最新刊期
卷 39 ， 期 5 ， 2019
- 摘要：A coating reinforced with in situ synthesis of Ti3SiC2 particulates was fabricated successfully on the Ti-6 Al-4 Valloy by the low oxygen partial pressure fusing technique in the Al-Si-TiC powders system.The results show that the role of aluminum is served as a diluent agent to decrease the molar fraction of reactant in the slurry and as a activator agent to accelerates the coating formation,as a assistant agent to decrease the reactive temperature for the formation of Ti3SiC2,as deoxidant agent to remove the oxygen in the system,as stuffing agent to favor the densification of coating during the fabrication of Ti3SiC2,which provide an easier route for fabrication of the Ti3SiC2.关键词：Ti-6Al-4V Alloy;In Situ Synthesis;Ti3SiC2 Particulate
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发布时间：2023-12-18 - 摘要：Influence of surface defects on the fatigue crack path,propagating rate and plastic strain under constant ΔK was investigated.The fatigue crack paths,appearance and plastic region were characterized by 3D X-ray tomography,SEM and grid method.The results reveal that the fatigue crack can be deflected towards the surface defects.The fatigue crack rate is increased obviously near the defects,and the plastic deformation is relatively bigger at the intersection location of surface cracks and fatigue cracks.关键词：ZTC4 Titanium Alloy;Cast Defects;Fatigue Cracks;Plastic Strain
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发布时间：2023-12-18 - 摘要：<正>安徽证监局网站消息,今年初,埃夫特智能装备股份有限公司（下称埃夫特）与国信证券签订了IPO（首次公开发行股票）辅导协议。埃夫特正式启动了登陆国内资本市场的计划。埃夫特成立于2007年,从事工业机器人、智能机器人、智能生产线设备等研发、设计、制造。从2014年先后并购了4家意大利工业机器人上下游企业。目前,埃夫特的工业机器人及智能装备年产能为1万台套,并在建设下一代智能工业机器人研发及产业化项目。该项目总投资为1.2
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发布时间：2023-12-18 - 摘要：<正>龙蟒佰利股份2019年4月8日公告,公司旗下两家子公司拟分别投资19.8亿元、15.1亿元新建年产3万吨高端钛合金新材料项目和50万吨攀西钛精矿升级转化氯化钛渣创新工程项目,建设周期均为2年。具体是,年产3万吨高端钛合金新材料项目由公司旗下的新材料公司负责投资建设,项目将充分利用公司现有的大型富钛料生产装置、大型沸腾氯化法四氯化钛生产装置和多年的钛行业生产经验,采用先进技术建设低成本海绵钛生产装置,发展高端钛合金材料,打造更加完整的先进
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发布时间：2023-12-18 - 摘要：<正>2019年4月19日,拥有机器人行业"诺贝尔奖"美誉的"恰佩克奖"在安徽芜湖揭晓,伊之密机器人自动化科技（苏州）有限公司获得"最佳行业应用奖"（压铸）殊荣。恰佩克奖（THE CAPEK PRIZE）是由中国机器人网设立,以"robot"一词创造者-捷克科幻小说家卡雷尔·恰佩克（Karel Capek）的名字命名的奖项,旨在做机器人行业发展的见证者和推动者,并奖励为机器人领域做出突出贡献的组织或个人,目前在行业内恰佩克奖被认为是机器人领域最重要的奖项之一。伊之密机器人自动化事业部自成立以来,以技术为核
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发布时间：2023-12-18 - 摘要：<正>宜兴日报报道,2019年无锡市重点项目,江苏文灿压铸有限公司投资的新能源汽车轻量化结构件项目,位于宜兴经济技术开发区,总投资10亿元,在原有占地186亩基础上,拟新增用地35亩,新增建筑面积2万平方米。项目购置设备250余台套,其中进口全自动生产线11条、加工中心80余台套。生产高强度铝合金车体结构件模具和压铸件。目前,项目已经完成备案,环评已通过,已办理项目一期的规划许可证,计划6月底完成低压厂房改造
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发布时间：2023-12-18 - 摘要：<正>2019年4月18日,采埃孚商用车变速箱发布暨采埃孚与福田合资工厂投产下线仪式,在嘉兴经济技术开发区举行。据悉,福田采埃孚自动变速箱项目,由福田汽车集团与德国采埃孚股份公司共同合作,成立福田采埃孚轻型自动变速箱（嘉兴）有限公司、采埃孚福田自动变速箱（嘉兴）有限公司两家合资公司。项目总投资50亿元,建设用地380亩,主要生产自动变速器。其中,采埃孚福田公司于2019年4月开始运营,在中国量产传胜（TraXon）自动变速箱。
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发布时间：2023-12-18 - 摘要：<正>SMM数据显示,2018年6月起,国内电解铝产量开始出现下滑,2019年2月已接近3 500万t。根据百川资讯统计,2018年年初至2019年2月间,全国关停的电解铝运行产能已接近318万t,供需关系逐步趋衡。据兴业证券的统计数据,2019年,国内可投产的产能为163万t左右。其中,大部分产能预计在2019年下半年投产,真正能够对当前产量形成影响的产能较为有限;对于复产产能而言,由于有相当比例产能系因置换指标而减产、
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发布时间：2023-12-18 - 摘要：<正>北京航空航天大学大型金属构件增材制造国家工程实验室在中国工程院院士王华明团队率领下,经20余年的不懈研究,在国际上率先为我国航空发动机技术赶超发达国家作出新的贡献。近日,已成功研制具有原创核心技术、世界最大的激光增材制造设备（最大成形尺寸达7m×4m×3.5m）,以及世界最大的16m2 3D打印（某大型轰炸机）某发动机钛合金加强框。在2016年1月18日,王华明院士主持的"飞机钛合金大型复杂整体构件激光成形技术"项目获得国家技术发明一等奖。根据国内外公开资料推测,王华明院士在我国新一代重型和中型隐身战斗机用发动机关键部件:高温钛合金双性能整体叶
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发布时间：2023-12-18 - 摘要：<正>铌酸锂是一种非常重要的光学功能材料,因其电光效应而闻名,铌酸锂电光调制器能够将电子数据转换为光子信息,被广泛地应用于光通信系统,是实现电光转换的核心元件。类比于硅在微电子中的地位,铌酸锂也被称为光电子时代的"光学硅"。制造高品质、微小化的铌酸锂器件进而实现高集成度的铌酸锂光电芯片,对于提高光通信系统的容量与处理速度具有十分重要的意义。能够实现纳米尺度铌酸锂微纳结构,并实现对光行为的操纵是实现相关高密度集成光电器件的关键所在。但由于铌酸锂的硬度高、
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发布时间：2023-12-18 - 摘要：<正>2019年4月10日,湖南娄底市举行2019年第一批重点产业项目集中开工,由湖南文昌新材科技股份有限公司建设的文昌科技轨道交通制动盘生产线项目,投资23 529.08万元,依托于北京有色金属研究总院的技术支撑,建设高精度砂芯成形生产线、高效环保粉体自动处理生产线、高剪切熔体处理生产线、全自动节能环保铸造生产线、制动盘后处理生产线等,形成年产30 000件轨道交通铝基复合材料制动盘生产能力。
