最新刊期
卷 36 ， 期 3 ， 2016
- 摘要：Microstructural evolution and mechanical properties of AZ31 magnesium alloy welding joint with Mn particle addition by resistance spot welding were investigated by using optical microscopy,scanning electron microscopy（SEM）and energy dispersive spectrometer（EDS）.The results show that with the increase of Mn addition,equiaxed dendrites are increased gradually in nuclear area of spot welding fusion,and grain in the heat affected zone is refined.More heterogeneous nucleation is generated with the addition of Mn particles during solidification process,so that the microhardness and tensile shear force are also improved.The maximum tensile shear force of resistance spot welding joint of magnesium alloys is 2.1kN with 1.0mg Mn particles addition,increased by 23.5% compared with that of one without Mn addition.When adding 4.0mg Mn,equiaxed dendrites disappear in nuclear zone of spot welding fusion,and a large number of cellular dendrites appear,resulting in the decrease of mechanical properties of the welding joint.关键词：Magnesium Alloy;Resistance Spot Welding;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The energy efficiency model of scrap aluminum regeneration during alloying process was established.The effects of processing parameters in condition of adjusting different kinds of alloying elements on alloying energy efficiency were analyzed.Combined with the gas consumption model,the minimum amount of gas volume supplied was presented in different alloying process.The results show that when the same content of an element is adjusted,the higher alloying energy efficiency is realized in feeding than that in dilution,and the higher the content of target alloying element in master alloys used in feeding is,the higher alloying energy efficiency is.The highest alloying energy efficiency can be observed with adding Si than any other elements.By optimizing way of gas supplied,when alloying process is completed,melt temperature just reaches the required temperature,where the highest alloying energy efficiency can be realized.关键词：Aluminum Scrap;Alloying;Energy Efficiency;Process Parameters
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发布时间：2023-12-18 - 摘要：<正>菲亚特克莱斯勒汽车公司正将使用镁制材料作为其在汽车工业设计工具箱内的最新技巧,从而减轻整车重量、提升燃油经济性,以此应对逐步严苛的排放标准。这家具备意大利与美国双重背景的汽车制造商,将在自己2017款Pacifica小型货车的尾门上使用轻型金属作为钢的替代品。
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发布时间：2023-12-18 - 摘要：<正>镁合金的着火温度一般为550600℃。镁块虽然不会轻易燃烧,但粉末、切屑等细碎的金属片在遇到火源时容易燃烧。丸笑制作所投入实用的螺丝,解决了镁合金的这个难题。通过使用熊本大学河村能人开发的"KUMADAI不燃
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发布时间：2023-12-18 - 摘要：Effects of welding current,welding speed and the argon flow rate on the microstructure and mechanical properties of TIG welding joint were investigated.The results show that with welding current of 160 A,the welding speed of 4mm/s,argon flow rate of 10L/min,welded joints can possess the desirable strength and plasticity,where the tensile strength and yield strength of welded joints reach97% and 98% of the matrix material,respectively.With the increase of the welding heat input,the average grain size in the heat affected zone is increased,however,the width of the heat affected zone is narrow,which may be related with the second phase particles in the matrix material.关键词：AZ31Alloy;Welding Process;Mechanical Properties;Microstructure
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发布时间：2023-12-18 - 摘要：Microscopic phase-field model was used to simulate the early precipitation process of Ni75Al6.5V18.5alloy.By analyzing the evolution of atomic image and the atomic occupation probability,the precipitation mechanism and some non-equilibrium phenomena were systematically explored.The result show that transferable interface has a specific atomic transition mode,and the atomic transition presents to some regularity.（100）D∥（200）Land（100）D∥（200）L·1/2[001]before and after the migration,interface structure remains unchanged,and（200）D∥（100）L·1/2[100]is migrated to form（200）D∥（100）L,alternating between the two.Phase interface migration can induce phase transition L12 to DO22,and Ni atoms at the interface are stepped to the position of the nearest neighbor of Al,and V is migrated to the DO22 domain,while Al is migrated to the outside interface.Interphase interface migration comes by the atomic transition and replacement model,following the shortest path of least resistance and replace mode atomic transition,which means the transformation of L12 phase to DO22 phase mutually following the best thermodynamics and kinetics optimization path.关键词：Microscopic Phase-field;Occupation Probability;Interface Migration;Out-of-phase Interface
