最新刊期
卷 37 ， 期 3 ， 2017
- 摘要：In order to improve the large heat capacity and low heat transfer efficiency of continuous casting,a new mould based on thermo-analysis was designed with an inner cooling mould.The temperature field and thermal stress of copper plate and inner cooling mould were analyzed by coupled method on the basis of ensuring the copper plate work regularly.The results show that the maximum temperature and thermal stress of copper plate and inner cooling mould reach 230.8 ℃,406 ℃,261 MPa,399MPa,respectively,which takes a higher requirement for the inner cooling mould material.The calculation results and methods can provide a reference to the mold copper plate design and industry application.关键词：Mold Structure;Copper Plate;Temperature Field;Thermal Stress
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发布时间：2023-12-18 - 摘要：The true stress-true strain curves were obtained through isothermal compression experiment of low cost Ti-6Al-2.5V-1.5Fe-0.15 Oalloy.And microstructure evolution of the alloy after deformation was observed.The results show that the stress-strain curves at the single-phase regions exhibit dynamic recovery,and they demonstrate typical dynamic recrystallization at two-phase zone deformation.When the deformation occurrs at two-phase zone,the deformation microstructure is composed ofαphase and a small amount ofβphase,and the morphologies ofαphase are changed from lamellar into ball.However,with the increase of deformation temperature,the spheroidization rate is decreased and recrystallization grain is grown up.The dynamic stress softening mechanism is mainly characterized by theαphase dynamic evolution in low strain rate deformation.And fine recrystallized grains can be observed around lamellarαphase in high strain rate deformation besides of spheroidization.关键词：Low Cost Titanium Alloy;Ti-Al-V-Fe-O;Deformation Behavior;Microstructure Evolution
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发布时间：2023-12-18 - 摘要：<正>"以前,3D打印的原材料需要从加拿大购买,每公斤售价为8 000元,我们的研发成果推出后,他们主动将价格降到每公斤3 000元。"西安交通大学青岛研究院先进制造粉体研究中心主任宋晓平告诉记者。宋晓平所说的研发成果,就是作为3D打印关键原材料的高规格球形钛合金粉末。在位于青岛胶州的西安交大青岛研究院先进制造粉体研究中心,记者见到了生产高规格球形钛合金粉末的设备。这台等离子旋转电极制粉系统设备直径约为10m,呈圆盘式。
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发布时间：2023-12-18 - 摘要：<正>从陕西省镁锂合金工程研究中心获悉,该中心研制出一种新型镁锂合金材料,其密度为0.961.64g/cm3之间,是目前世界上最轻的金属结构材料。2016年12月22日,我国成功发射的首颗全球CO2监测科学实验卫星（以下简称"碳卫星"）中的高分辨率微纳卫星上,广泛采用了这种自主研制生产的超轻材料。
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发布时间：2023-12-18 - 摘要：<正>2016年下半年开始,宁夏能源铝业宁东分公司创新思维,破解铝灰处理难题,对铝灰再利用进行了总体部署。主管部门根据实际生产情况,下发了使用定额,并定期通报使用情况督促落实,确保铝灰回用工作顺利实施,各电解车间在保证安全生产平稳的前提下,有针对性地调整工艺操作,循序渐进地进行了添加试验,并逐步增加了回炉添加量,通过实施铝灰回槽使用,目前,已累计回用铝灰600余吨,节约危废处置和物料费用可观。据了解,铝灰是电解铝液生产的副产物,在铸造生产过程中通过浮渣的形式被排除出生产系统,其成分主要是氧化铝和电解质。自2015年8月铝灰被列入危险废弃物后,企业如仍执行外销的处置方式,则每吨铝灰需增加2 000元的处置成
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发布时间：2023-12-18 - 摘要：<正>我国在大飞机制造技术上与西方发达国家仍存在较大差距,重大瓶颈问题就是发动机的推力严重不足。为提高发动机推力,就需要发动机的涡轮叶片具有更高的承温能力。因此,国外大推力航空发动机全都采用单晶高温合金叶片。而在我国,由于单晶高温合金叶片制造技术的落后,大推力航空发动机只能采用定向柱晶叶片,从而导致发动机的动力、寿命与可靠性严重不足。显然,单晶高温合金叶片制造技术的突破将成为我国大飞机制造发展的关键。2007年,国内的航空航天技术也进入了新的发展阶段,国家宣布大飞机立项,迫切需要高温合金专业的研究人员。2009年6月,中国科学院金属研究所研究员周亦胄在中国科学院"百人计划"项目的支持下开始组建单晶高温合金制造技术实验室,瞄
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发布时间：2023-12-18 - 摘要：<正>国家统计局1月20日公布的数据显示,2016年12月份全国10种有色金属产量为473万吨,同比增长9.2%。112月份全国10种有色金属产量为5 283万吨,同比增长2.5%。其中,12月份原铝（电解铝）产量为289万吨,同
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发布时间：2023-12-18 - 摘要：<正>2016年伊之密压铸机订单突破6.5亿,比2015年增长了30%以上,其战略性重磅新产品H系列之中小型机上市一年更是引爆市场,首年订单金额接近8 000万元。今年,伊之密将继续加大力度向市场导入H系列,打入一更具震撼性的重锤--H系列重型压铸机（1000-4500T）全面上市。H系列重型机（1000-4500T）,是伊之密几年之前就已确定的核心战略目标,历时5年深入消化美国HPM技术精心打造而成,主要定位于与欧美知名品牌重型压铸机正面竞争。
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发布时间：2023-12-18 - 摘要：<正>由Safran Landing Systems（赛峰起落架系统公司）、Metalysis公司、斯特拉斯克莱德大学先进成型研究中心（AFRC）以及谢菲尔德大学组成的FASTForge项目团队致力于用低成本生产航空级别的钛组件。这一技术制造的低成本钛零部件有望实现钛材料的广泛应用,从而减轻飞机自重。相关:FAST-forge系统有3个步骤。由金红石砂制备钛粉末。金红石砂是廉价的氧化钛的天然来源,并且容易获得。其次,使用现场辅助烧结技术（FAST）快速加热粉末。FAST,也称为火花等离子体烧结（SPS）或脉冲电流烧结（PECS）,在生产致密的金属和陶瓷