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发布时间：2023-12-18 - 摘要：Based on the performance requirements of Fe-Cu powder metallurgy products,the Fe-0.2 Cu alloy was prepared by unidirectional pressing method with different pressing parameters including pressing force and pressing speed at the determined sintering temperature.And microstructure,densification process and mechanical properties of the Fe-0.2 Cu alloy were analyzed by means of XRD,OM,SEM.The results show that the binding degree and the spheroidization degree in particles are increased while the interface size and the porosity are decreased with the increase of pressure,and the more uniform structure in the alloy can be observed.The maximum density,tensile strength and microhardness value of the prepared alloy reach up to 6.9 g/cm3,605 MPa at 1 140℃ and 230 HV,respectively,with the pressing pressure of 600 MPa and pressing speed of 5.0 m/s.Iron matrix exists widely in form of single element.Fe atoms and Cu atoms are diffused to form phase such as Fe4Cu3,Cu9.9Fe0.1,which are located at cracks or surface and some of which oxidized to generate Fe3O4、FeO and CuO.The tensile fracture morphology shows that the pore shape of fracture is changed from coarse and irregular to small and regular sphere,which present the mixed characteristics of dimple,cleavage surface,tearing ridge and cleavage fluvial pattern.The fracture mode is changed from brittle fracture features to brittle-ductile with the increased force.关键词：Fe-Cu Alloy;Pressing Force;Fracture Mode
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发布时间：2023-12-18 - 摘要：Two alloys of Zr-1 Nb-0.1 Fe and Zr-1 Nb-0.1 Fe-0.05 V（mass fraction,%）alloy were prepared by vacuum consumable arc furnace smelting method.The microstructure,second phase particles and phase composition of oxide film formed after long-time corroding at 360℃and 18.6 MPa in Li+B aqueous solution were analyzed by OM,SEM and XRD,and effects of the addition of V on microstructure and corrosion resistance of the Zr-1 Nb-0.1 Fe alloy were investigated.The results show that the addition of V in Zr-1 Nb-0.1 Fe can refine the grain size and form the tiny and dispersedly distributed second phase particle as well as changing the phase structure of oxide film,stabling the tetragonal phase in oxide film and improve corrosion resistance of zirconium alloy in aqueous solution with Li+B at 360℃、18.6 MPa.关键词：Zirconium Alloy;Second Phase Particle;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：The new 7 K01 aluminium alloy was treated by solid solution and aging at different temperatures.The microstructures,micro-hardness and electrical conductivity of the new 7 K01 aluminium alloy during different solid solution and aging treatments were analyzed.The optimized solid solution and aging treatments for 7 K01 aluminium alloy were explored.The results show that the optimized solution temperature range of 7 K01 aluminium alloy is 470～480℃.The second phase is dissolved sufficiently at the temperature range,where the hardness and the electrical conductivity reach 24.7 HRC and 15.85 MS/m,respectively.With aging at 150 ℃ for 24 h,the hardness and the electrical conductivity of 7 K01 aluminium alloy rach 49.95 HRC and 36.1 MS/m,respecively.关键词：7K01Aluminum Alloy;Solid Solution Treatment;Ageing Treatment;Microstructure;Micro-Hardness
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发布时间：2023-12-18 - 摘要：Aiming at the problem of low utilization rate and large forming load for the hot precision forging of the copper synchronizer ring,the hot precision forging process was analyzed by the finite element software FORGE.Based on the metal plastic forming theory,the metal flow law was analyzed during synchronizer ring forming.Four factors and four levels orthogonal experiment was performed to obtain the data of maximum forming load and radial dimension of inner and outer flash with billet temperature,friction factor,inner diameter and height of billet as design variables.The grey system theory was adopted in the parameters optimization of hot precision forging of synchronizer ring,and the optimized combination of process parameters were presented for the production.The results reveal that the synchronizer ring is filled with fullness and absence of folding defect and crack.Meanwhile,the material utilization rate is improved from 44.67% to 63.73%.The feasibility of the forming process and the grey system theory was verified sucessfully.关键词：Synchronizer Ring;Hot Precision Forging;Grey System Theory;Multi-objective Optimization
