最新刊期
卷 36 ， 期 10 ， 2016
- 摘要：GH4169nickel-based superalloy sample was prepared by TIG welding rapid forming.The microstructure and mechanical properties of the sample prepared were investigated.Microstructure analysis reveals that coarse columnar crystals are continuously grown from the substrate.The transition between the layers is not obvious,and absence of macro metallurgical defects can be observed.There exists only a few dispersed pores in the sample.Recrystallization occurs during heat treatment,and size distribution of the recrystallized grains are varied at different regions,where grain size at the bottom of the sample exhibits the smallest and uniform,while the dendrite size closer to the top of the sample becomes coarse.The hardness of the sample along the deposition direction shows a decreasing trend from the bottom to the top before and after heat treatment.Tensile tests indicate that the mechanical properties of heat treated samples at different regions are improved.The maximum tensile strength can reach up to 1 250 MPa,which is closer to the forged part standard,however,partial differences in ultimate tensile strength still exist.关键词：Welding Rapid Forming;Nickel-based Superalloy;Microstructure;Properties
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发布时间：2023-12-18 - 摘要：Effects of heat treatment on microstructure and stress rupture properties of investment casting K4169 alloy components after hot isostatically pressed（HIP）treatment have been investigated.It is found that amounts ofδ-Ni3 Nb phase with needle-like morphology can be precipitated both at the grain boundaries and in the inter-dendritic region around the carbides for the HIPed specimens with post solution and aging treatment（HIP+STA）.However,absence of Laves phase and needle-likeδ-Ni3 Nb phase precipitated in the inter-dendritic region can be observed for the HIPed specimens with direct aging treatment（HIP+DA）,and the submicronγ″phase precipitated during HIP processing is also preserved in theγ matrix.It clarifies that the hot isostatic pressing with direct aging（HIP + DA）treatment process can improve effectively creep rupture properties both in duration time and elongation.It is suggested that the network submicronγ″particles similar to lens is beneficial for creating a large number of annealing twins,which are contributed to its increase in the stress-rupture properties.关键词：K4169Superalloy;Hot Isostatic Pressing;Heat Treatment;Stress Rupture Properties
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发布时间：2023-12-18 - 摘要：Based on the finite element method and theory of structural mechanics,static and dynamic stress of the Ti/TiC laminated composites were investigated by ANSYS software,and the finite element model was established.The results show that the mechanical properties of Ti/TiC laminated composites are improved significantly compared with those of Ti.When the thickness-layer ratio is 2∶1,the simulated bending strength of laminated composite reaches 1 684.26 MPa,which is closed to the experimental value 1 571.51 MPa.Under impact loading,the six order modal values of Ti/TiC laminated composites are the higher,so it is difficult to generate the resonance,and more energy can be converted into potential energy with less absorption.关键词：Laminated Composites;Finite Element Method;Static Stress Analysis
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发布时间：2023-12-18 - 摘要：Intermetallic Ti-47Al（in atomic fraction）and Ti-47Al-1W-0.5Si（in atomic fraction）alloys were produced by ISM method.Macro-and microstructure evolution was investigated by optical microscopy（OM）and scanning electron microscopy（SEM）.The macrostructure of ingot is composed of two different direction columnar grains due to the chilling of side wall and bottom in steel mould.The growth direction of the columnar grains is the preferred direction<0001>.The all lamellar orientation in columnar grains is perpendicular to the growth direction for the determined relationship of the solidstate phase transformation.A small amount of Si element added in the alloy can generate eutectic Ti5Si3 particle phase,and a little of B2 phase can be observed in Ti-47Al-1W-0.5Si alloy because of the addition of W as solid strengthening effects and the faster cooling rate.The addition of W and Si can refine the lamellar structure and improve mechanical properties of the Ti-47 Al alloy.The alloys have the high yield stress when the compression stress is parallel to the lamellar interface,and alloy crack is propagated alongα2/γlamellar interface,while alloys have the higher compression stress and strain when the stress is perpendicular to the lamellar interface,and fracture mode is characterized by crack crossingα2/γlamellar interface.关键词：Ti-Al Alloys;Microstructure;Alloying;Ambient Compression
