最新刊期
卷 30 ， 期 10 ， 2010
- 摘要：Zr50.5Al9Ni13.05Cu27.45 metallic glass matrix composites containing in-situ martensite CuZr phase were prepared by copper mould injection method to improve the deformation ability of bulk metallic glass.Microstructure,thermal behavior,compressive behavior and fracture morphology of the metallic glass composites with different diameters were analyzed by Xray diffraction（XRD）,TEM（transmission electron microscope）,DSC（differential scanning calorimetry）,material testing system and SEM（scanning electron microscope）.The results reveal that,with increasing in diameter of the alloy and decreasing in cooling rate,mechanical properties of the bulk metallic glass composites are improved as a result of particle martensite CuZr phase as secondary phase precipitated from the amorphous matrix,where compressive strength and strain reach up to approximately 2190MPa and 8%,respectively,which are attributed to numerous coherent twin boundaries in the CuZr phase effectively restraining localization propagation of shearing band and inducing the seeding and branching of multiple shearing band to delay the generation and propagation of cracks.关键词：Cooling Rate;Bulk Metallic Glass;Martensite;Composites;Twin Boundary
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发布时间：2023-12-18 - 摘要：Effects of cryogenic treatment,pre-annealing cycling treatment and cryogenic-pre-annealing cycling treatment on the microstructure and crystalline phase precipitation in Fe-based amorphous alloy were investigated by DSC（differential scanning calorimetry）,TEM（transmission electron microscope）and SEM（scanning electron microscope）.The results reveal that crystallization parameters,such as Tgand Tx,of amorphous alloy are changed by cycling treatment,and the enthalpy relaxation peak appears in the DSC testing curves.The samples pre-treated still remain to be amorphous with the precipitation of nano-crystalline phase.The pre-treatment can result in the mergence and size increase of clusters,leading to the formation of grape-like structure of cluster in amorphous alloy.Besides,different types and scales of crystalline phase precipitation are observed in the amorphous alloy pre-treated.It is believed that the pre-treatment method leads to the formation of new cluster and the mergence and growth of clusters by element diffusion,changing the crystallization thermo-dynamics and crystallization kinetics of amorphous alloy.关键词：Fe-based Amorphous Alloy;Cycling Treatment;Crystalline Phase;Cluster
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发布时间：2023-12-18 - 摘要：Microstructure evolution and phase constituent of as-cast and homogenized Al-9.1Zn-1.9Mg1.6Cu alloy were investigated by means of optical microscope（OM）,SEM（scanning electron microscope）,EDS（energy dispersive spectrometer）and XRD（X-ray diffraction）and DSC（differential scanning calorimeter）.The results reveal that a lot of nonequilibrium low-melting eutectic phase exist in the ascast microstructure of the alloy,and initial melting temperature reaches 475℃.As-cast microstructure is composed ofα-Al phase,η-MgZn2phase and minor Al7Cu2Fe phase.The alloy is totally composed ofα-Al phase after homogenized at above 460℃,which shows that the non-equilibrium low-melting eutectic phase can dissolve into the matrix entirely.Desirable effects of the alloy can be observed with homogenizing at 465℃for 24hours.关键词：Al-Zn-Mg-Cu Alloy;Homogenization;Microstructure;Phase Constituent
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发布时间：2023-12-18 - 摘要：<正>国外媒体7月28日报道,日本铝业协会（JAA）预计,到2020年,全球铝需求将达到7400万吨,约为2009年总需求量的两倍。除了制造汽车使用的铝产量和住房建筑用,铝
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发布时间：2023-12-18 - 摘要：<正>8月10日报道,日本最大铜冶炼商泛太平洋（PPC）预测,在中国持续采购以及铜矿等级下降的局面下,2011年全球铜需求将超过供给,为4年来首次。届时供应缺口可能为20万吨。同时将
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发布时间：2023-12-18 - 摘要：<正>世界金属统计局（WBMS）7月21日公布的数据显示,今年1～5月全球铅市供应过剩6.84万吨,2009年同期为小幅过剩1.27万吨;全球锌市供应过剩24.1万吨;全球锡市供应过剩0.66万
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发布时间：2023-12-18 - 摘要：<正>9月6日,在山西联合煤业有限公司万荣分公司还原车间,工人们正在加紧生产。该企业顺应循环经济发展需要,扩建1.5万吨原镁生产线,形成3万吨年生产能力,新增产值2亿元。目前,该企
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发布时间：2023-12-18 - 摘要：<正>中国铝业已经调降现货氧化铝价格7%,至每吨2650元,7月1日起生效。该公司6月份现货氧化铝售价为每吨2850元。
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发布时间：2023-12-18 - 摘要：<正>由山东常林铸业公司生产的10万件汽车发动机支架前不久由青岛港发往美国帕拉根公司,这是该公司的铸件产品首次迈出国门。目前常林公司还在积极组织生产,努力完成宝马、通用、福特、奇瑞与潍柴等国内外知
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发布时间：2023-12-18 - 摘要：<正>中国有色金属工业协会副会长尚福山在23日举行的"2010中国铜钴资源高峰论坛"上首次披露了有色金属行业"十二五"规划草案。按照规划,到2015年,十种有色金属(铜、铝、铅、锌、镍、锡、锑、