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发布时间：2023-12-18 - 摘要：The new type rare earth alloy Mg-Ga-Hg-Ce-Y for automotive battery was prepared by casting method,and the corrosion resistance,charge-discharge performance and microstructure of the alloy were analyzed comparatively.The results show that the corrosion weightlessness of the rare earth alloy with Ce and Y is reduced by 25%and 9%,respectively,compared with that of the alloy without Ce and Y and containing only Ce,and the discharge capacity retention rate is increased by 5.4%and 1.7%,respectively,presenting the better corrosion resistance and charge-discharge performance.关键词：Automotive Battery;Mg-Ga-Hg-Ce-Y Alloy;Corrosion Resistance;Charge-discharge Performance
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发布时间：2023-12-18 - 摘要：By controlling the content of Ga and In in Al-Zn-Mg-Cu aluminum alloy,the effects of Ga and In on the degradation rate of the alloy were investigated.The constitutive equation of the degradation process was established.The mechanism of degradation reaction of the aluminum alloy was described by microstructure observation.The results reveal that the degradation rate of Al-Zn-Mg-Cu aluminum alloy can be controlled by adjusting the contents of Ga and In.When the content of Ga,In is increased from 2.01%、0.20% to 2.44%、0.52%,the degradation rate of the aluminum alloy is increased obviously from 0.049 8 mg/（mm2·h）to 3.402 0 mg/（mm2·h）,which are attributed to the occurrence of corrosion around the second phase containing Ga and In,then spreading to the substrate,and then the corrosion production cracked and easily falled off,promoting continuous reaction of aluminum and water.关键词：Ga Content;In Content;Al-Zn-Mg-Cu Aluminum Alloy;Degradation Rate
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发布时间：2023-12-18 - 摘要：A method to the design and prediction for materials and production process by using deep learning was described.The operating principle and characteristics of convolutional neural network,CNN for short were introduced briefly.Modeling method of a CNN network available to microstructural prediction was expounded,and applicable activation function was determined.Meanwhile,a loss function was established.Taking the cooling process of rolled steel plate as an example,the simulated temperature fields obtained by FEM were used as samples to train the established CNN.The trained CNN can give reliable predictions for the cooling plate.The results show that the fewer input and more output parameters can also be treated with CNN.A relatively small amount of samples was sufficient to the training of the CNN,which reached a better prediction.It is deduced that new alloys and processing parameters can be intelligible designed by using some basic CNN models trained for basic processing units.关键词：Deep Learning;Convolutional Neural Network;Temperature Field;Alloy Design
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发布时间：2023-12-18 - 摘要：Bulk metallic glasses（BMGs）have the advantages of high strength,high hardness and superplasticity in supercooled liquid region（SLR）,however problems of small size and simple shape have limited its application scope.Friction stir welding（FSW）with fewer heat input could be used to connect BMGs in SLR without crystallization.Fundamental principles of FSW were introduced,and present research status about FSW of BMGs at home and abroad was reviewed.In addition,existing problems were pointed out and the developing tendency was suggested.关键词：Bulk Metallic Glasses;Friction Stir Welding;Status;Developing Tendency