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发布时间：2023-12-18 - 摘要：Using AZ61 extruded performs,tensile specimens of AZ61 magnesium alloy were fabricated by close-die hot pressing with varied deformation rate.Effects of grain size and texture during close-die hotpressing process on ambient mechanical properties of the alloy specimens were analyzed by OM,EBSD.The results reveal that intense basic texture can be observed in the extruded performs,and the grain is located at hard orientation,so it is difficult to slide up,taking the high yield strength.Under the condition of the similar primary texture intensity,grain refinement can improve the yield strength and elongation of the alloy specimens,however,deformation rate is limited for improving the microstructure and properties of the alloy specimens.关键词：AZ61Magnesium Alloy;Net-shape Perform;Texture;Grain Size;Mechanical Properties
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发布时间：2023-12-18 - 摘要：<正>中国大宗商品发展研究中心（CDRC）提供的最新数据显示,2016年3月份天津国际矿业权交易所镍CCI（大宗商品信心指数）为0.13,而此前发布的2015年2月份镍的CCI为-0.11,CCI转正,反映市场人士对2016年3月份的电解镍市场走势看涨,市场信心大幅提升。从CDRC本次调研的100家样本来看,对于镍市3月
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发布时间：2023-12-18 - 摘要：<正>从妙盛动力科技锂电池项目在长沙高新区产业园开工仪式上获得的消息,该公司将建造"动力换电能源站",一改电动汽车充电慢、排队长的现状,通过"换电模式"来为电动汽车续航,里程有望达到600km,是传统电池的2倍。
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发布时间：2023-12-18 - 摘要：<正>奇瑞汽车年产6万辆铝合金骨架车身纯电动乘用车项目,在安徽省芜湖市高新技术开发区启动。该项目一期工程预计于今年9月建成投产,首款车型为一款小型纯电动SUV,该车型是基于奇瑞汽车全新超级轻量化技术平台开发。据悉,奇瑞新能源年产6万辆铝合金骨架车身纯电动乘用车项目规划占地338亩,项目总投资15.6亿元,分两期建设。一
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发布时间：2023-12-18 - 摘要：<正>为贯彻落实"主攻工业、三年翻番"工作会议精神,打造赣州稀金谷,推进稀土新材料及应用产业发展升级,赣州市国土资源局十项措施支持稀土新材料及应用产业:一、支持调整完善土地利用总体规划。对稀土新材料及应用产业项目不符合土地利用总体规划的,支持在2016年土地利用
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发布时间：2023-12-18 - 摘要：<正>近日,重庆大学国家镁合金材料工程技术研究中心与青海盐湖工业股份有限公司签订战略合作协议,将联合重庆市科学技术研究院、美国犹他大学、澳大利亚昆士兰大学,共同打造青海盐湖"中国盐湖镁产业技术协同创新平台"。为了加快落实双方战略合作协议的有关内容,2016年2月1日,青海盐湖工业股份有限公司董事长王兴富一行访问了国家
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发布时间：2023-12-18 - 摘要：<正>在中航天地激光科技有限公司的研发生产基地,核心技术是"飞机钛合金大型复杂整体构件激光成形技术",即用激光技术将钛合金逐层堆积,制造出钛合金飞机整体构件钛合金强度高、耐蚀性好、耐热性高,虽然造价昂贵,却是制造飞机主风挡整体窗框等整体构件的优质材料。不过,传统制造方法是锻造和机械加工,不断给材料做"减
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发布时间：2023-12-18 - 摘要：<正>日前,全球首条"千吨级高纯氯化锂"生产线在青海柴达木盆地西台吉乃尔盐湖建成。该生产线以盐湖卤水为原料,提取锂、硼等元素。"千吨级高纯氯化锂"生产线是中科院重点项目"盐湖卤水若干战略性元素提取"的子课题之一,这项工程由中科院青海盐湖所和中科院上海有机化学所共同承担,拥有独
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发布时间：2023-12-18 - 摘要：<正>近日,中国科学院大连化学物理研究所储能技术研究部研究员张华民、李先锋领导的研究团队在锌溴液流电池电极材料研究方面取得新进展。锌溴液流电池具有高理论能量密度、电解液成本低的优势,在大规模储能领域具有较好的应用前景。但其Br2/
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发布时间：2023-12-18 - 摘要：Riser design is an important part of casting process design.In order to save metal materials and reduce production cost,the design principles of riser process were further analyzed.According to the feeding principles and production experience,the riser optimization model was established and transformed into an actual problem model.The riser actual problem model was optimized by using fruit fly optimization algorithm.On the precondition of process requirement,the optimization result shows that the riser volume is reduces by 12.635% compared with calculated by the modulus algorithm,exhibiting a satisfied effects.Compared with the simulated results by HZCAE,the result verifies the feasibility of fruit fly optimization algorithm.关键词：Fruit Fly Optimization Algorithm;Riser Process Design;Riser Optimization;Modulus Algo rithm
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发布时间：2023-12-18 - 摘要：In traditional design,the deformation of the inner shell of the refrigerator box body was not controlled accurately,resulting in modification of the subsequent foam mould design repeatedly.Taking inner shell of a type of refrigerator reefer case as an example,the deformations of inner shell of a reefer case was simulated and analyzed by the ANSYS software.Based on deformation analysis,the design sizes of foam mould were compensated.Practical production reveals that numerical simulation can realize the optimization of the foam mould for the box body,which can provide a reference for the production of similar parts.关键词：Inner Shell of a Reefer Case;Numerical Simulation;Foam Mould;Optimization
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发布时间：2023-12-18 -