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发布时间：2023-12-18 - 摘要：Microstructure and mechanical properties of Mg-5.5Zn-1.7Nd-0.7Cd-0.5Zr magnesium alloy were investigated under different extrusion rates by optical microscope（OM）and TEM（transmission electron microscope）.It is revealed that at a defined extrusion condition,with decreasing in extrusion temperature or increasing in extrusion ratio,tensile strength and yield strength of the alloy are increasingly improved as a result of the refinement of grain size.Desirable mechanical properties of the alloy can be observed with extruding at 340℃and extrusion ratio of 16,where tensile strength,yield strength and elongation as well as average grain size reach 334MPa,300MPa and 13%,7 μm,respectively.关键词：Magnesium Alloy;Hot Extrusion Process;Microstructure;Mechanical Properties
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发布时间：2023-12-18 - 摘要：A new preparing technology of EBSD samples for AZ31magnesium alloy was put forward.Suitable technological parameters were presented,such as 15～ 20Vdirect voltage,0.1～0.5A electric current,-30～-40℃electrolytic temperature and 120～200s electrolytic time.The results show that orientation indexing ratio of the AZ31magnesium alloy EBSD sample prepared by the new technology is more than 95% by analyzing quality of Kikuchi zone and grain orientation map,while it is only 85%in the samples prepared by traditional method.Besides,the new preparing method of EBSD samples exhibits the advantages of low cost and economical behavior.关键词：EBSD;Magnesium Alloy;Orientation Indexing Rate
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发布时间：2023-12-18 - 摘要：Influences of RE element on microstructure of 7075aluminum alloy were investigated by OM（optical microscope）,EDS（energy dispersive spectrometer） and SEM（scanning electron microscope）.The results verify that when RE addition is in range of 0.2%～ 0.5%,with increasing in RE addition,as-cast grain size in the alloy exhibits firstly decreased and then increased,showing desirable refinement effects.With 0.3% RE addition,minimum grain size in the alloy can be observed,and desirable comprehensive mechanical properties can be obtained,however,with 0.5% RE addition,grain size becomes coarse and acicular enrichment phase appears,resulting in the deterioration of comprehensive mechanical properties of 7075aluminum alloy.关键词：RE;7075Aluminum Alloy;Microstructure;Refinement
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发布时间：2023-12-18 - 摘要：The boron carbide reinforced aluminum matrix composites with sound and homogeneous structure were prepared by pressureless sintering combining with pressureless infiltration method.Friction and wear behavior of the composites were analyzed by observing microstructure and wear morphology change of the composites before and after isothermal treatment.The results reveal that Al and B4C contents in the composites are evidently decreased,and Al3BC content is greatly increased with the creation of AlB2ceramic phase after isothermal treatment.Hardness of the composites after isothermal treatment is obviously increased as a result of the increase of ceramic phase,meanwhile,the composites exhibit the features of more stable frictional coefficient and smooth wear surface and minor wear volume,showing desirable wear resistance.关键词：B4C/Al;Isothermal Treatment;Microstructure;Wear Resistance
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发布时间：2023-12-18 - 摘要：<正>日本铸造协会正在申办2012年的’第13届世界精密铸造会议（WCIC）’。在试探过美国,英国,欧洲的精密铸造团体之后,已经得到了欧洲,英国的非正式承诺。待美国也承认后,便可正式决定。
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发布时间：2023-12-18 - 摘要：<正>由台湾区铸造品工业同业公会主办,中国铸造协会及香港压铸与铸造业总会协办的2010年"两岸三地铸造业合作论坛"于2010年7月23日在台北市福容大饭店隆重举行。来自大陆、台湾、香港铸造界的共计100多位代表参加论坛。以中
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发布时间：2023-12-18 - 摘要：<正>8月22日,第四届中国有色金属工业发展与人力资源开发高层论坛在江西理工大学举行,共有72家单位和113名代表参加。会上,中国有色金属工业协会会长康义作了题为《加快发展方式转
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发布时间：2023-12-18 - 摘要：Two kinds of gating system for AZ91Dmagnesium alloy instrument cover were designed.Filling and solidification of the liquid magnesium alloy in the two gating systems were visualized by the ProCAST software to predict the distribution and volumetric fraction of potential defects,such as porosity,hole and gas hole,by combining with the casting velocitytime graph of selected nodes,the velocity-vector graph of the confluence of liquid metal and the distribution of solidification time,and optimized gating system was presented.The results indicate that under the conditions of 660℃ pouring temperature,200℃initial die temperature and 2.5m/s injection velocity,the gating system with ingate setting on the maximum wall thickness is more reasonable.关键词：Numerical Simulation;Die Casting;Magnesium Alloy;Optimization of Gating System;Filling and Solidification
