最新刊期
卷 36 ， 期 11 ， 2016
- 摘要：The hot extrusion process for superalloy GH3625 was simulated numerically using finite element method on the ABAQUS.Influences of different processing parameters on the extrusion process were analyzed to obtain charge of stress and temperature fields of billet and extrusion force.By using data obtained from hot compression simulation experiment,the results show that the simulated value of extrusion force is closed to the calculated value from the empirical formula.It is established foundation to further experimental research and tube processing.The desirable processing parameters are presented as follows:initial billet temperature of 1 1801 200℃,extruding speed of 50mm/s and initial die temperature of 400℃.Morever,the preheating temperature of the die must be strictly controlled below 350℃to prevent overheating structure in practical production.关键词：GH3625 Alloy;Hot Extrusion;Numerical Simulation;ABAQUS
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发布时间：2023-12-18 - 摘要：Effects of homogenized temperature and time on microstructures and mechanical properties of as-cast Mg-4Sn-1Zn alloy during homogenization were investigated.The results show that serious dendrite is segregated at the strain boundaries and dendrites boundaries,and there exist a large amount of thick Mg2 Sn and MgSnZn eutectic phases.The temperature exhibits a more important effect during homogenization compared to the time.The eutectic phases can be dissolved into the matrix totally at 410℃for 12 h,and the dendrite segregation is eliminated,where the micro-hardness of Mg-4Sn-1Zn alloy reach 60 HV.The optimized annealing process of Mg-4Sn-1Zn alloy is homogenized at 410 ℃for 12 h.关键词：Mg-4Sn-1Zn Alloy;Homogenization;Microstructure;Micro-Hardness
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发布时间：2023-12-18 - 摘要：Al-Al2O3-ZrO2-Y2O3 composite coatings were prepared successfully on the surface of 304 stainless steel by MA technique.The microscopic morphology and structure as well as variation in thickness were observed by scanning electron microscopy（SEM）、energy dispersive X-ray spectroscopy（EDS）and X-ray diffraction（XRD）.Friction-wear and high-temperature oxidation resistance of the coatings were measured by the friction-wear tester and high-temperature oxidation experiment.The results show that coating thickness is increased firstly and then decreased with time increase.With ball-milling for 8h,the coating exhibits dense with the thickness of about 200μm.Frictional coefficients of sample after milling for 8his lower than that of one with milling for 5h,and its average coefficients is 0.148.In addition,the Al-Al2O3-ZrO2-Y2O3 composite coatings exhibit the satisfied high-temperature oxidation resistance.关键词：MA;Al-Al2O3-ZrO2-Y2O3 Composite Coating;Microscopic Morphology;Friction-wear
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发布时间：2023-12-18 - 摘要：The critical criteria of mushy zone length and bubble tip length for formation of regular pore structure in Gasar porous alloyhave been deduced through theoretical analysis and calculation to understand effects of mushy zone length and solidification rate of alloy on pore structure of Gasar multi-pore Cu-Cr alloy.The results reveal that both mushy zone length and solidification rate should be controlled in a proper values.With a given solidification rate,the mushy zone length should be smaller than the bubble tip length,while with a given alloy composition,when the solidification rate vis less than vmax,porous structure Cu-Cr alloy can be prepared successfully.关键词：Mushy Zone Length;Bubble Tip Length;Regular Porous Structure;Solidification Rate