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发布时间：2023-12-18 - 摘要：The selective laser melting technology was used to form 150μm layer thickness 316 Lstainless steel to explore high-density forming processes by comparing different laser power,energy density,exposure time,point distance and hatch space.The results reveal that the formation quality of large layer thickness specimens at high power presents more desirable,and the optimized laser energy density range for large layer thickness formation is 50～70 J/mm3.By comparing the small layer thickness and the large layer thickness forming process,it is concluded that although the large layer thickness forming has some defects in the forming process,and most of the defects can be suppressed by adjusting the process parameters.The microstructure of large layer thickness 316 L stainless steel is mainly composed of equiaxed crystals and a small amount of columnar crystals.The mechanical properties of the specimens reach the standard values of specification for steel forgings.关键词：Selective Laser Melting;316 Stainless Steel;Large Layer Thickness;Forming Quality;Relative Density
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发布时间：2023-12-18 - 摘要：Injection tool steels AISI 420 and S136 samples were fabricated by selective laser melting（SLM）technique.The phase composition,microstructure,microhardness,tensile strength and wear resistance of two tool steels were investigated systematically.The results show that SLM-processed AISI 420 samples have a higher solid solubility of the alloying elements.Due to the solid solution strengthening of the alloying elements,the AISI420 samples present the higher tensile strength and elongation than that of S136 samples.Tensile strength and elongation of the SLM-processed AISI 420 and S136 reach 1 234.13 MPa,14.63% and 642.89 MPa,9.76%,respectively.Due to the higher C content in S136,the martensitic transformation is more easily generated in the S136 samples under the laser-induced large solidification rate as compared to AISI 420 samples.The higher hardness and lower wear rate ware obtained for the SLM-processed S136 samples.Microhardness and wear rate of the SLM-processed S136 and AISI 420 samples reach 589 HV3,3.28×10-6 mm3·N-1·m-1 and 493.78 HV3,4.12×10-6 mm3·N-1·m-1,respectively.关键词：Selective Laser Melting;Injection Mould Steel;AISI 420;S136;Microstructures and Properties
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发布时间：2023-12-18 - 摘要：6061-based metal matrix composites reinforced by 10% SiC particles with size of 20μm,20μm+50μm and 50μm were fabricated,respectively,by stirring casting and direct squeeze casting process under 100 MPa.The effects of particle size on microstructures and mechanical properties of the composites were investigated.The results reveal that with the increases of particle size,the porosity in the composites prepared is decreased gradually with more uniform distribution,and tensile strength,yield strength,elongation and hardness of the 10SiCp/6061 composites are decreased,meanwhile,the fracture mechanism of the composites prepared is transformed from ductile fracture to ductile-brittle mixed fracture.关键词：Metal Matrix Composites;Particle Size;Squeeze Casting;Microstructures;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Based on an aluminum cylinder cover,through analysis of process parameters related to solidification feeding when porosity defects appear in product,it is found that chamber quality has a serious effect on the product quality.The results reveal that the pressure transfer process through plunger can be weakened if the chamber inner cavity is stuck with aluminum and result in the increase of surface roughness of chamber inner surface,therefore hotspots area of product is difficult to be fed by gating system,and the shrinkage porosity will appear.In addition,real-time monitoring system of automatic production equipment is helpful to feedback abnormal operation of equipment,however it’s not possible to accurately feedback the influence of resistance change of the punch on the oil pressure during injection and pressure holding process,therefore systematic management of chamber quality is very important to quality control.