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发布时间：2023-12-18 - 摘要：<正>总投资10亿元的"中利科技集团太阳能光伏逆变器压铸生产项目"正式签约落户东莞石排镇。中利科技集团董事长王柏兴和石排镇委副书记、镇长翟耀东在《投资协议书》上签字。据了解,中利科技集团是国家级高新技术企业、深交所
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发布时间：2023-12-18 - 摘要：<正>2016年8月,科技部公布了国家重点研发计划重点基础材料提升与产业化重点专项2016年度项目立项清单,由我国特种铜合金加工技术领域15家优势单位组成的产学研用科技合作团队共同承担的"高性能铜合金特种加工材制造技术"项目获批立项。项目牵头承担单位为北京有色金属研究总院,项目推荐单位为中国有色金属工业协会,项目负责人为北京有色金属研究总院（怀柔）副院长米绪军教授,项目总经费8 300万元、
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发布时间：2023-12-18 - 摘要：<正>9月27日,山东银光钰源轻金属精密成型有限公司自主研发的"汽车发动机、变速箱镁合金支架类结构件压铸工艺技术"科技成果评价会在北京召开。由工业和信息化部组织的评价委员会听取了项目完成单位的技术总结报告,
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发布时间：2023-12-18 - 摘要：<正>从中国核工业集团获悉,经报内蒙古国土资源厅备案,核工业二〇八大队在内蒙古乌拉特中旗高勒图矿区发现全国最大晶质石墨单体矿,晶质石墨矿石资源量31 595.72万吨,矿物量（固定碳）1580.88万吨,平均品位（固定碳）5%,均为新增矿产资源量。矿体长2 100米,控制最大延深703米,矿石为晶质石墨二云母片岩。
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发布时间：2023-12-18 - 摘要：<正>随着车用铝材的应用越来越广泛,中国忠旺在该市场的提前布局或使其抢占市场先机。据专家预测,20162025年,铁基合金在汽车上的应用将在同更轻质的铝合金竞争中明显落于下风。其中,汽车用铝首推铸造铝合金、锻
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发布时间：2023-12-18 - 摘要：<正>9月28日,2016年国家重点研发计划项目"大规格高性能镁合金变形加工材制造关键技术"在重庆大学正式启动,该项目由重庆大学牵头,中国科学院金属研究所、上海交通大学、重庆长安汽车股份有限公司等21家单位共同承办。
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发布时间：2023-12-18 - 摘要：<正>密度只有铝合金2/3、钢铁2/9的镁材料被认为是车身轻量化的方向之一。在攻克5大核心技术难题之后,9月29日,世界第一辆镁合金轻量化电动客车在山东下线。这辆长8.3米、24座的电动客车车身骨架全部采用镁合金材料,相对于钢铁材料实现减重780kg,相对铝合金材料
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发布时间：2023-12-18 - 摘要：<正>镁合金项目是国家新能源行业节能环保重点产业,计划年产15 000t镁合金产品。其中8 000t镁合金棒材,5 000t镁合金中厚板,2 000t其他镁合金铸件。技术在国内外都处于排头兵地位,建设中国交通装备轻量化基地,为振兴民族工业、打造"中国创造"作出贡献。在国资委、科技部、中建材、中材、中电建、中技报、中科投、中科建等单位支持下,中国北斗科技中心牵头筹备
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发布时间：2023-12-18 - 摘要：Erosion wear behavior of high chromium cast iron with different Cr content（Cr12,Cr15,Cr23 and Cr28）was observed in liquid-solid two-phase flow（H2SO4+quartz sand）.Surface morphologies and the phase constituent of corrosion products were analyzed by means of optical microscope（OM）,scanning electron microscopy（SEM）and X-ray diffraction（XRD）.Erosion wear behavior was investigated by the analysis of weight loss per unit area.The results reveal that the matrix is firstly susceptible to corrosion,and corrosion products have an important influence on erosion wear behavior.When Cr content is lower than 15%,corrosion products have the absence of oxidation film or presence of Fe2O3 film,so weight loss per unit area is increased as a result of the interaction of corrosion and erosive wear.With more than 23% high chromium cast iron,the corrosion products are mainly composed of Fe2O3 and Cr2O3.With thickness of Cr2O3 film increased to a certain degree,the erosion wear behavior is delayed,so weight loss per unit area is increased firstly and then decreased.关键词：Erosion-corrosion;Wear;High Chromium Cast Iron;Fluid-solid Two-phase Flow
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发布时间：2023-12-18 - 摘要：In order to reduce the thinning,wrinkle and fracture of the double stepped cylindrical cup in the vacant areas which was shaped by one-step hydro-mechanical deep drawing,two-step hydro-mechanical deep drawing was introduced.The finite element model of hydromechanical deep drawing was established by the Dynaform software.The effects of process parameters such as forming pressure and mould parameters were analyzed by the finite element method in detail,and the optimized process parameters were presented.The results indicate that the proposed technological method is feasible for the integral forming of the double stepped cylindrical cup.Moreover,parts with uniform thickness distribution and high quality can be formed successfully by using the optimized parameters,and the final minimum wall thickness can be reached up to 0.851 mm.