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发布时间：2023-12-18 - 摘要：EDEM software was employed to simulate filling behavior of metal powder for preparing the cross shaped parts with different dimensions（X and Y）.The simulated results show that the inside pressure is decreased gradually along the transverse direction of the cross shaped parts,and at the same Xvalue of the cross shaped parts,the pressure is decreased with the Y value decrease.With a comprehensive comparison,the influence of the lateral size is larger than that of longitudinal size.关键词：Powder Metallurgy;Numerical Simulation;Filling Powder Flow
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发布时间：2023-12-18 - 摘要：<正>广东肇庆动力金属股份有限公司（"肇庆动力"）拟用5 200万元收购位于肇庆国家高新技术产业开发区约250亩的土地使用权,以实施其从现阶段生产场所搬迁扩建项目。肇庆动力表示,随着公司产品销售的不断增长,在未来三至五年内,公司现阶段生产场地将无法满足生产需求,也不利于新工艺、新技术的研发和改造,扩大产能建设是公司可持续发展的必然要求。肇庆动力表示,搬迁扩建项目是为了适应公司发展的需要,扩大核心产品的生产规模,为未来产品研发和生产智能化技术改
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发布时间：2023-12-18 - 摘要：<正>"目前我们已经形成了完善的锂电池体系,掌握了动力电池的结构特点、制造工艺、生产技术等,但单体电池产品均一性、稳定性、一致性及安全性等方面与国外相比还有比较大的差距。"在10月17日于浙江省湖州市举办的第九届国际电动车新型锂电池会议上,国家科技部高技术发展中心副主任卞曙光介绍了中国新能源汽车动力电池研发进展及重点部署。
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发布时间：2023-12-18 - 摘要：<正>广东韶能集团股份有限公司（韶能集团）与韶关当地政府签署合作协议,拟投资10.83亿元,开发工业机器人精密RV减速器项目和新能源汽车动力总成及传动系统项目。据了解,工业机器人精密RV减速器项目将投资2.6亿元,设在东莞（韶关）产业转移工业园,由韶能集团子公司韶关宏大齿轮有限公司（"宏大齿轮"）实施。将引进国内外先进设备,新建工业机器人精密RV减速器生产线1条,生产面积为1.5万m2,形成年产精密RV减速器6万套的生
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发布时间：2023-12-18 - 摘要：<正>全国中小企业股转系统公告显示,江西省瑞明科技股份有限公司（"瑞明科技"）拟挂牌新三板上市。据悉,瑞明科技主营业务为汽车和航空零部件的研发、生产、加工、销售和配套业务,包括汽车、航空领域各种结构件、铝铸件。公告显示,瑞明科技2014年度、2015年度、2016年13月营业收入分别为2 419.88万元、6 702.21万元、2349.27万元;净利润分别为245.03万元、751.91万元、
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发布时间：2023-12-18 - 摘要：<正>深圳市银宝山新科技股份有限公司长沙汽车零部件生产项目落户湖南长沙浏阳高新区,该项目为汽车零部件、3C产品结构件、塑胶制品、模具的生产项目。项目总投资2亿元,将于2017年试生产,正式投产后产品每年可供整车上万台（套）。银宝山新系深交所上市企业,在国内拥有7个生产基
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发布时间：2023-12-18 - 摘要：<正>近日,由重庆大学牵头承担的"大规格高性能镁合金变形加工材制造关键技术"项目获批,并获得3 400万元专项经费。该项目对解决变形镁合金产品制造关键技术瓶颈问题,推动我国镁产业更大规模的推广应用有积极意义。镁合金的推广应用对缓解我国日益严峻的环境和能源危机具有重要意义,同时也对我国关键装备和重大工程的轻量化问题具有举足轻重的作用。近10多年来,国内外铸造镁合金的发展成效明显,我国铸造镁合金应用量已大幅度增加,但具有更大应
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发布时间：2023-12-18 - 摘要：<正>国内媒体报道,2016年8月,云南铜业压铸科技有限公司的压铸铜转子订单量8 640台,9月订单量9 386台,连续创造2013年工业化生产以来历史新高。目前,云铜压铸铜转子订单总量突破4.5万台。2012年以前,云铜压铸公司每个月铸铜转子订单量只有910台。2007年,云南铜业压铸科技有限公司建成亚洲唯一的
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发布时间：2023-12-18 - 摘要：<正>10月19日,陕西华镁特材科技有限公司"高性能钛合金及变形镁合金制品产业化项目"在陕西省宝鸡市眉县霸王河工业园区隆重开工,从而揭开了华镁特材打造"钛镁新时代"的序幕。该项目前期依托核心团队在高性能钛合金制备领域形成的专有技术与市场积累的基础上,充分利用并发挥钛谷的产业链配套和产业资源聚集优势,以高性能钛合金、高强度镁合金热加工技术及其先进表面防护技术的研发为主导,以技术创新带动先进材料制品的产品升级,从而提升国内高比强度轻质合金（主要为钛合金、镁合金）的热加工装备保障能力、开发能力及产品综合竞
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发布时间：2023-12-18 - 摘要：<正>近日,广东文灿压铸股份有限公司设在天津的压铸生产基地——天津雄邦压铸有限公司成功试生产,试产的为两套840吨和2 500吨压铸单元。天津生产基地位于天津经济开发区西区,项目占地10万平方米,总建筑面积7.5万余平方米,2016年4月动工建设。日前,文灿股份公布中期报道,上半年,公司实现营收5.21亿元,同比下滑7.54%;净利润为5 727.26万元,同比下滑
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发布时间：2023-12-18 - 摘要：<正>2016年10月10日,债权人对江苏江旭铸造集团有限公司（"江旭集团"）破产清算的申请,正式获得宜兴市人民法院裁定受理,此举标志着江旭集团正式进入破产清算程序。法院公告称,经审查,江旭集团结欠农商行阳羡支行巨额债务,且该集团涉及多起诉讼案件,资产被法院数次查封,明显缺乏清偿能力。根据相关法律,其债权人宜兴农商行阳羡支行有权对江旭公司破产清算。江旭集团为集有色金属压力铸造、低压铸造、挤压铸造、重力铸造、砂型铸造、壳型铸造、机械加工及模具设计制造于一体的
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发布时间：2023-12-18 - 摘要：<正>2016年11月初,德阳东深新能源科技有限公司实现了首批铝空金属燃料电池（简称"铝空电池"）产品下线。铝空电池用途广泛,以之为基础的铝燃料UPS并非德阳希望量产的唯一产品。"让铝空电池一举成名的应用,还是在新能源汽车领域。"说起这项"黑科技",中国工程院院士欧阳晓平说,两年前,就有公司号称用铝原料、水和空气发电的铝空电池"仅靠注水可续航达3 000公里",当时一度引起轰动。"国外试验可达3 000公里,德阳试验的结果是’装30kg铝续航1 000公里’。"东
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发布时间：2023-12-18 - 摘要：<正>天润曲轴股份有限公司发布公告称,拟通过发行股份及支付现金的方式,合计7.7亿元购买东莞鸿图精密压铸有限公司100%股权。其中,现金对价3亿元,其余由上市公司通过发行股份方式支付。同时,天润曲轴拟非公开发行股份募集配套资金4.7亿元,用于支付本次交易的现金对价、投入梧州鸿图高精密铝合金汽车发动机关键零部件制造项目、支付中介机构费用。2016年9月,天润曲轴曾发布公告称,暂定拟7.7亿元收购东莞鸿图100%股权。当时,尚未完成标的资产的审计评估公