- 摘要：The semi-solid slurry of ZA27 casting alloy was prepared by self-inoculation method.Waterquenched microstructure of ZA27semi-solid slurry at different treatment temperature,isothermal holding temperature and holding time was observed.The results indicate that the self-inoculation method with two inoculation stages can refine effectively ZA27 melt to achieve fine rosette equaixed grain.During isothermal holding process,average grain size of the ZA27 alloy slurry is increased with isothermal holding time increase,while grain shape factor is increased firstly and then decreased.With isothermal holding temperature of 470℃and isothermal holding time of 3min,the corresponding average grain size is 60.02μm.关键词：Self-inoculation Method;Water-quenched Microstructure;Nucleation;Isothermal Holding
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发布时间：2023-12-18 - 摘要：It was described for the three main factors:equipment,mold,alloy and squeeze casting three series parameters:process parameters,die parameters,equipment parameters as well as squeeze casting technology of two control difficulties:how to realize the smooth filling of liquid flow and how to realize the smooth transfer of the pressure（sequence）of various factors.Meanwhile,influence of various factors on quality of squeezing casting parts and inter-effects in various factors were expounded.The comprehensive control of the quality of the squeeze casting parts was presented.Based on condition change during production process and inter-effects of different parameters,rational parameter control and adjustment is the key point for producing qualified squeezing casting parts.In addition,the comprehensive control of quality of squeezing casting parts is the base of obtaining high efficiency.关键词：Squeeze Casting;Quality;Mould;Comprehensive Control
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发布时间：2023-12-18 - 摘要：The development state of die casting zinc alloy was introduced.Basic types and property characteristics of die Zn alloy were expounded.It is point out for role of different element.Effects of RE modification treatment on microstructure and properties of the die casting Zn alloy were analyzed.The problems in production of die casting Zn alloy and its future were presented.关键词：Die Casting Zinc Alloys;Rare-Earth Modification Solution;Manufacturing Technology
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发布时间：2023-12-18 - 摘要：According to the forming characteristics of the pressure-casting,by the analysis of casting process for the material,structure and size of the thin-walled zinc alloy part,3D modeling and die casting die were designed by using UG software.The structure characteristics of die casting die with double parting surface was described.The insert structures of die casting die for the thin-walled part and the push pin layout of pushing mechanis were analyzed.Processed die after assembly and adjustment exhibits steady working state.关键词：Thin-walled Part;Die-casting Die;Insert Structure;Tile Push Pin;Center Gate
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发布时间：2023-12-18 - 摘要：A complicated thin-walled cone housing was produced with ZL205 Aalloy.Combining with the solidification characteristics and structure formability analysis of ZL205 Aalloy,a bottom pouring gravity filling method was designed for investment casting cone housings,and the distribution of solidification,temperature and solid phase precipitation was calculated by the finite element simulation.The results show that the total gravity filling time is 21 s,and the complete solidification and solid phase precipitation time reach 374 sand 424s,respectively,by designing the bottom gravity filling for investment casting ZL205 Aalloy housings,meanwhile,the directional solidification from bottom to top and from inside to outside can be realized.The average grain size in the alloy housings at as-cast and T5 heat treatment reach 112μm and 94μm,respectively.The mechanical properties of test sample at T5 heat treatment state that cut out from the rib region were tested,where average tensile strength,yield strength,elongation and brinell hardness reach 453 MPa,400 MPa,8.9% and 114 HBS,respectively,meeting the design specification.关键词：ZL205AAlloy;Gravity Filling;Numerical Simulation;Investment Casting
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发布时间：2023-12-18 - 摘要：The centrifugal casting process for 42CrMo bearing ring was simulated,and the main casting process parameters were designed.And then,the experiment was carried out by centrifugal casting method,and the microstructure and mechanical properties of cast blank were analyzed.The results show that the numerical simulation results are accordant with the experimental ones.The ring casting blank prepared by centrifugal casting exhibits excellent mechanical properties.