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发布时间：2023-12-18 - 摘要：The corrosion behavior and corrosion mechanism of 5Cr5MoSiV1 steel after different heat treatment processes in neutral and acidic environment were investigated by polarization curve,electrochemical impendance spectroscopy and scanning electron microscopy.The results reveal that the type of surface damage of 5Cr5MoSiV1 steel is characterized by pitting corrosion and intergranular corrosion in3.5% NaCl solution and in 0.05mol/L H2SO4 solution.After the electrochemical test,the sample treated at 1 050 ℃ quenching and air cooling has the desirable corrosion resistance,which is attributed to more Cr atom dissolving in the Fe matrix,thus increasing the compactness of the protection surface film and improving its corrosion resistance.关键词：5Cr5MoSiV1 Steel;Heat Treatment;Corrosion Resistance
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发布时间：2023-12-18 - 摘要：The measurement of hydrogen content in aluminum and aluminum alloy melt is an important process to reflect the degassing effect and to ensure the quality of the melt,and it is significant to improve the casting’s quality.The instruments and features of several popular measurement techniques,such as Telegas method,electrochemical method,pressure evaluation method based on Sievert’s law were analyzed,evaluated and compared.It is indicated that those measurement techniques improving high testing speed and decreasing instrument and testing cost will be the future direction of development.关键词：Aluminum and Aluminum Alloy;Hydrogen Content;Quantitative Measurement
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发布时间：2023-12-18 - 摘要：Different physical effects of electric field on the solidification structure in metallic alloys were reviewed,focusing on the influence and mechanism of metallic melts,solid-liquid interface and directional solidification treated by the pulsed alternating current.Finally,problems in the current research on pulsed alternating current treatment on solidification were analyzed,and prospects for the future research were described.关键词：Solidification;Alternating Current;Mechanism
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发布时间：2023-12-18 - 摘要：According to requirements of completely solving blowhole easily generated in cylinder head castings produced by vertical casting process,its formation mechanism was explored by the MAGMA software.Based on the simulated result,the gating system of vertical casting process cylinder head castings was optimized,and a new guiding principle of gating system design was presented for the casting process.关键词：Cylinder Head;Blowhole;Temperature;MAGMA Software;Mechanism;Gating System
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发布时间：2023-12-18 - 摘要：Semi-solid A356 alloy melt was prepared and formed by squeezing casting in Archimedes spiral experiment die,and then filling ability of A356 aluminum alloy was analyzed by measuring the length of the sample spiral line.By controlling the process parameters to obtain different solid fraction and shape factor,influences of the solid fraction and shape factor on the rheological filling ability of A356 alloy melt was investigated.The results reveal that,under the same process parameters,influences of the solid fraction on the rheological filling capacity of semi-solid alloy melt is the greater than that of the shape factor.And the rheological filling ability is decreased significantly with increasing in the solid fraction,and increased with the decrease of shape factor.关键词：Semi-solid;A356Alloy;Solid Fraction;Shape Factor;Rheological Filling Ability