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发布时间：2023-12-18 - 摘要：The dynamic recrystallization model of Ti-47Al-2Nb-2Cr alloy was established with high temperature hot compressive data.Combined with the cellular auto mata model（CA）,the microstructure evolution during the hot deformation process was simulated by the DEFORM-3Dsoftware.The experimental results show that the dynamic recrystallization occurs and grain size is refined with the deformation at 950℃and the strain rate at about 0.1s-1.The average grain size at the severe deformation zone is about 0.63μm,which is well agreement with the simulated ones.The microstructures of CA simulation was observed with different strain rates at 950 ℃.Due to occurrence of dynamic recrystallization,the average grain size is decreased with the increase of strain rate.The CA simulation of microstructure evolution can reflect the EBSD morphology.关键词：Ti-Al Alloy;Dynamic Recrystallization;Cellular Automaton;Microstructure
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发布时间：2023-12-18 - 摘要：In order to obtain the evolution of mesoscopic grains during solidification process,simulations were performed for the nucleation and growth of grains using cellular automaton,where the temperature field model is from InteCAST,and the frame shape castings were produced to validate the model.The results show the a higher cooling rate will cause the high grain density,and the distribution of grain size can meet basically the normal distribution.The simulated result is well in agreement with the experimental ones.关键词：Cellular Automaton;Mesoscopic Grains;Cooling Rate;Grain Size
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发布时间：2023-12-18 - 摘要：Copper anode plate casting machine is the key equipment for producing copper anode plate.Aiming at the shaking,impacting in the process of original disc casting machine operation,and flash,burr or other poor appearance,the parameter optimization model of the transmission system of casting machine was established,in which radius of the driving wheel and the center distance are taken as the design variables to optimize the angular acceleration of the original disc casting machine.Adams software was used to analyze the angular displacement,angular velocity,angular acceleration of the original and new casting machine.The results show that not only the optimized transmission system meets the requirements of displacement,but also the operation process is more stable,greatly improving the dynamic characteristics of machine casting.As a result,the copper anode plate surface exhibits more smooth with absence of edge,burr,so decreasing the failure rate of copper anode plate.关键词：Disc Casting Machine;Transmission System;Dynamics Simulation;Parameter Optimization
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发布时间：2023-12-18 - 摘要：The automatic scoring model of customer satisfaction and credibility was established to classify customers reasonably and looking for the 20%customers who give us 80% of the profits.By implementing differentiation services on different kinds of customers,customer satisfaction and credibility were fully quantitatively assessed,and a"customer as the center"service concept was established,enhancing the core competitiveness of casting enterprise.关键词：Customer Satisfaction;Customer Credibility;Foundry Enterprise;Automatic Scoring
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发布时间：2023-12-18 - 摘要：The rear cover of transmission box was produced by vacuum die casting.The difference between vacuum die casting and common die casting production was analyzed comparatively from metallographic,internal microstructure and heat treatment.The results show that the vacuum die casting products exhibit the high compact microstructure and less porosity with the decrease of reject rate,which can save product cost and improve the quality of products.关键词：Vacuum Die Casting Technology;Die Casting Mould;Vacuum Die Casting;Traditional Die Casting