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发布时间：2023-12-18 - 摘要：Semi-solid A356aluminum alloy slurry was prepared by a serpentine channel,and the slurry was heated for a short time by an induction heating system and then finally quenched in water to observe effects of short-time electromagnetic heating on temperature and microstructure of the slurry.The results reveal that temperature difference between the inner slurry and periphery slurry can be decreased greatly through short-term induction heating process,reaching the range of±1℃,fulling meeting the requirements of rheo-forming.Meanwhile,primaryα-Al phase becomes more spherical with the coarseness of grain size.Heating power has some effects on microstructure of the slurry when heating power is in range of 1.6～3.6kW,with increasing in heating power,heating time is shortened and primaryα-Al phase is refined.The slurry temperature has also somewhat effects on the slurry microstructure.When the temperature is in range of 595～608℃,with decreasing in temperature,the primaryα-Al phase is refined.关键词：Semi-solid;A356Aluminum Alloy;Serpentine Channel;Induction Heating
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发布时间：2023-12-18 - 摘要：Application of ceramic shell mold in elevated alloy directional solidification was reviewed,focusing on adding mineralizer and ultrafine alumina powder with the size of less than 10μm to increase chemical reactive activity of ceramic shell mold materials to promote the formation of the mullite,and adopting discontinuous or continuous fiber to strengthen mold shell,to improve the elevated strength and creep resistance of the shell mold.In addition,thermal shocking resistance of ceramic shell mold can be improved by increasing porosity in the ceramic shell mold and forming barrier layer at the layer.Furthermore,some problems in the ceramic shell molds were pointed out.关键词：Ceramic Shell Mold;Mechanical Properties;Directional Solidification;Elevated Alloy
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发布时间：2023-12-18 - 摘要：Report on international conference of alloy and composites semi-solid forming technologies was reviewed,involving in materials development and alloy design,microstructure and properties,rheo-behavior,modeling and numerical simulation,processing development and industrial application.关键词：Alloy;Composites;Semi-solid Forming
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发布时间：2023-12-18 - 摘要：Application of easily-cutting riser in small austenite stainless steel investment castings was introduced briefly.Special tool was used to take out casting,which not only ensures the quality of the castings,but also decrease cost and increase the production efficiency.The notes in application of easily-cutting riser and taking-out tool were presented.关键词：Investment Casting;Easily-cutting Riser;Silica Sol Shell Mold
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发布时间：2023-12-18 - 摘要：Ejection of cylindrical gear needs a larger ejecting force,but the area of ring end face for push is small,which results in the easy deformation during pulling castings.The die casting die for cylindrical gear with inside and outside two ejector sleeves for pushing out parts at one time is designed to ensure non-distortion and non-mark during pushing parts.Structure characteristics and operation principle of the die were described.Claw type gate and inside-outside two ejector sleeves were adopted in the die to realize uniform exerted force and low specific pressure during pushing castings.Finally,there is no mark on the cylindrical gear castings.关键词：Die Casting Die;Ejector;Claw Type Gate;Cylindrical Gear
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发布时间：2023-12-18 - 摘要：Aiming at concrete case,origination of inadequate pressure resistance of die casting cylinder body was described combining with practical production,and countermeasures were presented.关键词：Die Casting;Defects;Inadequate Pressure Resistance;Cylinder Body;Quality
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发布时间：2023-12-18 - 摘要：Lost foam casting aluminum alloy parts is increasingly applied in automobile industry,such as engine cylinder,cylinder cover,manifold exhausted pipe with water cooling,valve,nozzle at abroad.However,lost foam casting aluminum alloy parts is slowly developed at home,which was attributed to complex processing,low equipment and raw and auxiliary materials resulting in casting defects.Origination of main defects in lost foam casting aluminum alloy parts and countermeasures were described.关键词：Aluminum Alloy;Lost Foam Casting;Defects