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发布时间：2023-12-18 - 摘要：In recent years,in the production of die casting for some important parts,vacuum die casting is often used to exhaust the air in the mould cavity.However,the inertial impact force of liquid aluminium results in the valve core to fail,affecting the vacuum degree and leading to a un-satisfied vacuum effect.For the exhaust system of a die casting,Anycasting software was used to simulate the exhausting behavior in the mould.The results reveal that when molten aluminum reaches the vacuum valve,the very high speed is close to 68 m/s.The problem of vacuum valve blockage and fracture was solved by adding a deceleration structure to the front of the vacuum valve before molten aluminum reached the vacuum valve.关键词：Exhaust System;Vacuum Die-Casting;Simulation;High Velocity;Exhaust Duct Deceleration
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发布时间：2023-12-18 - 摘要：The effects of alternating magnetic field-solidification pressure on the grain size of ZL205 Aalloy were investigated by observing the grain size in ZL205 Aalloy under the interaction field of alternating magnetic field and solidification pressure.The results reveal that the average grain size of ZL205 Aalloy sample is increased firstly and then decreased with the increase of excitation current intensity.With the increase of solidification pressure,when the excitation current intensity is less than 10 A,the synergistic effect of the variable magnetic field-solidification pressure can promote the grain growth in the alloy,and the average grain size will be coarsened.When the excitation current is more than 10 A,the synergistic effect of the alternating magnetic field-solidification pressure will inhibit grain growth and average grain size is refined.关键词：Alternating Magnetic Field;Current Intensity;Solidification Pressure;Grain Sizes;ZL205AAlloy
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发布时间：2023-12-18 - 摘要：The gas hole in the face for marking of an aluminum alloy cylinder block was analyzed.Based on the forming mechanism analysis of gas hole,casting parameters and smelting process of aluminum alloy die castings,a series of countermeasures were taken into accounted.First,through changing the high-speed starting point and the blowing time of release agent,the effects are unsatisfied.Then,the degassing time of the aluminum liquid is extended to reduce the hydrogen density,however,the effect presents poor.Finally,based on the previous improvement measures,the sinulation was carried out.Through optimizing gating system,gas hole in the die casting components is reduced from 2.5%to 0.12%.关键词：Cylinder Block;Gas Hole;Mold Temperature;Smelting;Goding System
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发布时间：2023-12-18 - 摘要：The casting process of Ti-55Al-3.5Cr-2.5Nb-1.5Ni-0.5 Balloy elbow pipe was simulated by finite element method,and microstructure and mechanical properties of the samples were analyzed.The results show that during filling process,the liquid metal first reaches the base to complete the filling process,and then flows into the bending pipe along the annular channel of the bending pipe,and then extends to all the channels to realize the filling process of the pipe wall.Ring shrinkage holes were formed at the end of the bend along the inner hole,and some shrinkage holes were found near the base and inner hole.Many equiaxial lamellar structures,the lumpγphase,theτ3 phase and part of curved boride can be observed in the alloy,and part of B2 phase structure is formed in the lamellar structure.The alloy has excellent tensile properties,such as 569 MPa in yield strength,612 MPa in tensile strength and 0.57%in elongation.The tensile fracture formed at room temperature has obvious brittle cleavage fracture characteristics with smooth fracture morphology.关键词：Titanium Aluminum Alloy;Pouring Process;Simulation;Performance Test
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发布时间：2023-12-18 - 摘要：Based on analysis of PS powder particle size and PS powder & blaster powder thermogravimetric,through selective laser sintering PS powder to make pattern for cylinder head,lower-temperature wax coating pattern and gating system assembly cluster as well as plaster investment casting molding-baking,ZL101 Acylinder head was produced successfully under negative pressure conditions.And then the cylinder head was treated by T6 heat treatment and measured.The results reveal that the surface roughness,the ultimate tensile strength and elongation reach 11.894μm,142 MPa and 5.5%,respectively.After T6 heat treatment,the mechanics properties of ZL101 Acylinder head are 106 HBW in hardness,218 MPa in tensile strength,1.2%in elongation,respectively.关键词：Aluminium Alloy Cylinder Head;Additive Manufacturing PS Pattern;Blaster Mold Investment Casting