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发布时间：2023-12-18 - 摘要：Due to the large aluminum shell with large volume,complicated structure and long solidification time,it is easy to generate casting defects,such as shrinkage cavity and shrinkage porosity.The flow field and temperature field in pouring process were simulated by the ProCAST software to visualize the potential defect position.Based on the simulated results,chills were placed at the defective area to play a strong cooling forced,which could improve the temperature field of the casting and make the castings conform to the principle of sequential solidification,eliminating effectively the shrinkage in the casting and predicting the ogenerated defect region,so the quality of the qualified rate was improved.The product is qualified by X-ray detection.关键词：Shrinkage Cavity;Chills;Pressure Vessel;ProCAST Software
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发布时间：2023-12-18 - 摘要：During die casting process,the local pressurization parameters were designed by experience,resulting in the fluctuation of the part quality.The local pressurization parameters for a cylinder head cover were optimized by the DOE technique to reduce the porosity and improve the quality.After computer simulation,the optimized parameters were presented.The results reveal that by applying optimized pressurization parameters,internal quality is improved significantly,and the steady of pressurization process is improved,increasing economic efficiency greatly.关键词：DOE;Local Pressurization;Die Casting;Improvement
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发布时间：2023-12-18 - 摘要：According to the structural characteristics of aluminum alloy base parts,the gating system was designed.Filling and solidification process of die casting process was simulated by the ProCAST.The optimized processing parameters were presented as follows:casting temperature of 610 ℃,preheating temperature of 180℃for mold,injection speed of 2m/s.Die-casting die was designed and manufactured to produce qualified aluminum alloy base parts,which verified the rationality of the simulated results.关键词：Die-Casting;Numerical Simulation;Base;Process Optimization
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发布时间：2023-12-18 - 摘要：Effects of EPC pressure field on the mechanical properties of ZL101 aluminum alloy components were investigated.The MGM（1,N）model of pressure and density,tensile strength as well as hardness of the parts was established,and background value of the model was optimized.MGM（1,N）model can be used not only for fitting complex relationship between pressure and mechanical properties of the parts,but also for predicting density,tensile strength and hardness of the castings under different pressure.The results show that the model has a high prediction accuracy,exhibiting apositive role in lost foam process optimization of ZL101 aluminum alloy.关键词：ZL101 Alloy;EPC Casting;MGM（1,N）;Mechanical Properties;Prediction
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发布时间：2023-12-18 - 摘要：The traditional investment casting technology is not suitable for manufacturing complex parts due to its time-consuming and high costs.Wax pattern making based on 3D-printing can solve obviously the problem.The basic properties of impeller material was calculated by JMatPro software.The effects of different types of gating system were analyzed by the ProCAST software.The optimized gating system was presented based on filling sequence and result in the impeller through the ProCAST simulation.关键词：3D-Printing;Impeller;Inverstment Casting;Numerical Simulation;Process Optimization
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发布时间：2023-12-18 - 摘要：The effects of gating system and main processing parameters on forming of A356 truss core panel produced by low pressure investment casting process have been simulated by the Anycasting software.And optimization of processing parameters has been carried out based on analysis of the simulation results.The results show that with the increase of pouring temperature,filling ability of liquid metal is increased and the defects in castings are reduced.However,with the pouring temperature more than 770℃,shrinkage porosities（holes）are increased slightly.Based on the simulated results,the optimized process parameters are presented as follows:pouring temperature of 770 ℃,shell preheat temperature of 200 ℃ and filling velocity of 40mm/s.Then the validity of proposed results has been confirmed by the practical production.关键词：Truss Core Panels;Low Pressure Die Casting;Investment Casting;Numerical Simulation