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发布时间：2023-12-18 - 摘要：The semi-solid squeeze casting process for 7075 aluminum alloy was simulated by the DEFORM-3Dsoftware to understand influence of plunger preheating temperature on the forming process of cup part.According to the simulated results,the squeeze casting forming of the part was carried out to analyze influence of plunger preheating temperature on the uniformity of microstructure by means of press machine and cup mould.The results show that the filling stability is improved with increasing in plunger pre-heating temperature.At 628 ℃for 50 MPa and 3.5mm/s,the segregation degree of liquid phase of cup part is decreased,and microstructure uniformity is improved increasingly with the increase of plunger preheating temperature.The minimal segregation degree is 14.02% with plunger preheating temperature at 400 ℃.关键词：Semi-solid;Rheological Squeeze Casting;7075Alloy;Uniformity of Microstructure;Liquid Phase Segregation Degree
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发布时间：2023-12-18 - 摘要：To resolve the die-casting forming performance of thin-walled magnesium alloy laptop case,some parameters,such as pouring temperature,mold temperature and injection speed,on the mechanical properties of the AZ91 Dslim laptop case were investigated by orthogonal experimental method.Experimental results show that with the pouring temperature of 700℃,mold temperature of 210℃,injection speed of 5m/s,the die castings exhibit the satisfied mechanical properties.Tensile specimen fracture was observed by SEM.The results show that the number of shrinkage holes（porosities）in the laptop case is decreased with increasing in pouring temperature.With pouring at 700 ℃,the tensile strength and yield strength of the die casting reach 242.6 MPa and 220.6 MPa,respectively.关键词：Laptop Case;Die-Casting;Casting Temperature;Mold Temperature;Injection Speed
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发布时间：2023-12-18 - 摘要：Based on the analysis of aluminum die-casting bended tube joint structure,die casting processing parameters were optimized by orthogonal test and numerical simulation.According to numerical simulation analysis of the casting process,the temperature field,filling flow condition,shrinkage position and shrinkage porosity can be presented.By orthogonal testing,the optimized process parameters are presented as follows:injection speed of 1.8m/s,mold preheating temperature of 200 ℃,pouring temperature of 660 ℃.关键词：Aluminum Alloy;Numerical Simulation;Die Casting;Tube Joint
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发布时间：2023-12-18 - 摘要：To solve the problem of casting quality,the ProCAST software was adopted to analyze the temperature field distribution during filling and solidification process.Based on the simulated results,the methods of setting up cooling pipes on the mold was put forward.The results show that the method can increase the cooling speed of wheel to obtain the satisfied casting quality and improve production efficiency.关键词：Low Pressure Die Casting;Temperature Field;Numerical Simulation;Water Cooling
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发布时间：2023-12-18 - 摘要：Casting internal defects such as shrinkage porosity,entrapped gas are mainly decided by the part structure and forming process.The solidification temperature field and hot spot distribution in connector were analyzed by the MAGMASOFT.Through reducing the wall thickness and adding the ribs,above mentioned defects in the optimized casting structure can be eliminated.Aluminum alloy was adopted to conduct die casting instead of cast iron to sand casting by optimizing connector structure.Based on calculating pouring,cooling and exhausting system of die casting process,rational die casting scheme was designed.The results reveal that the casting’s internal and external quality as well as tightness test meet the technology requirement.关键词：Die Casting;Numerical Simulation;Structure Optimization;MAGMASOFT
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发布时间：2023-12-18 - 摘要：A new Al-6.4Cu-0.4Mn medium strength aluminum alloy was investigated by optical microscope（OM）,scanning electron microscope（SEM）,transmission electron microscopy（TEM）,tensile testing and electric conductivity testing.The loading wheel hub of the alloy prepared was produced by squeezing casting and conventional casting process to analyze comparatively microstructure and mechanical properties of the alloy at different casting process.The results reveal that the solidification state of the new alloy is composed of solid phase zone,solid-liquid phase zone,liquid-solid zone and liquid zone.Microstructure of the squeezing casting new alloy consists of as-cast and deformation structure with serious inverse segregation and high level isometric crystal.Tensile test indicates that strength and elongation of the squeezing casting Al-6.4Cu-0.4Mn aluminum alloy are increased obviously after solution and aging treatment process compared with those of conventional casting process,reaching 468 MPa and16.2%,respectively.