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发布时间：2023-12-18 - 摘要：Al-based matrix composites（AMCs）reinforced with AlCoCrFeNiTi0.5high-entropy alloy particles（HEAp）of 10%,20%,30%in volume fraction,respectively,were consolidated by spark plasma sintering.Influences of HEAp content on room-temperature compressive and tensile properties as well as microstructures were identified.The AMCs reinforced with HEAp less than 20% exhibit win-win of strength and ductility.With HEAp of 20%,the tensile strength and elongation,compressive strength of the composites are increased by 90.1% and 52%,76.2%,compared with those of the composites with absence of HEAp,and still keep the plastic compression characteristics,which are attributed to the better interfacial compatibility between the Al matrix and HEAp.Excess addition of HEAp up to 30%is detrimental to the composites because of overabundance interphase leading to the matrix damage.关键词：Spark Plasma Sintering;AlCoCrFeNiTi0.5;AMCs;Interphase
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发布时间：2023-12-18 - 摘要：2.5D-Cf/Al composites with 2.5Dgraphite fiber as reinforcement and ZL301 as matrix alloy were fabricated by the vacuum pressure infiltration method.The effects of fiber preheating temperature on the relative density and tensile strength of 2.5D-Cf/Al composites were investigated.The results show that the distribution of M40 fiber reunited in the matrix tends to be more uniform,while the relative density is increased firstly and then decreased,the tensile strength of the composites is decreased with the increase of fiber preheating temperature.The high interface strength induced by excessive interfacial reaction at high fiber preheating temperature may damage the fiber strength as well as leading to brittle fracture during the tensile loading process.关键词：2.5D-Cf/Al Composite;Vacuum Pressure Infiltration;Fiber Preheating Temperature;Density
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发布时间：2023-12-18 - 摘要：AZ91alloy composites reinforced with Graphene nanosheets（GNS）were fabricated by powder metallurgy combining with hot extrusion technology.The mechanical properties of the composites were tested,and the fracture morphology of the composites was observed and analyzed by scanning electron microscope equipped with energy-dispersive spectrometer（EDS）.The results reveal that the yield strength,elongation and microhardness of the AZ91-0.1%GNS composites reach 191 MPa,6.7% and60.4 HV,increased by 19.4%,11.7% and 13.5%,respectively,compared with those of AZ91 alloy matrix.The strength and microhardness of AZ91 composites with 0.1%GNS are closed to those of AZ91 alloy with 1.0% CNTs except for the ductility.There exist three kinds of distribution states of GNS in the matrix after hot extrusion,such as parallel to the tensile direction,cross the tensile direction with an angle and perpendicular to the tensile direction.However,the distribution state of GNS to the tensile direction exhibits the lowest contribution in strengthening the composites among three kinds of distribution,which limits significantly the improvement in the strength and elongation of the composites.关键词：AZ91Alloy;Graphene Nanosheets;Composites;Mechanical Properties
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发布时间：2023-12-18 - 摘要：SiCpwas modified by high temperature oxidation,NaOH solution corrosion and K2ZrF6 solution coating to understand effects of modification of SiCp on the wear-resistance of aluminium-siliconbased composites,and the wear-resistance of aluminium-silicon-based composite reinforced by modified SiCp was investigated.The phase,surface morphology,hardness and wear resistance of the composites were tested by X-ray diffractometer（XRD）,scanning electron microscope（SEM）,Brinell hardness tester and ML-10 type wear testing machine,respectively.The results show that the thickness of SiO2 at the surface of SiCpis increased with increasing in oxidation time,and the surface of SiCpbecome coarse after corrosion by NaOH solution,meanwhile,a coating exists on the surface of SiCpafter treated by K2ZrF6 solution.In addition,the density,hardness and wear resistance of the samples are increased firstly and then decreased with oxidation time increase.Compared with sample reinforced by unoxidized SiCp,the wear rate is decreased by 40%for sample reinforced by SiCpoxidized at 1 100 ℃for 10 h.关键词：SiC Particle;Modification;Composites;Wear-Resistance;Powder Metallurgy