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发布时间：2023-12-18 - 摘要：Through comparative experiments on horizontal continuous casting cast iron,effects of convection behavior of liquid iron in the mould and gravity segregation on heterogeneity of mechanical properties of cast iron profiles along section were analyzed.The results reveal that reasonable processing parameters can promote divorced precipitation and grain refinement in microstructure of horizontal continuous casting cast iron,which is helpful for improving the homogenization of mechanical properties of the profiles along section.关键词：Horizontal Continuous Casting;Cast Iron Profile;Flow Behavior;Mechanical Properties
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发布时间：2023-12-18 - 摘要：6063aluminum alloy ingot with 100mm in diameters was prepared by out-phase magnetic filed HDC casting.Effects of out-phase magnetic field on surface quality and microstructure of HDC 6063Al aluminum alloy ingot were investigated by macro-structure observation and OM（optical microscope）analysis.It is verified that out-phase can greatly improve the surface quality of HDC 6063aluminum alloy ingot and decrease the thickness of inner structure.In addition,finer and homogeneous grain can be observed in section of HDC 6063aluminum alloy ingot as a result of obviously improving the microstructure in ingot by out-phase magnetic field.关键词：Out-phase Magnetic Field;Aluminum Alloy;HDC;As-cast Microstructure;Surface Quality
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发布时间：2023-12-18 - 摘要：The Cu-1.0Cr alloy was hot forged,solid solution-treated and cold rolled as well as subjected to aging treatment at different temperature for different time.Hardness and electrical conductivity of the alloy at different states were measured and microstructure was observed.The results reveal that at 380℃,hardness and electrical conductivity are increased with extending in aging time,while at 450℃,with extending in aging time,hardness is obviously decreased,however,electrical conductivity keeps stable.At given experimental conditions,hardness and electrical conductivity of the alloy with aging at 450℃ for 6hours reach up to 127HB and 40.08MS/m.Secondary disperoid in the Cu matrix can be observed in the alloy after thermo-mechanical treatment,which is responsible for the raise of hardness and electrical conductivity.Recrystallization appears in the alloy with increasing in aging temperature and aging time,which results in the great decrease of hardness at 450℃.关键词：Cold Deformation;Aging;Hardness;Electrical Conductivity;Recrystallization
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发布时间：2023-12-18 - 摘要：TiB2/Al-4.5Cu composites were prepared by mixed salt reaction in-situ synthesis process,and friction and wear properties of the composites were investigated.Microstructure of the composites was observed by XRD（X-ray diffraction）and SEM（scanning electron microscope）.The results reveal that in-situ TiB2particle with fine grain size in range of 0.1～1.5 μm and average size of 400nm is uniformly distributed along grain boundary,obviously refining the microstructure of the composites.Dry sliding frictional and wear experiment at room temperature shows that wear resistance of the composites is evidently superior to that of matrix alloy.Wear mechanism of matrix alloy is characterized by adhesive wear,and wear mechanism of the composites is characterized by co-action of abrasive wear with slight adhesive wear.关键词：In-situ;TiB2/Al-4Cu Composites;Friction and Wear;Microstructure
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发布时间：2023-12-18 - 摘要：Nano-sized SiC particles reinforced AZ91D composites were fabricated by ultrasonic method,and the friction and wear behavior of the as-cast composites under dry sliding condition were studied.The results indicate that compared with those of the AZ91D matrix,the composites exhibit higher hardness and wear resistance.Wear resistance of the composites is increased with the increase of volumetric fraction of SiC particles.The wear morphology of tested samples was examined with laser scanning microscope.It is found that main wear mechanim of the AZ91Dalloy is characterized by adhesive wear,while that of the composites is characterized by abrasive wear.It is supposed that the addition of nano-sized SiC particles results in the change of wear mechanism.