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发布时间：2023-12-18 - 摘要：Aiming at the problems of misrun and coarse columnar crystal defects at the exhausting side of a K418 B turbine guide under gravity investment casting,the centrifugal casting process was designed and simulated,and actual casting verification as well as grain size observation of the guide were carried out.The results show that the centrifugal casting process can improve effectively the filling capacity of the guide and eliminate the casting defects at the exhaust side.At the same time,under the action of centrifugal force field,fine equiaxed grains are formed in the blade during the solidification process,which fundamentally inhibits the formation of coarse columnar crystal defects and improves the comprehensive mechanical properties of the guide.关键词：Nickel-based Superalloy;Turbine Guide;K418B;Filling Performance;Grain Structure
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发布时间：2023-12-18 - 摘要：Aluminum alloy robotic arm housing mold was printed by FDM（fused deposition molding）process,and the robotic arm housing sand core was printed by 3 DP（three-dimensional rapid printing molding）process.The process parameters such as dimensional accuracy,surface roughness and strength of the core were analyzed.The mold and sand core were used for the vacuum-process modeling aluminum alloy casting experiment.The results indicate that the linear shrinkage and volume shrinkage of robotic arm housing mold reach 0.301%,1.121%,respectively,and the final compressive strength of sand core for 24 his 1.424 MPa,and the linear shrinkage and volume shrinkage as well as the surface roughness of the robotic arm housings reach 0.342%,1.253%and 3.314μm,respectively,meeting the casting quality requirements.关键词：Fused Deposition Molding（FDM）;Three Dimensional Printing（3DP）;Vacuum Process Mold;Robotic Arm Housing
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发布时间：2023-12-18 - 摘要：Ni-20 Cr electrothermal alloys containing 0,0.3%,0.5%and 1% Mo were prepared by vacuum arc furnace.The effects of Mo addition on microstructures and properties of the Ni-20 Cr alloy were investigated by means of optical microscopy,electron probe,scanning electron microscopy,resistometer,tensile tester and Vickers hardness tester.The results reveal that the addition of Mo can refine effectively the grain size of Ni-20 Cr alloy and increase the resistivity of Ni-20 Cr alloy.With the increase of Mo content,the high temperature tensile strength of Ni-20 Cr alloy is increased firstly and then decreased.With Mo addition of 0.5%,the high temperature tensile strength of the alloy reaches the maximum value of 169 MPa.At the same time,the plasticity of Ni-20 Cr alloy is decreased,however,the fracture mode of Ni-20 Cr alloy is still plastic fracture.关键词：Ni-20Cr Alloy;Mechanical Properties;Microstructure;Resistivity
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发布时间：2023-12-18 - 摘要：Effects of untreated,Sr and B compound modification,pulsed magnetic field and composite treatment of pulsed magnetic field and modifier on microstructure and mechanical properties of as-cast and T6-state Al-6 Si-3 Cu-0.3 Mg alloy were investigated.Effects of pulse voltage and frequency on microstructure and mechanical properties of the alloy under compound treatment condition were also analyzed.The results show that modification treatment,pulse magnetic field treatment and compound treatment of pulsed magnetic field and modifier can all improve microstructure and mechanical properties of as-cast and T6-state alloy,however the effect of composite treatment presents more remarkable.Compared with those of the untreated alloy,the tensile strength and elongation of as-cast alloy are increased by 59%and 71%,respectively.The tensile strength and elongation of T6-state alloy are increased by 74%and 30%,respectively.In the range of 0～300 V,with the increase of pulse voltage,microstructure of as-cast and T6-state alloy is refined gradually.The tensile strength of as-cast and T6-state alloy and elongation of T6 alloy are increased gradually,while the changes of elongation of as-cast alloy can be ignored.In the range of 1～5 Hz,with the increase of pulse frequency,microstructure of as-cast and T6-state alloy is refined at first and then coarsened,and the turning point is 5 Hz.The change law of tensile strength is the same as that of the microstructure.However,when the pulse frequency is 10 Hz,the elongation of as-cast and T6-state alloy is further improved.