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发布时间：2023-12-18 - 摘要：<正>深圳市长盈精密技术股份有限公司（下称"长盈精密"）与潮州三环（集团）股份有限公司（下称"三环集团"）签署成立合资公司的框架协议,双方拟共同开发陶瓷新材料应用、发展智能终端和智能穿戴产品陶瓷外观件及模组。据了解,长盈精密将发挥其在精密制造、智能制造和客户资源方面的优势,三环集团则将在先进陶瓷材料行业的技术、规模化生产方面发挥专长。根据框架协议,双方将分别成立三家合资公司,总投资额暂定87亿元,项目达产后,预计产能规模可达1亿件以上。
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发布时间：2023-12-18 - 摘要：Based on Mg-5Sn alloy as simulation object,through understanding basic physical parameters of the alloy,combining with theory of the heat transfer and solidification theory,the numerical equation of a single roller during spinning process was established,and the solidification cooling rate at free side of Mg ribbon with 84μm in thickness prepared by melting-spining is 2.26×106 K/s.The model can be suitable for simulating rapidly solidified Mg-5Sn alloy.关键词：Mg-5Sn Alloy;Single Roller Melt-Spinning;Cooling Rate;Amorphous Ribbon
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发布时间：2023-12-18 - 摘要：A non-steady method of the mixed Lagrangian and Eulerian（MiLE）method was used to simulate the continuous casting process of the large scale titanium slab ingot,focusing on influence of different ingot cross section dimensions,pouring temperature and pulling speed on the titanium ingot solidliquid interface morphology,the molten pool depth and the length of non-steady transition zone.The results show that with the ingot cross section length increasing from 200 mm to 1 200 mm,the depth of molten pool is increased to a constant value of 77 mm,while solid fraction is decreased gradually with the increasing cross section length at Ti ingot width of 200 mm.The solid-liquid interface depth of melting ingot is decreased,while solid fraction is increased gradually with increasing in cross section width at the constant ingot cross section area.The effective distance of crystallizer heat dissipation is the critical value to determine whether solid-liquid interface morphology of the titanium ingot is affected by the cross section thickness.In addition,with increasing in pouring temperature and drawing velocity,nonsteady transition zone length is increased linearly.Compared to pouring temperature,drawing velocity exhibits the major role in affecting transition zone length.关键词：Large Scale Titanium Slab Ingot;Continuous Casting;Solid-liquid Interface;Crystallizer Di mension;Transition Zone Length
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发布时间：2023-12-18 - 摘要：An orthogonal experiment and grey target model was presented to optimize the process parameters of plasma sprayed Cr2O3 on the surface of H59 brass.Two-point grey target model was adopted for processing and analyzing the test data in order to optimize the process parameters based on orthogonal test data,where arc current,argon flow,hydrogen flow and sprayed distance were taken as optimized parameters and coating hardness,tensile bond strength,coating porosity,and wear resistance of the coating as a comprehensive optimization goal.The multi-objective problem was transformed into a single objective optimization problem based on weight sum by using positive and negative target for measurement.According to the test plan and target of closeness degree program,the sketch was determined,and close to the maximum degree at the process level is taken as the optimal level.关键词：Copper Alloy;Plasma Spraying;Ceramic;Process Parameter;Grey Target;Close Degree
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发布时间：2023-12-18 - 摘要：Based on the theories of fluid mechanics,a model of blast furnace supply system was established using the FLUENT software.According to the needs of blast furnace operation process,influences of different operation ways on the tuyere blast distribution were analyzed by changing diameter of the tuyere and plugging some tuyeres.The shape of the raceway was visualized to determine effects of the blast volume,blast pressure,coke size and tuyere diameters.The results reveal that when the tuyere was plugged,the blast volume distribution could exhibit more inhomogeneous,while diameter of the tuyere was reduced from 130 mm to 120 mm,the blast volume can be decreased significantly.In addition,tuyere raceway depth was increased with increasing in the blast volume,blast temperature,tuyere diameter and tuyere insertion depth,while it was decreased with the increase of coke size.关键词：Blast Furnace;Tuyere;Raceway;Simulation