关键词：Squeezing Casting;Al-6.4Cu-0.4Mn Aluminum Alloy;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Aiming at the water-channel structure of pump body with double working cavity,it is difficult to design investment casting mould and investment process.Through analysis,investment casting process was designed for producing pump body with double working cavity,and the qualified pump body was produced successfully.关键词：Pump Body with Dual Compression Cavity;Investment Casting;Wax Pattern Making
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发布时间：2023-12-18 - 摘要：Aiming at difficulty in forming impeller with complex cavity in investment casting,process and mould design of investment casting impeller were carried out.Based on the UG software,mould design of divided-body combination of wax pattern was presented,which could make rapidly wax pattern during product process and reduce wax-making time effectively.关键词：Impeller;Wax Pattern;UG Software
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发布时间：2023-12-18 - 摘要：According to the forming theory of investment castings with complex thin-walled structure,ZTA15 hollow flange structure and casting difficulties were analyzed.The design of casting process,numerical simulation and process optimization were carried out.The results show that the simulated results can predict the location and type of defects,and shrinkage porosities（gas holes）in the upper and lower flange casting can be reduced significantly through the optimization of casting process.High-quality titanium alloy castings were obtained by improving the quality.关键词：Investment Casting;TA15;Numerical Simulation;Casting Defects
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发布时间：2023-12-18 - 摘要：The creation procedure of lost foam casting iron artwork sloth lying iron bull was described,and practical production of three artworks was carried out.The results reveal that the lost foam casting artwork has the features of simple feasibility,especially for manufacturing large and rough profile iron artwork,and the merits and dismerits were pointed out.关键词：Lost Foam Casting;Cast Iron;Artwork
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发布时间：2023-12-18 - 摘要：Mechanical properties,interface,fracture morphology and composition analysis of the Ti-Al composite plate prepared by cast-rolling method were investigated by universal testing machine,MH-3micro hardness meter,optical microscope,SEM and EDS and XRD.The results indicate that the tensile strength of Ti-Al composite plate prepared by cast-rolling method reaches 172.3MPa,which is the greater than the theoretical value of 135.6 MPa.Micro hardness of the interface layer is between the two metals,and mico-hardness in partial zone reaches 450 HV due to generating TiAl3 phase.The interface layer exhibits flat-straight structure,which is formed mainly metallurgical bonding layer by diffusion,and there exists a small amount of intermetallic compound TiAl3 generated in partial zone.There is a phenomenon of warping and separation when the composite plate is stretched,and the fracture of the two metals is characterized by ductile fracture.关键词：Cast-rolling Method;Ti/Al Composite Plate;Microstructure;Interface Layer