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发布时间：2023-12-18 - 摘要：<正>美国的苹果计算机（APPLE）公司在多年前推出的一款钛合金笔记本电脑。该电脑外壳采用1级工业纯钛做外壳。这也是目前世界上第一个用纯钛作外壳的电脑。电脑整体厚25.4mm,重2.4kg。钛用于电脑外壳在钛行业和计算机行业都具有很大的影响力。交货的钛外壳颜色为灰色,通过氧化着色,可将钛外壳变为红色、紫色和黄色。苹果公司推出的这台钛外壳电脑能够挑战日本索尼公司采用镁合金外壳的电脑,不但具有美观的外形,而且还具有优良的
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发布时间：2023-12-18 - 摘要：A continuous casting and rolling process of ZL114 Aaluminum alloy wire rod was established.Microstructure analysis of wire shows that the grain size of the edge of the wire is the smaller than the size of the core.With the rolling process,the core grain size of the cross-section of the wire is refined gradually,and the grain of longitudinal section is elongated along the deformation direction,meanwhile,distribution of the second phase is also changed from distribution along grain boundaries to distribution along the deformation direction.Welding test reveals that continuous casting-rolling technology can be used in the production of welding wire blank.关键词：ZL114A Aluminum Alloy;Continuous Casting-rolling;Aluminum Welding Wire
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发布时间：2023-12-18 - 摘要：Through adopting Euler-Lagrange method based on CFD,particle distribution of particle reinforced SiO2/Al composites at different stirring speed（200,400,600r/min）was simulated.SiO2/Al composites were prepared at different stirring speed to observe particle distribution at varied position.The results reveal that quantative results are well in agreement with the simulated ones.Particle can agglomerate at some certain region under inappropriate stirring speed.400r/min is satisifed.关键词：Composites;Stirring Casting;Numerical Simulation;Particle Distribution;Flow Field
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发布时间：2023-12-18 - 摘要：Effects of adding Cu foil on AZ31 magnesium with 2mm in thickness and 5052 aluminum dissimilar alloys welding were investigated by frictional stirring welding.With the help of optical microscopy,XRD,micro-hardness tester and computer control electronic universal testing machine,microstructure and performance of the welding joint were tested.The results reveal that,after adding Cu foil at the layup,with rotational speed of 1 200r/min and travel rate of 100mm/min,absence of macroscopic crack can be observed on the surface of jiont,and tensile strength of the joint can reach 86.2 MPa,and the crack welded joint is formed on the side of magnesium.Moreover,the welding center exhibits the the highest hardness.The XRD analysis reveals that there exists intermetallic compound of Al3Mg2、Al12Mg17、AlCu、Al2Cu、MgCu2in the welding line.关键词：Frictional Stirring Welding;Aluminum Alloy;Magnesium Alloy;Microstructure
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发布时间：2023-12-18 - 摘要：Effects of 10% ZrO2 and 2%,4%,6%and 8% SiO2 as additives on microstructures and properties of composite plate fabricated by self-propagating high temperature synthesis were investigated in Al-Fe2O3 system by SEM,XRD and tensile testing.The results reveal that the grain is soundly distributed in surfaces of composite layer,and Fe can be observed in the ceramic layer.Ceramic layer is mainly composed ofα-Al2O3、FeAl2O4、Al2SiO5and ZrO2 by XRD analysis.It is also found that the porosity in ceramic layer and shearing strength of the interface reach 10.3% and 10.2MPa with 2% SiO2 and 10%ZrO2addition,which are reduced by 23.7% and improved by 36%than those of ones without additives,respectively.关键词：Self-Propagating High Temperature Synthesis;SiO2;Composite Plate