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发布时间：2023-12-18 - 摘要：To predict shrinkage porosity formed in the process of casting die inserts,the solidification process of the original casting was simulated by the ProCAST software and compared with experimental results.The results indicate that three kinds of methods predicting shrinkage porosity have a certain limitation under the condition of the process.Moreover,a comprehensive method of the qualitative method combined with shrinkage porosity critical value method can predict the defects of shrinkage porosity accurately.Based on the simulation and analysis,the casting process was optimized,and the shrinkage porosity defects were reduced effectively.关键词：Sand Casting;Numerical Simulation;Shrinkage Porosity;Casting Process Optimization
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发布时间：2023-12-18 - 摘要：In warm extrusion forming process,taking the coefficient of friction,extrusion speed,billet preheating temperature,mold preheating temperature as the independent variables,and a forming damage value,extrusion forces as the objective function,numerical simulation was performed by using DEFORM-3Dsoftware.Influences of process parameters on billet damage and extrusion force was analyzed by orthogonal test design.Grey relational coefficient and grey relation were analyzed to optimize the multi-objective parameters,and the optimized process parameter combination was presented.The results show that the order of influence on the quality of bush extrusion is friction coefficient> extrusion speed> preheating temperature of billet> mold preheating temperature,and the damage value and squeezing force of billet are decreased by using the optimized extrusion parameters,improving the billet quality.关键词：Warm Extrusion;Connecting Rod Bushing;Grey Correlation Degree;Damage Value;Extrusion Force
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发布时间：2023-12-18 - 摘要：The flow field distribution in traditional copper electrolytic cell from a domestic smelting enterprise in the process of traditional copper electrolysis was analyzed by COMSOL simulation software.The electrolyte flow situation of copper electrolytic cell at varied zone and the change of flow velocity data were presented,which provided a reference to optimize structure of cell and the reasonable selectionparameters of flow field.关键词：Traditional Copper Electrolysis;Flow Field Distribution;COMSOL;Flow Velocity
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发布时间：2023-12-18 - 摘要：<正>史杰克西为打造现代生产环境而设计的定量炉"Westomat Plus+"日前荣获芝加哥雅典娜建筑设计博物馆颁发的"优秀设计奖"。日常铸造工作中,这套新系统不仅占用空间小,能耗也极低。全球领先的工业熔炉制造商史杰克西（总部位于德国古默斯巴赫）设计了集强大功能与美丽外观于一体的Westomat Plus+。"我们希望帮助铸造厂打造同时满足员工和顾客需求的生产设备,兼顾工作环境、质量和可持续发展。新推出的Westomat Plus+是迈向绿色铸造的重要一步",史杰克西亚洲区总经理Rainer Erdmann表示。
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发布时间：2023-12-18 - 摘要：<正>帝特律电动汽车项目签约仪式,在江苏省宜兴市花园豪生大酒店举行。项目选址宜兴市环保科技工业园（"环科园"）,总投资18亿美元,设计产能10万辆电动汽车,预计2017年7月开工建设。据了解,帝特律电动汽车项目由底特律电动汽车有限公司、远东控股集团有限公司、环科园三方合资共建,总投资18亿美元,注册资金6亿美元。项目预计2017年6月奠基,7月取得部分用地许可并动工建设整车制造工厂和
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发布时间：2023-12-18 - 摘要：Semi-solid billets of Mg97Ni1Gd1Nd1 alloy were prepared by pulsed magnetic field refinement for solidification structure combined with subsequent low-temperature isothermal heat treatment.The results show that the refinement effect exhibits desirable with the pulsed voltage of 300 Vand pulsed frequency of 10 Hz,and the developed dendrite of Mg97Ni1Gd1Nd1 alloy is transformed into rosette equiaxed grains with average grain size from 650μm to about 80μm.The semi-solid billets with near-spheroidal primary phase can be obtained after treated by pulsed magnetic field below the melting point of primary-Mg and more than the melting point of eutectic structure.With treating at 560 ℃for 20 min,the spheroidizing structure in the semi-solid billets can be observed with the shape factor of 0.82.关键词：Mg97Ni1Gd1Nd1 Alloy;Pulsed Magnetic Field;Isothermal Heat Treatment;Semi-solid Billets