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发布时间：2023-12-18 - 摘要：Minor amount of rare earth elements（1% Gd and 0.5% Nd）and 1% TiC nanoparticles were added to Mg-6 Al alloys to improve mechanical properties of the alloy.The nanoparticles were uniformly dispersed in the magnesium alloys by semisolid stirring assisted with ultrasonic vibration.Solution treatment and aging treatment were subsequently carried out to further improve the mechanical properties of the composites obtained.The results reveal that after the addition of 1% TiC nanoparticles,the as-cast microstructure of the Mg-6Al-0.5Nd-1Gd alloys can be refined obviously,and the Vickers hardness is enhanced by 4.7%.The hardness of the composites obtained after solid solution at 420℃ for 8 hand aging at 200 ℃ for 4 hwas further improved by 20.9% compared with that of the as-cast ones.关键词：Magnesium Matrix Composites;TiC Nanoparticles;Semi-solid State;Microstructure;Hardness
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发布时间：2023-12-18 - 摘要：The microstructure and mechanical properties of A380 alloy fabricated by gravity casting with different V contents were investigated.The results show that with V addition,irregular block-like AlSiVFe phase can be observed in the alloy.With the increase of V content,the average length of AlSiVFe phase is increased from 15μm to 43μm,and the volume fraction is increased from 0.3%to 1.65%.The average length of β-Al5 FeSi phase is decreased from 47μm to 24μm.The phase constitution of the alloy is absent change after T6 treatment.The morphology of the Fe-rich phases has no obvious change after heat treatment.However,the fibrous eutectic Si phase is changed into granular particles.With the increase of V content,mechanical properties of the as-cast or heat-treated alloy are increased at first and then decreased.When the V content is 0.7%,the mechanical properties of the alloy reach the maximum value,where tensile strength,yield strength and elongation of the heat-treated alloy reach 244 MPa,226 MPa and 1.6%,respectively.关键词：A380 Aluminum Alloy;V Content;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The lap welding of the 4 mm thick 7N01P-T4 Al alloy sheet and 5 mm thick Cu sheet was performed by electric beam welding.The effects of welding speeds on interfacial microstructure and performance of lap joints were investigated.The results reveal that with the welding voltage of 65 kV,the welding current of 60 mA and the focusing current of 445 mA,obvious cracks in the joints can be observed at the speeds of 600 mm/min and800 mm/min.When the welding speed is 1 000 mm/min,the sound lap joint can be obtained.A layer of Al2Cu intermetallic compound and a very fine（α-Al+Al2Cu）eutectic structure can be generated at the Al-Cu interface in the Al-Cu joint.In the Al side of the joint,the weld zone is mainly composed of the larger（α-Al andα-Al+Al2Cu）eutectic structure.In addition,the joints load obtained at this speed reaches 2.05 kN,and it is fractured in the weld zone of Al side.关键词：Dissimilar Metals;Electron Beam Welding;Lap Joints;Crack
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发布时间：2023-12-18 - 摘要：Al-30Cu-3P master alloy was prepared by melt mixing method.The evolution of the solidification microstructure in Al-30Cu-3P master alloy and its modification effect on Al-20 Si alloy were expounded.The results indicate that the solidification microstructures in Al-30Cu-3P master alloy is composed of primaryα-Al phase,eutectic（α-Al+CuAl2）and AlP.With increasing in stirring time,the number of primaryα-Al phases in the Al-30Cu-3P master alloy is reduced gradually,while the quantity of AlP is increased gradually with coarseness of size.The AlP presents the smallest size in the Al-30Cu-3P master alloy prepared by the melt stirring time for 20 min.The size of the primary silicon in Al-20 Si alloy is refined from 61.36μm to 20.24μm with the Al-30Cu-3P master alloy modification.关键词：Al-30Cu-3P Master Alloy;AlP;Solidification Microstructure;Melt Stirring;Hypereutectic Al-Si Alloy