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发布时间：2023-12-18 - 摘要：A solder joint of 304L/Cu-Sn/Cu was brazed in furnace,and microstructure and mechanical properties of the brazed joint were analyzed and evaluated by OM,SEM,micro-hardness tester,tensile tester and fatigue tester.The results show that tightness of the joint exhibits desirable,and continuous strip structure can be observed at the junction of stainless steel and solder,which is composed of ferritic phase steel.The net-like intermetallic compound Cu31Sn8 attached ferritic stainless steel is grown to inside,and some bulk of intermetallic compound presents in the junction of ferritic stainless steel and Cu31Sn8,which may be Fe（Cr）P compound.Hardness of copper near the joint is decreased significantly,while the hardness change of 304 Lcan be ignored after brazed.Copper is cracked at place away from solder joint during tensile testing,where tensile strength of the joint reaches 240 MPa.After experienced about 50 million times cyclic load with 37 MPa stress amplitude,there is no crack in the specimen,which reveals that the brazed joint has excellent mechanical properties.关键词：Stainless Steel;Copper;Cu-Sn Solder;Furnace Brazing
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发布时间：2023-12-18 - 摘要：The CrxCuFe2Mo0.5Nb0.5Ni2（x=0,0.5,1.0,2.0）high entropy alloys were prepared by arc melting process.The corrosion resistance of these alloys and S304 stainless steel was analyzed by means of immersion and electrochemical polarization tests in 1 mol/L H2SO4 solution.The results show that the immersion corrosion rate of alloys with x=1.0and x=2.0is about 0.07mm/y and far below that of alloy with x=0and x=0.5and S304 alloys,which show that the alloys with x=1.0and x=2.0have a relatively descrable acid-resistance.The corrosion type of alloys with x=0and x=0.5exhibit mainly intergranular corrosion,while the corrosion surfaces of alloys with x=1.0and x=2.0are slight and the corrosion types are primarily uniform corrosion and pitting corrosion.The Cu,Nb,Mo elements in the alloys with x=0and x=0.5has a serious segregation,while the alloying elements are distributed homogeneously in the alloys with x=1.0and x=2.0.Therefore,the alloys with x=1.0and x=2.0have a better corrosion resistance than that of other alloys because of the slightly galvanic cell corrosion.Electrochemical polarization tests show that the alloy with x=2.0has the desirable acid-resistance among these alloys.The average corrosion rate of alloy with x=2.0is about 0.02mm/y,which is only about4% of the average corrosion of S304 stainless steel.关键词：High Entropy Alloy;Immersion Test;Corrosion Resistance;Segregation
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发布时间：2023-12-18 - 摘要：The effects of ultrasonic power on microstructure and mechanical properties of the Mg93Zn6Y alloy were investigated.The results show that the primaryα-Mg and icosahedral phase（I-phase）in the Mg93Zn6Y alloy can be refined by ultrasonic treatment.With increasing in ultrasonic power,the primaryα-Mg and I-phase are further refined.The morphology of primaryα-Mg is modified from developed dendrite to fine rosette structure.Moreover,the morphology of I-phase is transformed from continuous bulk skeletal structure to almost discontinuous net shape and particle.The tensile strength and elongation of Mg93Zn6Y alloy treated by ultrasonic treatment at 600 Wreach 215MPa and 3.1%,which are increased by 51%and 182%,respectively,compared with those of the alloy without ultrasonic treatment.关键词：Ultrasonic Treatment;Mg93Zn6Y Alloy;Ultrasonic Power;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：Optimization of modification process for hypereutectic Al-20 Si alloy with Er was analyzed.And the orthogonal experiment with 3factors and 4levels which included modification temperature,modification time and Er content was designed to optimize modification parameters.Then,effects of single factor（content,temperature and time）on microstructure and compressive strength of hypereutectic Al-Si alloy were analyzed.The results show that with the increase of Er content,modification temperature and time,the size of primary silicon in alloy is decreased to the stable,and the eutectic silicon shape is converted from needle to short rod and then to needle too,meanwhile,the compression strength is increased to the peak value and then decreased.With modification treatment at 730 ℃ for 25 min and0.8% rare earth Er addition,the primary silicon size is approximately 50μm,and the eutectic silicon exhibits short rod,meanwhile,the compressive strength reaches 492.6 MPa.关键词：Hypereutectic Al-Si Alloy;Rare Earth Er;Microstructure;Compressive Strength