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发布时间：2023-12-18 - 摘要：Porous titanium was prepared by powder metallurgy with NH4HCO3 as space holder at 10-3 Pa and its mechanical properties can match with bone.The microstructures,phase constituent and porosity of the porous titanium were investigated by SEM,XRD and Archimedes’ testing,and the mechanical properties of the porous Ti were tested by electronic universal material test machine.The results reveal that with the change of space holder addition,the main phase of the porous titanium remainsα-Ti phase,and its porosity is in range of 6.9%65.7%,and the higher the porosity is,the greater the average pore diameter is.Meanwhile,with the increase of the porosity,the compressive strength of the porous Ti is in range of 50 and 1 558 MPa.With the content of space holder in range of 30% 50%,the elastic modulus of porous titanium reaches 4.1to 9.4GPa,which is very close to the bone’s elastic modulus（2.320GPa）in theory.关键词：Space Holder;Powder Metallurgy;Porous Titanium;Elastic Modulus;Compressive Strength
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发布时间：2023-12-18 - 摘要：A new electromagnetic brake technology called V-EMBr（Vertical-Electromagnetic Brake）which was applied in slab continuous casting process was put forward.The three-dimensional magnetic field and flow field model for describing the slab continuous casting process with V-EMBr were established and solved by commercial software Ansys and fluent,then the distribution of the magnetic flux density and flow velocity in mold was visualized and analyzed.The characteristics of magnetic flux density and the flow velocity variation in mold with V-EMBr were described.The calculation results reveal that the constant magnetic field generated by V-EMBr can cover the molten steel region near the mold narrow face and the height region from free surface to the impact point of the main jet,and the magnetic flux density is mainly in magnetic pole covered area,outside the magnetic pole covered area,and a decaying magnetic field distribution of magnetic flux density is observed in molten steel.After applying the V-EMBr,the impact velocity of the main jet,molten steel velocity of free surface and the impinging depth in lower recirculation zone are decreased significantly,which are beneficial to reducing slag,preventing breakout and promoting inclusions floating,and then improving the quality of the slab.Thereby,the V-EMBr shows the satisfied metallurgical effect.关键词：Electromagnetic Brake;Continuous Casting;Magnetic Field;Numerical Simulation
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发布时间：2023-12-18 - 摘要：Based on the Matlab platform,identification model was established by the output error model in system identification method to determine the model of alumina high-pressure dissolving temperature model.The results reveal that step response curve of the second-order model is fitted basically with the online temperature trace which collected by alumina high-pressure digestion acquistion at worksite,and degree of fitting reaches 86.27%.The stability of the system is verified by the algebraic stability criterion.The identification model is reasonable and effective,which can provide the model basis for parameter setting and optimizing control.At the same time,the control precision of the system is improved,and the dissolution rate of alumina is increased with the decrease of the energy consumption.关键词：Bayer Process;Alumina Production;Dissolution Temperature;Object Model
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发布时间：2023-12-18 - 摘要：Effects of pulsed magnetic field with different magnetic intensity and frequency on primary Si and eutectic Si phase in microstructure of Al-12.6Si-1Cu Alloy were investigated.At a fixed pulsed magnetic intensity,effect of pulse magnetic field frequency on primary Si and eutectic silicon in microstructure of eutectic Al-Si alloy was analyzed.The result shows that with the frequency of the pulsed magnetic field increased from 0.5Hz to 5Hz,microstructure of primary silicon and eutectic silicon in Al-12.6Si-1Cu alloy are refined obviously firstly and then coarsened.In the case of the pulsed magnetic field frequency of 2Hz,with the intensity of the pulse magnetic field increased from 5×104 A/m to 7×105 A/m,the size of primary silicon and eutectic silicon in the Al-12.6Si-1Cu alloy can be refined firstly,and then coarsened.The influence of the magnetic field intensity on the primary silicon and eutectic silicon is more than that of the frequency.关键词：Pulsed Magnetic;Magnetic Intensity;Magnetic Field Frequency;Al-Si Alloy