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发布时间：2023-12-18 - 摘要：The effects of Na modification on the morphology of Si phase and tensile properties of ZL101 alloy at low temperature were investigated.The results show that the Na modification can improve the morphology of the Si phase in the alloy.The Si phase is changed from a coarse lamellar structure to a fine fiber one,which reduces the Si splitting effect on the aluminum matrix.After Na modification,the size of Si phase is decreased.The critical shearing stress required for fracture is increased at low temperature,resulting in smaller microcracks.The mechanical properties,such as tensile strength,yield strength and elongation,of the alloy are improved at low temperature,which reach 186 MPa,161 MPa and 6.60%,respectively.关键词：ZL101Alloy;Modification;Low Temperature Tensile;Si Phase
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发布时间：2023-12-18 - 摘要：According to the characteristics of electromagnetic induction heating,the coil can be heated quickly without contacting with the material.Based on the above mentioned features,a method on how to rapidly heat the cylindrical core of aluminum alloy housings for electric vehicle was put forward to preheating temperature by electromagnetic induction coil.This method can enhance the filling fluidity of the low pressure casting aluminum alloy,and prevent defects such as shrinkage cavities in the solidification process.The heating parameters and turns of induction coil were determined by calculation,and the finite element temperature field analysis was carried out to analyze the process of the electromagnetic heating core by using ANSYS software,so as to provide accurate technological parameters for temperature control and induction heating and technical basis for selecting reasonable heating process for low pressure casting core.关键词：Core Heating;Coil Turns;Simulation Analysis;Temperature Control
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发布时间：2023-12-18 - 摘要：The effects of squeeze casting and heat treatment on microstructures and mechanical properties of the WE43 magnesium alloy were investigated.The results show that squeeze casting can refine the grain size in the alloy and the coarse Mg-Y-Nd phases,improving the properties of the alloy,where the tensile strength,yield strength and elongation reach 181 MPa,152 MPa and 7.62%,respectively.With the increase of aging time,the granular Mg24Y5 phases are dispersedly distributed along grain boundaries.The tensile strength and yield strength of the alloy reach 297 MPa and 280 MPa,respectively,at 14 h.After aging treatment for 16 h,coarse Mg-Y-Nd phase is precipitated at grain boundaries,and the properties of the alloy is decreased.关键词：WE43 Magnesium Alloy;Squeeze Casting;Heat Treatment;Microstructures;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The effects of different two-stage solid solution treatment on the structure,properties and anisotropy of 2219 aluminum alloy ring forgings were analyzed with different solid solution parameters by micorstructure observation and tensile testing.The results reveal that the anisotropy of 2219 aluminium alloy forging rings is still apparent after two-stage solution treatment.With the first-stage solution temperature increasing from 200℃ to 450℃,the strength and elongation of the alloy show two peaks,and the maximum values are obtained at 250℃ and 400℃,respectively.When the first-stage solution temperature is 400 ℃,the radial mechanical properties reach peak value,where the tensile strength,yield strength and elongation reach 402 MPa,293 MPa and 12.67%,respectively.关键词：2219 Aluminium Alloy Forging Ring;Two-stage Solution Treatment;Mechanical Properties;Anisotropy
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发布时间：2023-12-18 - 摘要：<正>2019年4月18日,2019高端媒体滨州铝业行采访团来到滨州盟威戴卡轮毂有限公司。盟威戴卡主要生产汽车轮毂,采用铸旋新工艺,同时对轮毂结构进行颠覆性创造,充分发挥低压铸造与旋压相结合的优势。业内公认的非常难生产的一款轻量化轮毂就在盟威戴卡产生,质量减轻35%、伸长率提高5%以上、强度提高10%～20%。
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发布时间：2023-12-18
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