：Effects of heat treatment on microstructure and properties of SiCp/2024 composites prepared by semi-solid thixo-extruding forming were investigated by scanning electron microscopy（SEM）,X-ray diffraction（XRD）and electron probe.The experimental results show that with solid solution at 500℃for12hand aging treatment at 170℃for 16 h,tensile strength and hardness of SiCp/2024 composites reach478 MPa and 150 HV,respectively,while these reach 350 MPa and 86 HV,respectively,before heat treatment.
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发布时间：2023-12-18 - 摘要：The hot deformation behavior of as-rolled Ni-40 Ti shape memory alloy was investigated by the Gleeble-3500 thermal simulation machine at deformation temperature in range of 650 ℃ to 850 ℃ and strain rate in range of 0.01s-1 to 1.00s-1.The results show that the flow stress of Ni-40 Ti shape memory alloy is affected greatly by strain rate and deformation temperature,and the flow stress is decreased with the increase of deformation temperature and the decrease of strain rate.The hot deformation constitutive relationship is established based on the Arrhenius equation and multivariate linear regression equation,respectively.The error analysis shows that there exists large error between the value of experiment stress and calculated one by the Arrhenius equation.Therefore,the multivariate linear regression constitutive model is more appropriate for the prediction of flow stress of Ni-40 Ti shape memory alloy,whose average relative error is very small.关键词：Ni-40Ti Shape Memory Alloy;Hot Tensile Deformation;Constitutive Relationship
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发布时间：2023-12-18 - 摘要：CrCuFeMnSiAlx（x=0.75,1.0,1.5）high entropy alloys were produced by aluminothermic reaction on copper and glass substrates.The phase structure,microstructure and composition of the high entropy alloy were investigated by a combination of X-ray diffractometry,scanning electron microscopy and energy dispersive spectroscopy.The micro-hardness of HEAs also was tested.The effect of different substrates on the composition and structure and hardness of HEAs powder were analyzed.The results show that the CrCuFeMnSiAlxalloys can be prepared by aluminothermic reaction successfully.The alloys contain the primary BCC solid solution and a small amount of simple cubic structure.Compared with the alloys produced on copper substrate,the crystallinity of alloys prepared on glass is the better and the composition is more close to the equi-molar ratios.After crushing,the morphology of HEAs powder exhibits irregular polyhedron,and powder size is in range of several micrometers to several nanometers.The average particle size of HEAs powder prepared on glass substrate is the larger than that of one on copper substrate.The micro-hardness of HEAs prepared on glass substrate reaches the maximum value of 590 HV at Al1.0.关键词：High Entropy Alloy;Aluminothermic Reaction;Phase Structure;Micro-hardness
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发布时间：2023-12-18 - 摘要：Some kinds of refractory metals and its alloy were melted using vacuum levitation melting technology,such as V and V-Ta alloys,Nb and Nb-Ti alloys,Mo and Mo-Ti alloys,Ta and Ta-Ti alloys,Co-Cr-W,et al.The technology has its own advantages in the shape of raw materials not required strictly and uniform component and microstructure because of being melted fully and electromagnetic stirred fully as well as in the accuracy of alloy elements content because of the adding method being controlled,eliminating effectively the impurity elements in the vacuum melting condition.Finally,the products which have specified shape and size can be obtained through casting after melting.关键词：Refractory Metals;Electromagnetive Levitation Melting;Vacuum Melting;Cold Crucible
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发布时间：2023-12-18 - 摘要：The effects of different heat treatment temperature on microstructure of TC21 alloy after superplastic deformation were investigated by using superplastic tensile and triple heat treatment.The result shows that most ofαphase can be transformed intoβphase and transformedβstructure with annealing at above 940℃ during the first heat treatment.With the increase of the first heat treatment temperature,theβgrain boundary is grown gradually to completeness.In addition,the singleβphase equiaxial grain can be achieved by air cooling.The fine acicular secondaryαphase can be precipitated dispersedly fromβgrain during the second heat treatment.With the increase of the second anneal temperature,the amount of secondaryαphase and the size are increased.The smaller secondaryαphase can be precipitated from the gap of acicularαphase during the third heat treatment,and the secondaryαphase in the basketweave is coarsened with the increase of the temper temperature.关键词：TC21 Titanium Alloy;Temperature Parameters;Superplastic Stretching;Triple Heat Treatment
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发布时间：2023-12-18 - 摘要：Effects of processing parameters,such as different pulse voltage,pulse frequency,pouring temperature and mold temperature,on solidified structure of Mg-Y-Cu-Zr-Sr alloy with long period ordered structure were investigated under pulsed magnetic field.The results show that solidified structure of the alloy can be refined obviously by pulsed magnetic field.Primary phase of the alloy is transformed into rosette crystal with uniform distribution of second phase.When the pulse voltage is at 0240Vor pulse frequency is at 110Hz,with the increase of pulse voltage or pulse frequency,solidified structure of the alloy is refined gradually.When the pouring temperature is at 660750 ℃ or the mold temperature is at 200600 ℃,with the increase of pouring temperature or the decrease of mold temperature,microstructure of the alloy is refined gradually.关键词：Pulsed Magnetic Field;Mg-Y-Cu-Zr-Sr Alloy;Solidified Structure
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发布时间：2023-12-18 - 摘要：The main factors influencing the overhang degrees of starting sheet of traditional copper electrolysis were analyzed,and a continuous wide line of suppression on both sides of a starting to improve its trailer overhang degrees was designed.By Deform-3Dsoftware establishing plastic finite element model of variable thickness（0.8mm to 1.5mm）starting sheet,the validity of the new design of wide line was described.The overhang degrees reaches±5mm,meeting the enterprise requirement.The experimental prototype was designed,and 26 groups of starting sheet were selected randomly to test.The results exhibit 70% of the overhang of starting sheet to±5mm,which is well agreement with the simulated ones,meeting the requirement.关键词：Copper Electrolysis Traditional Method;Starting Sheet Overhang Degrees;Deform-3D
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发布时间：2023-12-18
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