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发布时间：2023-12-18 - 摘要：The influences of impurity contents,Si and Fe,in the raw materials of electrolytic aluminum production such as aluminum oxide,aluminum fluoride,anode covering material and carbon anode on the liquid aluminum quality were investigated.By tracking the migration,transformation and accumulation of impurity elements,the contribution values of the four raw materials for the Si and Fe contents in liquid aluminum were calculated.The results reveal that these four kinds of raw materials can cause the increase of Si and Fe in liquid aluminum,and the maximum values reach 55.67% and 62.15%,respectively.The largest source of impurity elements comes from the alumina with fluoride,followed by anode covered material,carbon anode and aluminium fluoride.To improve the quality of liquid aluminum,several control strategies were presented,such as controlling the quality of raw materials,purifying the anode covered material,enhancing the quality of carbon anode,optimizing the processing parameters of electrolytic production.关键词：Electrolytic Aluminum;Contents of Si and Fe;Quality of Raw Material;Control Strategies
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发布时间：2023-12-18 - 摘要：The effects of Zr,ultrasonic and compound treatment of Zr and ultrasonic on solidification structure of Mg97Y2Cu1 alloy with long-period ordered structure were investigated comparatively.Meanwhile,the influences of different ultrasonic power,treating time and vibration temperature on solidifification structure of Mg97Y2Cu1 alloy with compound treatment of Zr and ultrasonic were investigated.The results show that Zr or ultrasonic can refine solidification structure of Mg97Y2Cu1 alloy significantly.Furthermore,effect of compound treatment on refinement of solidified structure exhibits desirable.Under the condition of compound treatment,when the ultrasonic power is at 0900 Wor treating time is at 0120s,with the increase of power or treating time,grain of the alloy is refined gradually.When the vibration temperature of ultrasonic is at 660730 ℃,with the decrease of vibration temperature,grain of the alloy is refined gradually.关键词：Zr;Ultrasonic;Mg97Y2Cu1 Alloy;Solidification Structure
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发布时间：2023-12-18 - 摘要：The influences of homogenization treatment on microstructure and mechanical properties of AlZn-Mg-Cu alloy refined by nano TiN/Ti were investigated by SEM,EDS,XRD and hardness test.The results show that the nano TiN/Ti can refine the grains of Al-Zn-Mg-Cu alloy significantly.Hardness of as-cast Al-Zn-Mg-Cu alloy with TiN is improved from 123（HV）to 142.3（HV）.After one-step homogenization（470℃×24h）,the secondary phases in the Al-Zn-Mg-Cu alloy dissolved more sufficiently,almost only MgZn2 phases left.After two-step homogenization（400 ℃×10h + 470 ℃×24h）,MgZn phases are precipitated in the cooling process after homogenizing treatment and distributed uniformly in the grain.关键词：Al-Zn-Mg-Cu Alloy;Nano TiN/Ti Composite Refiner;Homogenization Treatment
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发布时间：2023-12-18 - 摘要：Hot compression deformation test of Mg-13Gd-4Y-2Zn-0.5Zr alloy was conducted using a Gleeble-3500 stimulator.Based on the analysis of the microstructure and the linear fitting for curves of stress-strain,the corresponding thermal deformation constitutive relationship was established to analyze microstructure evolution.The results show that the deformation microstructure stays the as-cast homogenized microstructure morphology.With the increase of deformation temperature,time of reaching peak stress is decreased,so the difference between flow stress value and peak stress value is narrowed,and the steady state stress value is also decreased.The deformation constitutive relationship is:ε·=5.314 5×1016[sinh（0.009 717σ）]5.401 38exp（-253.927/RT）.关键词：Mg-13Gd-4Y-2Zn-0.5Zr Alloy;Peak Stress;Constitutive Relationship;Microstructure Evolution
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发布时间：2023-12-18 - 摘要：<正>据报道,特斯拉近日与美国南加州爱迪生公司签订了一项合同,将在加利福尼亚州南部建造一个20 MW的锂电池蓄电站,预计今年年底投入使用。"值得注意的是,这个蓄电站将在短短几个月内建成。"乔治华盛顿大学太阳能研究所负责人说,"今天的声明强调了电池是
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发布时间：2023-12-18
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