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发布时间：2023-12-18 - 摘要：The semi-solid ZCuSn10P1 alloy slurry was prepared by strain induced melting activation（SIMA）based on cold rolling and remelting method,and effects of forming specific pressure on microstructure and formability of the ZCuSn10P1 alloy were investigated.The results reveal that effects of different extrusion process parameters on the microstructure of the rheological squeeze casting are different.With extrusion rate of 14mm/s,the microstructure of formed parts exhibits relatively desirable,and the deformation of solid-liquid is satisfied at 150 MPa.At the same time,the liquid fraction,the solid particle roundness and the average grain diameter reach 27.6%,1.52,80.21μm,respectively.During the rheological semi-solid Tin bronze extrusion process,at the forming specific pressure of 150 MPa,the liquid fraction of the parts from top to bottom is increased from 20.1%to 33.2%,and liquid phase segregation can be observed at the bottom parts,and distribution of the solid and liquid phase has poor uniformity.关键词：ZCuSn10P1;Forming Specific Pressure;Rheological Extrusion;Microstructure Evolution
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发布时间：2023-12-18 - 摘要：Aiming at the lack of real-time data acquisition,storage and remote monitoring in the traditional low pressure casting process,low pressure casting machine data collection and implementation of remote monitoring system through the WEB client to access the database was developed by taking C8051F350 microcontroller as control core,microcontroller internal A/D achieving analogue acquisition,and using TLP521-4chip as the key component of digital data acquisition as well as sending data by WIFI on the PC side with the help of the development of software to realize the data receiving,analysis and storage.The system structure,working principle,hardware and software design were described.The developed system has the features of high precision and stability,which can achieve a number of ananlogue and digital long cycle real-time acquisition and transmission.关键词：Analogue;WIFI;Low Pressure Casting Machine
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发布时间：2023-12-18 - 摘要：In order to understand effects of shot blasting treatment on surface hardness and roughness of ADC12 aluminum alloy,the surface hardness and roughness of the samples before and after shot blasting treatment on ADC12 alloy sgueezing casting samples with various processes were measured,and their appearance after shot blasting treatment was observed.The results reveal that the roughness of ADC12 alloy sgueezing casting samples after shot blasting treatment is in range of 2.8506.515μm,and the hardness（HV）is improved to 107163from 100.In addition,the test results exhibit a certain patterns in roughness and hardness at various processes.The process of shot blasting treatment is equivalent to conduct micro forging on the surface.The constant impact of steel balls on aluminum alloy changes the original surface crystal structure of the alloy,and causes micro-convection on the surface to generate a lot of dislocation in the structure of surface crystal,which in turn harden the surface of alloy sample.The plastic deformation combined with rougher surface can increase effectively the degree of oxidation to improve the surface hardness.Surface hardness can be decreased due to generation of defects during shot blasting treatment,and with increasing in blasting velocity or blasting time,strengthening layer thickness of sample surface is increased,and it is beneficial to forming the more serious surface wave accompanied with defect formation,which is responsible for roughness increase of sample surface.关键词：ADC12 Aluminum Alloy;Squeeze Casting;Shot Blasting;Hardness;Roughness