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发布时间：2023-12-18 - 摘要：With adding 3%9% Si into Mg-9Al alloy,the in-situ Mg2Si/Mg-9Al matrix composites with10%30% Mg2Si were fabricated successfully by induction heating.The microstructure and solidification mechanism of the composites prepared were investigated by optical microscopy（OM）,scanning electron microcopy（SEM）,X-ray energy-dispersive spectrometry（EDS）,X-ray diffraction（XRD）and differential thermal analysis（DTA）.The results indicate that the composites prepared are composed of Mg2Si,Mg17Al12and Mg phase.The amounts of both Mg2Si and Mg17Al12 phase are increased with the Si content increase.During cooling process,Mg+Mg2Si eutectic phase can be generated after the precipitation of primary Mg2Si,and the eutectic Mg2Si phase is grown on the primary Mg2Si.The Al content in the Mg-9Al matrix is increased with the Si content,which affects the solidification behavior of the Mg-9Al matrix.关键词：Mg-9Al Matrix Composites;Mg2Si;Solidification Mechanism
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发布时间：2023-12-18 - 摘要：Mechanical vibration was conducted in process of filling and solidification of A356 alloy to understand effects of mechanical vibration frequency,vibration amplitude and vibration direction angle on the gas hole,grain and mechanical properties of the alloy.The results show that mechanical vibration on A356 alloy can reduce the number of pinholes in the alloy,and be helpful for gas hole moving to riser.With the increase of mechanical vibration frequency,tensile strength and elongation of the A356 alloy are increased firstly and then decreased,and the maximum values can be obtained with the mechanical vibration frequency of 30 Hz.In addition,with the increase of mechanical amplitude,the tensile strength and elongation of the alloy are increased firstly and then decreased,and the maximum value can be observed with the vibration amplitude of 0.3mm.Meanwhile,with the increase of mechanical vibration direction angle,tensile strength and elongation of the A356 alloy aredecreased gradually.The proper mechanical vibration parameters of A356 alloy are presented as follows:vibration frequency of 30 Hz and vibration amplitude of 0.3mm as well as direction angle of vibration of 90°.关键词：Mechanical Vibration;A356 Alloy;Gas Hole;Mechanical Properties;Microstructure
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发布时间：2023-12-18 - 摘要：Effects of Sr,P and Sr+P modification as well as heat treatment on the primary Si phase morphology and distribution,electrical conductivity and hardness of ADC12 aluminum alloy were investigated in order to improve its electrical and mechanical properties,and comprehensive properties of the ADC12 alloy were improved further by T6 heat treatment.The results show that the electrical conductivity of alloy with Sr addition reaches 19.7MS/m,which is increased by approximately 30%comparaed with that of the unmodified alloy,and then Sr+P modified alloy,P modified alloy,while effect of modification on the hardness of the ADC12 alloy can be negligible.The electrical conductivity and hardness of aluminum alloy are largely improved by T6 heat treatment,where the electrical conductivity and hardness of the T6 treated alloy with Sr modification reach 22.3 MS/m and 130 HBW,respectively.关键词：Modification;Heat Treatment;Electrical Conductivity;Hardness