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发布时间：2023-12-18 - 摘要：The aluminum adhesive behavior of 6061 aluminum alloy was analyzed under the high temperature on the surface of 4Cr5MoSiV1 hot work die steel with the self-designed fixture on electron-tensile tester.The effects of the forming temperature and deformation on the aluminum adhesive were analyzed quantitatively,and aluminum adhesion microstructure was observed.The results indicate that the aluminum transfer mass is increased firstly and then decreased with the increase of the heating temperature.It is found that the least amount of aluminum transfer mass can be obtained at 450℃,and the phenomenon of aluminum adhesive becomes more and more serious with the increase of temperature.The aluminum transfer mass shows a trend of increasing slowly firstly and then increasing drastically with the increase of the deformation rate.When the deformation rate is more than 40%,the phenomenon of aluminum adhesive becomes more serious.关键词：6061Aluminum Alloy;4Cr5MoSiV1Hot Work Die Steel;Adhesive Behaviors;High Tempera ture Compression;Aluminum Transfer Mass
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发布时间：2023-12-18 - 摘要：Titanium alloy can form a variety of defects in the production process due to various reasons.Titanium alloy defects encountered in production were analyzed for some examples,and the preventing countermeasures were put forward to reduce or eliminate defects.The results show that the metallurgical defect in titanium alloy is mainly caused by the production of raw materials of titanium alloy,and metallurgical defect types are mainly composed of unqualified chemical composition,refractory intermediate alloy slag,titanium oxide clinker,regional composition segregation and so on.关键词：Raw Materials;Titanium Alloy;Metallurgical Defects
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发布时间：2023-12-18 - 摘要：Effects of Gd alloying on microstructure and corrosion resistance of as-cast AM50 alloy was investigated by optical microscope,X-ray diffraction and scanning electron microscope.The results show that the AM50 alloy is composed ofα-Mg solid solution and the primaryβ-Mg17Al12 phase,and the main phases in the Gd alloyed AM50 alloy areα-Mg,β-Mg17Al12,Al2Gd3 and Al0.4GdMn1.6.The addition of Gd element can play a role in fine grain strengthening,purification and dispersion strengthening.The corrosion resistance of Gd alloyed AM50 alloy is superior to those of AM50 alloy,and the AM50-2Gd alloy has the desirable corrosion resistance.关键词：Automobile Engine;AM50Alloy;Gd;Microstructure;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：Effects of Sm content on the microstructure and mechanical properties of gravity casting and die casting ADC12 alloy were investigated by metallographic analysis,liquidity and tensile testing.The results show that with the increase of Sm content,microstructure is refined firstly and then coarsened,and alloy liquidity is increased at first and then decreased.Compared with those of ADC12 alloy without Sm,Si phase can be refined with more spheroidization,and the fluidity of the alloy with 1.0% Sm addition is improved by 17.8%.In the die casting,compared with the ADC12 alloy,microstructure of 1.0%Sm alloy can be ignored in change,however,liquidity,tensile strength,yield strength and elongation are increased by 1.5%,8.1%,6.9% and 13.0%,respectively.关键词：Sm;ADC12 Alloy;Microstructure and Properties
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发布时间：2023-12-18 - 摘要：Effects of different DC magnetic field intensity（01.4T）on solidified structure and mechanical properties of AZ91 D magnesium alloy were investigated.The results show that with the increase of magnetic field intensity,primary phase and second phase in the alloy are refined firstly and then coarsened as a result of MHD and TEMHD effects,and the turning point is 0.84 T.Due to the different susceptibility of different crystal plane,the diffraction intensity of crystal plane（101）ofα-Mg matrix is weakened,and the crystal plane（102）,（100）and（110）are enhanced significantly with the increase of magnetic field intensity.Mechanical properties of the alloy are improved obviously with DC magnetic field treatment.With the magnetic field intensity of 1.4T,tensile strength and elongation of the alloy are increased by 86% and by 28%,respectively,compared with those of the alloy without DC magnetic field treatment.