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发布时间：2023-12-18 -
Numerical Simulation and Design Optimization of Low Pressure Casting Process for Aluminum Alloy Case
摘要：It is reasonable to design gating system according to analysis of low pressure casting aluminum alloy case structure and characteristics.It is flown smoothly in the filling process with uniform temperature field distribution by using the ProCAST software,however,due to structure complexity,there exist a lot of shrinkage porosity defect in the thick wall and hot spot position during solidification process.In the optimized scheme,by setting cold iron at the thick wall of the case and increasing sectional area of the runner exit,solidification time was shortened and the feeding channel was enhanced.High quality aluminum alloy case without defects was produced by industrial CT tomography detection.关键词：Low Pressure Casting;Numerical Simulation;Shrinkage Porosities;Design Optimization- 2
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发布时间：2023-12-18 - 摘要：Gating system for a new generation of die casting straight engine oil pan was analyzed and designed by mold flow software and defect analysis.By improving design of the gating system and the cooling system,such as setting three direction pouring,setting feeding-difficult location to near pouring gate,adopting eagle-mouth ingate at bottom and horizontal arrangement ingate at two side as well as enlarging diameters of straight water tube and adding water-preventing plate at partial location,some defects such as cold insulation,shrinkage cavity,porosity,mezzanine,burns,deformation,can be eliminated effectively.And the stability of the mould was improved.关键词：Oil Pan;Mold Flow;Gating System;Cooling System
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发布时间：2023-12-18 - 摘要：Aiming at the complicated characteristics of bimetallic turbine structure,the ultrasonic double probe method was used to detect the interface area.Firstly,the coverage and reflection of the ultrasonic beam on the interface of the turbine were analyzed by the acoustic line model.The double probe method was used to identify the defect with difference of the amplitude of the defect.Then,the finite element analysis software was used to analyze the acoustic wave propagation in the turbine.A turbine with artificial defects was detected by double probe method combined with multi-angle wedge.Experimental results show that the defect signal is very clear with the high defect location accuracy and the absolute error less than 2mm.关键词：Dual Transducer Methods;Bimetallic Turbine;Interface Defects;Finite Element Analysis
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发布时间：2023-12-18 - 摘要：Effects of Al,Ti,W,Mo,Cr content at maximum value,minimum value and middle value on microstructure and properties of superalloy K487 were investigated.The results show that there exists less carbide andγ′phase precipitated when the composition content is at low limit,and the carbide andγ′phase are increased when the composition content is at middle value,in addition,carbide andγ′phase are further increased and acicularμphase is precipitated when the composition content reaches high line.And the tensile strength and yield strength of the K487 alloy at room-temperature and 750 ℃-temperature are increased obviously,while the elongation at room-temperature and 750 ℃is decreased with increasing in composition content,especially the composition content at top-line.K487 alloy exhibits desirable comprehensive properties with the composition content at middle value