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发布时间：2023-12-18 - 摘要：Cu/Al composite plate for cable was fabricated by three-step compound technology,and deformation behavior of Cu/Al composite plate during rolling process was analyzed.Meanwhile,relationship of reduction of Cu layer and Al layer with total reduction was investigated at a fixed Cu layer and Al layer thickness ratio of 1:4.It is found that deformation region of Cu/Al composite plate can be divided into three zones.Thickness model of rolled compound Cu/Al composite plate was established based on initial billet thickness ratio.关键词：Cu/Al Composite Plate;Cold Rolling;Deformation Region
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发布时间：2023-12-18 - 摘要：Electrolyte concentration in micro-arc oxidation on sand-blasting magnesium alloy was optimized by orthogonal testing.Effects of component concentration on properties of micro-arc oxide film were approached,and the morphology,chemical composition and phase structure were analyzed by SEM（scanning electron microscope）,EDS（energy dispersive spectrometer）,XRD（X-ray diffraction）.The results show that optimal electrolyte concentration is as follows:15g/L Na2SiO3·7H2O,6g/L KF·H2O,9 g/LKOH,10mL/L C3H2（OH）3.Surface morphology of film inherits the sand-blasting’s ones.Oxide film consists of ceramic layer with a great deal of uniform discharge hole with diameters in range of 0.2～1.5 μm,and the phase is composed of Mg,MgO,Mg2SiO4,MgAl2O4and some arbitrary phase.关键词：Magnesium Alloy;Sand-blasting;Microarc Oxidation;Electrolyte Concentration
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发布时间：2023-12-18 - 摘要：The compression deformation of Mg-11.8Gd2.8Y-0.44Zr magnesium alloy and its microstructure were investigated on the Gleeble-1500Dhot simulator with strain rate of 0.001s-1～0.1s-1 at 300～450℃in condition of the 60%deformation rate.The relationship between flow stress and deformation temperature was analyzed.The results reveal that the steady flow stress is increased with the increase of strain rate,while the true stress is decreased with increasing in deformation temperature at a constant strain rate.Temperature about 350℃is suggested for hot deformation of the alloy.关键词：Mg-Gd-Y-Zr Magnesium Alloy;Hot Compression;Flow Stress
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发布时间：2023-12-18 - 摘要：There exists twining superplasticity in extruded-T5treated Mg-9Gd-4Y-0.6Zr alloy during tensile testing at 400℃,meanwhile,a new phenomenon is observed that a great deal of fine recrystallized grain is presented and a lot of twins occur in grains.Creation of twin grain can adjust grain orientation and release local stress concentration during deformation process,resulting in the crack free and void free in the microstructure.Deformation mechanism of the alloy at 400℃is a new superplasticity mechanism,which exhibits slipping in form of recrystallization on grain boundary and coordination in form of twin in grain.关键词：Mg-Gd-Y-Zr;Twining Superplasticity;Deformation Mechanism
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发布时间：2023-12-18 - 摘要：Effects of deformation temperature,strain rate and strain on microstructure of Ti8LC alloy were investigated by thermal simulation testing.The results indicate that microstructure and properties of the alloy are closely related to the deformation temperature.The alloy is composed of two-state structure with better comprehensive properties with temperature lower than 1000℃,while it is composed of lamellar structure with a higher strength and a lower elongation with temperature more than 1000℃.Based on considering the deformation forces during formation,strain rate of the alloy should keep a rational range.Meanwhile,with 40%～60%deformation rate,alloy exhibits acceptable properties and microstructure.关键词：Ti Alloy;Microstructure;Deformation;Parameter Optimization;Thermodynamic Simulation