关键词：DC Magnetic Field;AZ91D Magnesium Alloy;Solidified Structure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The strength of Al-Li alloy was improved with increasing solubility of Cu in 2A97Al-Li alloy by the near-rapid solidification technology.The mechanical properties of Al-Li alloys with different Cu contents were analyzed by tensile testing.The microstructure of Al-Li alloys with varied Cu content was observed by optical microscopy（OM）,scanning electron microscopy（SEM）,electron diffraction and energy spectrum（EDS）.The results reveal that the tensile strength of the alloy is increased firstly and then decreased with increasing in Cu content.The fracture mode of the alloy is characterized by brittle fracture.And the distribution and proportion of strengthening phase includedθ′,S′andσin alloy can be changed,resulting in the reduction homogenization treatment effect.When the Cu content is 3.51% or4.52%,the homogenization treatment exhibits desirable.However,when the Cu content reaches7.51%,eutectic segregation occurs,and then the effect of homogenization is not obvious.There exists some bulky phases,leading to a decrease of the tensile strength of the alloy.关键词：Near-rapid Solidification;Brittle Fracture;Strengthening Phase;Eutectic Segregation
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发布时间：2023-12-18 - 摘要：The as-cast grain morphology of the alloy was changed with adding the trace scandium and zirconium compound into the hypereutectic Al-4Fe alloy.The grain in the aluminum matrix is refined effectively as a result of the modification agent providing high quality heterogeneous nucleation core in the process of alloy solidification.The diffusion of the Fe atoms is inhibited partly in the frontiers of the crystallization because of the enrichment of Sc and Zr around the primary Al3 Fe phases which plays the role in inhibiting and refining the growth of primary Al3 Fe phase.With 0.3% Sc and 0.2% Zr compound addition in the Al-4Fe alloy,the desirable refining effects can be observed,and the primary Al3 Fe phase is changed from the shape of coarse needles to be fine needle-like,particle-like and flower-like,so the tensile strength of the alloy is also improved.In addition,the refining mechanism of minor Sc and Zr compound modifying the hypereutectic Al-4Fe alloy was expound.关键词：Scandium;Zirconium;Modification Agent;Al3Fe Phase;Refining Effect
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发布时间：2023-12-18 - 摘要：<正>2016年3月294月1日,华南地区机械行业盛会——第17届深圳国际机械展览会在深圳会展中心举行,本届展会首次增设压铸展并在3号馆设独立展区,力劲科技集团、仁兴集团等多家压铸装备参加展览。而为配合此次压铸专题展,主办单位举办首届压铸应用技术论坛,与展会形成交相辉映和相互提升。
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发布时间：2023-12-18 - 摘要：The Ni-based alloy pump body has complex structure with apparent change of wall-thickness,which takes the great difficulty in design of the casting processing.Aiming at the formation of shrinkage porosity in the Ni-based alloy pump body,the ProCAST software was used to predict the filling and solidification of the pump body,then the casting process was modified to eliminate shrinkage defect.Finally,the qualified Ni-based pump body was prepared successfully.关键词：Pump;ProCAST;Casting Process Simulation;Shrinkage Porosity
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发布时间：2023-12-18 - 摘要：Cu-Cr-Zr-Ni-Si alloy was prepared with Cu-Cr-Zr alloy as the matrix by adding Ni and Si element.Effects of solid solution and aging process on the conductivity and microhardness of the alloy prepared were analyzed.The results show that with the increase of solution temperature,the hardness of Cu-0.6Cr-0.15Zr-2.8Ni-0.9Si alloy is declined rapidly to 95 HV,and the conductivity is decreased slightly in range of 9.2810.44MS/m.The conductivity and hardness of the alloy are improved greatly after aging treatment.After solution at 980 ℃for 2hand aging at 550 ℃for 1h,the conductivity can be increased to 20.30 MS/m,and the hardness can reach 273 HV.关键词：Cu-Ni-Si-Cr-Zr Alloy;Hardness;Conductivity
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发布时间：2023-12-18
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