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发布时间：2023-12-18 - 摘要：Effects of different ultrasonic vibration temperature on microstructure and mechanical properties of ZL114 Aalloy were investigated by optical microscopy,tensile testing,and the fracture morphology of alloy was observed by scanning electronic microscopy（SEM）.The results reveal that the ultrasonic vibration temperature can affect greatly microstructure and mechanical properties of ZL114 Aalloy.With the increase of ultrasonic vibration temperature,the solidification structure of alloy is converted from the developed dendrite to the columnar dendrite,and finally to the dendrite.The lower or higher ultrasonic vibration temperature can weaken refinement effect.The optimized ultrasonic vibration temperature is 700 ℃,so the desirable comprehensive mechanical properties are presented,where the tensile strength and elongation of ZL114 A alloy reach 289 MPa and 4.62%,respectively.The fracture mechanism of alloy is characterized by ductile fracture with a large number of dimples.关键词：Ultrasonic Vibration Temperature;Solidified Structure;Mechanical Properties;ZL114A alloy
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发布时间：2023-12-18 - 摘要：Hydrogen pump apparatus was made up of CaZr0.9In0.1O3-αproton conductor as solid electrolyte,Ni-Cr wire as electrode wire.The molten aluminum was dehydrogenated by short-circuiting the pump.Furthermore,both the gas carrying and extracting hydrogen methods were used to increase the dehydrogenation rate.Meanwhile,the hydrogen sensor was employed to measure the hydrogen content in the molten aluminum quantitatively to monitor the dehydrogenation effect.The results reveal that under the extracting hydrogen condition,the hydrogen content can be reduced from 79.84mL/100g·Al to 0.15mL/100g·Al.It proves that short-circuit method to dehydrogenate aluminum is practicable.In addition,the dehydrogenation effect was analyzed with the pump applied 1.5Vvoltage.The results reveal that the hydrogen content is dropped from 6.43mL/100g·Al to 3.67mL/100g·Al.关键词：Proton Conductor;Dehydrogenation of Molten Aluminum;Electrochemical Hydrogen Pump;Hydrogen Sensor
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发布时间：2023-12-18 - 摘要：Influences of solution treatment on microstructure and mechanical properties of 7021 aluminum alloy plate were investigated with the help of microstructure observation and tensile testing.The results reveal that with the increase of solution temperature and holding time,the un-dissolved particles are dissolved gradually in the alloy matrix.After artificial aging at 120℃for 24 h,the strength of 7021 is enhanced increasingly.With the solid solution treatment at 380 ℃for 40 min,the strength of 7021 alloy reaches the maxium value.With the further increase of the solution temperature or time,fiber tissue in the alloy is recrystallized,so the grain is grown continuously,resulting in the decrease of strength and the increase of elongation.The optimum solution treatment for 7021 alloy plate is at 380 ℃for 40 min.关键词：7021 Alloy;Solid Solution Treatment;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Effect of heat treatment process and extrusion on microstructure and properties of WE91 alloy were investigated by means of optical microscopy,scanning electron microscopy,X-ray diffraction,transmission electron microscopy and mechanical property tests.The results reveal that the as-cast WE91 alloy is composed mainly ofα-Mg matrix and eutectic structures of Mg24Y5 and Mg12（MM）phases.After homogenization treatment,most of eutectic structures in the alloy are dissolved fully besides the Mg12（MM）phase.After extrusion treatment,the alloy undergoes dynamic recrystallization,so the grain size of the alloy is decreased significantly.The residual Mg12（MM）phase is distributed along extrusion direction.With treating at 225 ℃ for 28 h,numerous long lens-shapedβ′phases are precipitated.After aging treatment,the alloy exhibits good resistance at high temperatures.The strength of the alloy is reduced slightly below 250℃,however,strength of the alloy is reduced significantly at 300℃.As the testing temperature increase,the crack propagation is changed from transgranular to intergranular.关键词：MM;Magnesium Alloy;Microstructure;Mechanical Properties;Fracture Behavior