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发布时间：2023-12-18 - 摘要：Existing morphology and precipitate characteristics of RE Er in as-cast,as-homogenized and cold rolled Al-4.7Mg-0.7Mn-0.1Zr-0.3Er alloy were observed by SEM（scanning electron microscope）,TEM（transmission electron microscope）.The results show that in non-equilibrium solidification condition,minor Er existed in theα-Al solid solution,while major Er is continuously or die-continuously distributed on the grain boundary in form of primary Al3Er phase.Although Er is likely to segregate with Mn and Fe,it is difficult to generate Er-Mn intermetallic compound.Solid solution Er can be precipitated from the alloy in form of sub-Al3Er phase during homogenization annealing process.In addition,continuous or dis-continuous Al3Er phase distributed on the grain boundary would not be decomposed and resolved in subsequently heat treatment,and they are broken during hot rolled or cold rolled process.The dispersely distributed Al3Er phase in the cold rolled plate exhibits desirable coherent/semi-coherent with the matrix,which could be acted as effective strengthening phase in the alloy.关键词：Er;Al-Mg-Mn-Zr Alloy;Al3Er Phase
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发布时间：2023-12-18 - 摘要：Influence of extrusion temperature and extrusion ratio on the microstructure and mechanical properties of the spray-formed alloy which was extruded on 2000kN four column hydraulic press was investigated,and fracture mechanism of extruded alloy was analyzed,meanwhile,mechanical properties of as-cast and spray-formed alloy after extrusion were comparatively analyzed.The results reveal that at an extrusion ratio of 6.25,with increasing in temperature,number of recrystallized grain in the sample are increased to involve into fine and uniform equiaxed grain at 250℃,meanwhile,hardness and tensile strength of the alloy is decreased,while elongation is increased.At a temperature of 250℃,grain size in the alloy is refined,and elongation and tensile strength are increased with increasing in extrusion ratio,however,hardness of the alloy is almost independent of the change of extrusion ratio.Fracture of extruded alloy is characterized by micro-void coalescence mode.Tensile strength and elongation of the spray-formed and extruded alloy are obviously superior to those of as-cast and extruded ones.关键词：6061Aluminum Alloy;Spray Forming;Extrusion;Microstructure and Properties;Fracture Mechanism
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发布时间：2023-12-18 - 摘要：Effects of silver,cobalt and germanium on microstructure and mechanical properties of the investment casting Be-Al alloy were investigated by tensile testing at room temperature,SEM（scanning electron microscope）observation and EDS（energy dispersive spectrometer）analysis.The results indicate that alloying element,such as Ag,Co and Ge,cannot change the microstructure of the alloy,and they strengthen the alloy as a result of strengthening aluminum alloy matrix.Compared with those of Be-Al matrix alloy,tensile strength and yield strength,elongation of the alloy with Ag,Co and Ge are greatly increased.Mechanism of alloying element strengthening alloy was analyzed theoretically.As a result,the alloying elements are beneficial not only for improving the brittleness but also for bonding the interface of Be-Al alloy.
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发布时间：2023-12-18 - 摘要：Factors influencing accuracy of aluminum alloy batching include equipment features,scale and concentration inspector systematic error,quality of raw and auxiliary materials,smelting and casting process.So it is necessary to consider and control during batching from above mentioned aspects.关键词：Batching;Influential Factors;Control
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发布时间：2023-12-18 - 摘要：<正>北京汇高（SINO-HUGE）成立于1999年2月,已历经多年市场风雨的磨练,培养了一支精于精铸的技术型、创新型、服务型的管理团队。在业界,与汇高合作过的公司,普遍对汇高满意,有较高
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发布时间：2023-12-18
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