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发布时间：2023-12-18 - 摘要：The SiC/A1 composites were prepared by the lost foam casting,and distribution of the abrasive grains in fracture and bonding of the carcass and SiC abrasive grains in the foamed composite pattern were discussed with the different content and particle size of SiC before and after the filling.With the smaller SiC particle size and the more SiC particle content,the liquid aluminum cannot completely replace the foam in composite pattern when the composites are poured at the same particle content.So the SiC particles are easily flak off the composites and wear layer thickness is reduced.However,with the increase of SiC particle size and the weight of the particles,the moving distance of SiC particles is reduced,which is conducive to the retention and to increasing wear layer thickness.Increasing in the concentration of SiC particles and the thickness of wear layer,the retention effect of abrasive particles in aluminum liquid is obviously improved.The observation of the fracture morphology reveals that the matrix has high bonding force with SiC particles and it will not be changed with the increase of SiC particle content.关键词：Lost Foam Casting（LFC）;SiCp;Aluminum Matrix Composites;Particle Size
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发布时间：2023-12-18 - 摘要：A series of sandwich structure of Cu/Sn/Cu solder joints with the bump height of 10μm were prepared to understand the effects of the isothermal aging on the microstructure and shearing strength of the joints aged at 110 ℃ for 200,400,600,800 h,respectively,and microstructure evolution of the joints was characterized by SEM equipped with EDS.The results reveal that the scalloped-like Cu6Sn5 intermetallic compound（IMC）at soldering changed gradually into the combination layers of Cu3 Sn and Cu6Sn5 IMC with aging time increase,and the two layers of IMC grown thicker as a result of consumingβ-Sn in the soldering during aging process.In addition,with increasing in aging time and IMC evolution,shearing strength of the joint is increased gradually,and a part of the IMC from both sides is contacted with each other at the middle of the joints after aging for 400 h,and the shear strength came to maximum after aging for 800 h.The fracture mechanism is changed from ductile fracture to brittle fracture gradually.关键词：Cu/Sn/Cu Micro-solder Joint;Aging;Intermetallic Compound;Shearing Strength
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发布时间：2023-12-18 - 摘要：The high intensity and high strength Al2O3 ceramic green body was prepared by direct coagulation casting（DCC）in Mg2+system.Effects of different addition of MgO and dispersants on physical and mechanical properties of Al2O3 ceramics were analyzed.The results reveal that the Al2O3 with 55%solid content has release strength of 207 kPa.The viscosity of Al2O3 slurry reaches the lowest of 65mPa·s,and low viscosity slurry is conducive to vacuum agitation degassing and it is suitable for injection molding operation with dispersant concentration of 1.2%.In addition,the solidification time is 170 min when the MgO addition is 0.3%.Meanwhile the density after sintering reaches up to 3.93g/cm3,which is 99%of theoretical density.关键词：Al2O3 Ceramic;Direct Coagulation Casting;MgO;Dispersing Agent
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发布时间：2023-12-18 - 摘要：Basing on cold-rolling bonding mechanism about lamination composite materials,influence of surface treatment on bonding properties of 4A60Al/08 Al steel clodding strip by cold-rolling bonding was analyzed by changing the process parameters（different abrasive grinding）.The results show that at the same conditions,surface of the steel after treatment by abrasive belt is superior to that of the treatment by wire brush.Surface treatment by 150#180# abrasive belt is beneficial to compound 4A60/08 Al,where surface roughness reaches approximately 3.2μm,and the shearing strength of Al/steel interface is about 80 MPa.关键词：Cold-rolling Bonding;Surface Treatment Tools;Surface Morphology;Bonding Strength;Nano-Indentation Hardness