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发布时间：2023-12-18 - 摘要：8 series continuous casting aluminum alloy rod with 0.03%0.06% Si,0.010%0.015%B and 0.10%0.60% Fe was produced,electric and mechanical properties of the aluminum alloy rod were tested.The results reveal that with increasing in Fe,electric resistivity of the aluminum alloy rod is increased firstly and then to be stable.Tensile strengh of the aluminum alloy rod is increased rapidly and increased slowly with increasing in Fe.To meet the electric and mechanical properties of the rod,Fe content should be controlled in range of 0.28% 0.43%.关键词：Iron Content;Tensile Strength;Resistivity
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发布时间：2023-12-18 - 摘要：Based on the principle of concentration difference cell method,a hydrogen sensor was developed on the basis of the high-temperature solid electrolyte,and a hydrogen analyzer for aluminum alloy melt was developed by application of the sensor.The hydrogen analyzer was used for real-time measurement of hydrogen content in aluminum melt,and at the same time a hydrogen analyzer based on the first bubble method was also used to measure the hydrogen content of aluminum melt.By comparison of the results from two hydrogen analyzers,the new hydrogen analyzer can measure accurately and quickly the hydrogen content of the aluminum melt.关键词：Concentration Difference Cell Method;Hydrogen Content;Hydrogen Analyzer;Aluminum Alloy;Hydrogen Sensor
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发布时间：2023-12-18 - 摘要：The effects of DC magnetic field treatment of 1.4T,1% Zr and compound treatment of DC magnetic field and Zr on solidified structure and mechanical properties of Mg97Y2Cu1 alloy reinforced by long period ordered structure were investigated comparatively.The results show that CuZr2 phase can be observed in the alloy,and solidification structure in the alloy can be refined markedly with Zr addition.Whether or not with Zr addition,the influence of DC magnetic field on solidification structure of the alloy can be neglected.Many new diffraction peaks appear in the alloy after adding Zr,while the diffraction peak intensity of crystal plane（100）of the alloy is the much higher than that of other planes under DC magnetic field treatment.Under the combined action of magnetic field and Zr,the diffraction peak of the alloy is changed between single magnetic treatment or Zr treatment.DC magnetic field or Zr can improve effectively mechanical properties of the alloy,and the combined effect of DC magnetic field and Zr exhibits desirable.Tensile strength and elongation of the alloy reach 194.5MPa and 6.01%,which are increased by up to 63.45% and 11.30%,respectively,compared with those of the alloy without treatment.关键词：DC Magnetic Field;Zr;Mg97Y2Cu1 Alloy;Solidification Structure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Cu-based Cu-2.8Ni-0.7Si alloy ribbons with 50150μm in thickness and smooth surface were prepared by single roller spinning quenching method.The ribbons prepared were heat treated at 400500 ℃for varied time.Effects of the temperature and aging time on the electrical conductivity and tensile strength of the ribbons were investigated.The results reveal that electrical conductivity of the ribbons is increased gradually while tensile strength is increased firstly and then decreased with the aging time increase at the fixed temperature,and the tensile strength after peak aging is increased with the increase of aging temperature.The electrical conductivity of the ribbons is increased linearly with the contents ofδ-Ni2Si as the precipitation phase.Dynamics of theδ-Ni2Si phase formation was estimated by the Avrami equation,and electric conductivity equation of precipitatingδ-Ni2Si phase from the Cu alloy ribbons was determined.In addition,the dynamic curves of the relations between precipitation and aging times were calculated.关键词：Cu-2.8Ni-0.7Si Alloy;Aging Treatment;Tensile Strength;Electrical Conductivity
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发布时间：2023-12-18
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