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发布时间：2023-12-18 - 摘要：Tungsten（W）coating plasma facing material was fabricated on the copper（Cu）substrate by plasma spraying technology,and effects of the spraying intensity on coating density,heat transfer capability and surface roughness were analyzed.And it was discussed for the transient high heat load performance of tungsten coating by the Nd∶YAG laser.The results reveal that the transient high heat loading is transferred on the surface of coating,and coating failure appears in the surface with absence of obvious crack in coating.The damage behaviors of tungsten coating under the laser transient heat load are involved as follows:the micro-cracks and homogeneous melting,melting tungsten ejection which enhanced the erosion of tungsten due to the splash and evaporation.关键词：Tungsten Coating;Transient High Heat Load;Plasma Spraying Technology
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发布时间：2023-12-18 - 摘要：Effects of homogenization treatment on microstructure and properties of Cu-Fe-Ag in-situ copper based composites were investigated.The results show that the homogenization treatment can refine the primary Fe dendrites and deformed microstructure,resulting in promoting the precipitation of Fe from Cu matrix to form secondary Fe particles and nano-α-Fe particle.Furthermore,the homogenization treatment can enhance the strength and electrical conductivity of Cu-Fe-Ag in-situ copper based composites.Dislocation multiplication and interface obstacle are responsible for the strengthening mechanism.The decrease of Fe in Cu matrix is responsible for the increase of electrical conductivity due to the prior homogenization treatment before cold deformation.关键词：High Strength and High Conductivity;Copper Alloy;Homogenization Treatment
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发布时间：2023-12-18 - 摘要：The structure,elastic and electronic properties of AlLi,Al2 Y,Al2La phases under different pressure were calculated by using CASTEP program based on the density functional theory.The results indicate that the calculated lattice structural parameters under 0GPa are consistent with other experimental and theoretical data.The calculated elastic properties show that the bulky modulus B,shearing modulus G,Young′s modulus E,B/Gand Poisson′s ratioυfor Al2 Y,Al2La are increased with increasing in pressure from 0to 50 GPa,so hardness and ductility of the materials are improved with the increase of pressure.However,AlLi alloy is declined slightly in bulky modulus and Young′s modulus under 45 GPa.The calculated total density of states and partial density of states for AlLi,Al2 La and AlLi under different pressures show that structure remains stable and there is no induced structural phase transformation.
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发布时间：2023-12-18 - 摘要：TC4titanium alloy plate with 20 mm thick was welded by the vacuum electron beam,and effects of the electron beam current on microstructure and mechanical properties were investigated.The results show that the grain size of the welding joint is decreased with the increase of the penetration depth.With the electron beam current increase,the grain gradient is decreased.When the electron beam current is increased from 95 mA to 105 mA,size of the martensiteα′and intergranularαphase as well asα′lath in the upper of the seam is larger than that in the middle and lower of the seam.With the electron beam current increase,intergranularαphase becomes the wider andα′lath becomes the thicker.When electron beam current is decreased to 85 mA,absence of intergranularαphase andα′lath in the lower of the seam can be observed.When the electron beam current is 95 mA,strength of the seam reaches a maximum value of 1 265 MPa,which is the higher than that of the base metal,and the joint is characterized by mixed fracture with ductile fracture and quasi cleavage fracture.关键词：Thick TC4Titanium Alloy;Vacuum Electron Beam Welding;Electron Beam Current;Micro structure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：The 7075 alloy was fabricated by controlled diffusion solidification（CDS）technology,and effects of precursor alloying component and mixing methods on size,morphology and distribution of the primaryα-Al phase in 7075 alloy were investigated.The results show that the primaryα-Al phase has the desirable shape when the mixing ratio is 1∶1at 637 ℃,where average size of the primaryα-Al reaches 91.70μm with shape factor of 2.56.The analysis reveals that at the fixed mixing temperature,the refining effect is improved with decreasing in the component of Al-Zn-Mg-Cu,while at the fixed mixing ratio,with decreasing in the pouring temperature,the primaryα-Al becomes fine and spheroidization.关键词：Controlled Diffusion Solidification（CDS）;7075 Aluminum Alloy;Primaryα-Al
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发布时间：2023-12-18 - 摘要：Al-11Si-2.5Cu-Mg aluminum alloy was prepared by metal casting method.Effects of heat treatment on microstructure and properties of the alloy were investigated by means of metallurgical microscope and tensile testing.The results show that the properties of Al-11Si-2.5Cu-Mg aluminum alloy can be further improved by heat treatment.The optimized heat treatment process for the alloy is presented as follows:510 ℃×7hsolid solution+160 ℃×8haging treatment,where tensile strength and elongation of the Al-11Si-2.5Cu-Mg aluminum alloy reach 385 MPa and 8.2%,respectively.After heat treatment,eutectic silicon phase in as-cast microstructure is transformed into spherical ones,and most of fine and dispersedly Al2Cu and Mg2Si strengthening phases are precipitated fromαsolid phase,improving strength of the alloy.关键词：Heat Treatment;Al-11Si-2.5Cu-Mg;Aluminum Alloy
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发布时间：2023-12-18 - 摘要：It is difficult to produce aluminum cylinder head by casting because of its complex structure with its uneven wall thickness.In pratical production,some casting defects,such as shrinkage porosity,easily appear.Through application of chills,the shrinkage porosity in aluminum ly linder head was eliminated.The casting’s quality and qualified rate of the aluminum cylinder head were improved,and the cost of production was decreased.关键词：Chills;Aluminum Cylinder Head;Casting Process;Application
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发布时间：2023-12-18 - 摘要：The first principles theory was applied to investigate effects of carbon nanotubes with defects（CNTs）on the adsorption of Al atoms.The results show that,compared with the adsorption of an Al atom on a CNT without defects,when an Al atom is adsorbed at the vacancy of a 51 DB defect,the adsorption energy is increased by near three times,and the system stability is increased by 120%,however,the charge transfer has not been improved.When an Al atom is adsorbed at the center of the sevenmembered C ring containing a topological defect,the adsorption energy is increased by 37%,and the system stability is increased by 19%.Meanwhile,charge transfer is increased by 45%.Therefore,mechanical strength and electrical contact performance at the interface of Al and CNTs of Al-based CNT composites can be improved by using CNTs with defects.关键词：The First Principles;Carbon Nanotube;Defect;Al Adsorption
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发布时间：2023-12-18 - 摘要：<正>主办单位:中国机械工程学会铸造分会消失模与V法铸造技术委员会承办单位:华中科技大学材料成形与模具技术国家重点实验室协办单位:山西华翔集团支持媒体:《特种铸造及有色合金》杂志、全国消失模与V法铸造技术网站（www.xsmv.com.cn）、消失模铸造界微信公众号等为了提高我国消失模与V法铸造技术水平,全国消失模与V法铸造学会将于2017年5月19日21日在山西省临汾市举办第十三届全国消失模与V法铸造学术年会暨2017国际消失模与V法铸造技术交流会,邀请国内外专家学者和工程技术人员作专题报告,欢迎从事消失模与V法铸造的企业同仁到会交流经验,促进我国消失模与V法铸造技术的发展。
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发布时间：2023-12-18 - 摘要：<正>时间:2017年5月23日;地点:重庆市雾都宾馆太阳城（★★★）一、会议主办单位重庆铸造行业协会二、会议协办单位（排名不分先后）重庆捷力轮毂制造有限公司重庆硕龙科技有限公司重庆力劲机械有限公司重庆新红旗缸盖制造有限公司广东伊之密精密机械股份有限公司迪砂、维尔贝莱特公司济南圣泉集团股份有限公司重庆市立嘉会议展览有限公司三、会议媒体支持单位（排名不分先后）
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发布时间：2023-12-18 - 摘要：<正>由中国铸造协会主办的"2017中国第二十二期消失模铸造技术培训班",由富阳市联发消失模成型设备有限公司和陕西法士特集团铸造公司承办,将于2017年4月15报到,16-18日在陕西宝鸡法士特集团铸造公司举办。学习费用:中铸协消失模分会会员并且已交2016年会费的每人1500元,其他人员每人1800元。学习时间:2017年4月15日（星期六）全天报到,1618日（星期日星期二）学习参观。
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发布时间：2023-12-18
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