最新刊期
      卷 30 ， 期 11 ， 2010
      • Vol. 30, Issue 11, Pages: 981-984(2010)
        摘要：With the help of the HYSCAN Ⅱ apparatus to measure hydrogen content in every experimented melt,effects and mechanism of ultrasonic vibration with varied frequency on the degassing process of commercial pure Al（99.7% in weight）and 7050 aluminum alloy melt were investigated by introducing ultrasonic in different temperature ranges.The results reveal that hydrogen content in the melt is evidently decreased after ultrasonic treatment.Hydrogen content in the melt is increased with rising in temperature.When melt temperature is located at 660～720℃,degassing effects are increasingly improved with decreasing in temperature,however,degassing efficiency is almost independent of the melt temperature.At fixed power and temperature,degassing effects and efficiency with 15Hz are obviously superior to those with 20Hz.The ultrasonic cavitation plays an important role in generating plenty of cavitation bubbles,furthermore,frequency exhibits a decisive role in cavitation bubble growth and in diffusion of hydrogen in melt.  
        关键词：Ultrasonic Degassing;Frequency;HYSCANII Apparatus for Hydrogen Measurement;Cavitation Effects;Bubble Growth;Hydrogen Diffusion   
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      • Vol. 30, Issue 11, Pages: 984-987(2010)
        摘要：Effects of streamline defects in practically produced ZL205A alloy castings on mechanical properties,microstructure,composition and melting point of the alloy were investigated by SEM（scanning electron microscope）,EDS（energy dispersive spectrometer）and DSC.It is found that the streamline defects have a little effect on the mechanical properties of the alloy castings,and the major can meet the requirements of I grade.Crack morphology of samples with streamline defects is characterized by fine dimple hole,exhibiting acceptable toughness.The matrix alloy is mainly composed of Al solid solution,and Ti,V,Mn,Cu element as well as grey-white Al3Ti plate.Compared with those of samples without streamline defects,peak temperature of initial melting,phase and final melting of samples with streamline are increased by 13 ℃,5℃ and 6℃,respectively.  
        关键词：Streamline Defects;ZL205A Alloy;Casting;Properties   
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      • Vol. 30, Issue 11, Pages: 988-991(2010)
        摘要：The varieties and shape of impurities in AZ80 magnesium alloy were investigated by XRD,SEM and image analysis.Furthermore,in order to improve the quality,AZ80 magnesium alloy melt was purified by ultrasonic field.The results show that impurities in AZ80 magnesium alloy consist of mainly MgO which exists mainly in form of particle,block-like and long strip structure.It is also found that acceptable purification effects on AZ80 magnesium alloy with impurities can be obtained by ultrasonic treatment,which is related to ultrasonic power,treatment time and melt temperature.The desirable purification effects of the AZ80 magnesium alloy can be observed with ultrasonic treatment of 80W at 650℃ for 60s.It is deteriorated to purify AZ80 magnesium alloy with excessively high ultrasonic power or time.  
        关键词：Magnesium Alloy;Melt Purification;Ultrasonic Field;AZ80 Magnesium Alloy   
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      • Vol. 30, Issue 11, Pages: 987(2010)
        摘要：<正>世界金属统计局（WBMS）8月18日公布的数据显示,今年1-6月全球铅市供应过剩5万吨;全球锌市供应过剩17.6万吨;全球铝市供应过剩31.4万吨。同期公布的数据显示,今年1-6月全球铜  
          
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      • Vol. 30, Issue 11, Pages: 1004(2010)
        摘要：<正>日本金属经济研究协会（MERI）预测,到2014年,世界锌的需求将达到1300万吨,之后需求将停滞。这个预测是根据"中国在2014年锌需求将达到顶峰,而亚洲其他的发展中国家  
          
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        发布时间：2023-12-18
      • Vol. 30, Issue 11, Pages: 991-994(2010)
        摘要：Al-20Si alloy was prepared by electromagnetic stirring and by melt-blending combining with electromagnetic stirring,respectively.The results indicate that a segregation layer can be observed in the Al-Si alloy prepared by electromagnetic stirring,in which the size of primary Si phase is more than 60μm,while coarse primary Si segregation occurred in edge of electromagnetic stirred Al-20Si alloy can be eliminated and size of primary Si phase can be refined to less than 16μm after combination treatment of melt-blending with electromagnetic stirring,which is attributed to melt-blending promoting the electromagnetic stirring effects on Al-20Si alloy.  
        关键词：Hypereutectic Al-20Si Alloy;Primary Si Phase;Melt-blending;Electromagnetic Stirring;Refinement   
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      • Vol. 30, Issue 11, Pages: 995-996(2010)
        摘要：A composite crucible was developed for vacuum induction melting super-pure alloys by integrating the merits of low cost of fused magnesia and high stability as well as desulfurization and dephosphorization of calcareous crucible.On the basis of traditional vacuum induction melting furnace,the composite crucible can be realized by simple auxiliary tools,which can effectively decrease the cost of crucible.Impurities including oxygen,sulfur and phosphorus in the high Ni alloy can be obviously reduced with the composite crucible,greatly improving the properties of the alloy.  
        关键词：Vacuum Induction Melting;Composite Crucible;Calcareous Crucible   
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      • Vol. 30, Issue 11, Pages: 994(2010)
        摘要：<正>广西玉柴投资20亿元打造的亚洲最大的柴油机铸造生产基地进展迅速,第一条生产线2010年3月投产后,第二条生产线也将在近期投入使用。玉柴是生产柴油机的全国知名企业,2009年柴油机销量突破67万台  
          
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      • Vol. 30, Issue 11, Pages: 1006(2010)
        摘要：<正>自从省委、省政府明确提出把玉溪建成云南省铸造产业基地后,玉溪市委、市政府结合市情,及时盘点市内铸造产业家当,多次召开铸造产业发展大会,制定产业发展计划,出台了《关于加快推进铸造产业发展若干意见》  
          
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        发布时间：2023-12-18
      • Vol. 30, Issue 11, Pages: 1029(2010)
        摘要：<正>圣泉集团"快固化、高强度、环保型新一代"呋喃树脂,以其国际领先的卓越品质、国内外超强的市场竞争力、显著的环保节能、低碳等社会效益及生态效益,通过中华人民共和国科学技术部、环境保护部  
          
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        发布时间：2023-12-18
      • Vol. 30, Issue 11, Pages: 1047(2010)
        摘要：<正>2010年9月2日上午,上海轻合金精密成型国家工程研究中心有限公司、苏州益帆压铸有限公司与吉林市化工园区签约,进行铝镁合金铸件、碳纤维与金属制品融合使用项目的生产、研发工作。  
          
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        发布时间：2023-12-18
      • Vol. 30, Issue 11, Pages: 1052(2010)
        摘要：<正>看准高端装备制造的广阔市场,目前国内各大重机企业开始涉足大型铸件市场,纷纷建设或正在规划万吨以上压机,国内大型铸件始终是高端紧缺,低端过剩。大型铸件产业尤其是高端大型铸件完全属于高新技术产业  
          
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      • Vol. 30, Issue 11, Pages: 1058(2010)
        摘要：<正>本届"制博会"的各市展区中,临汾展区以"打造全国铸造基地"为主题,在这一展区中凸显出鲜明的特色。临汾展团负责人称,临汾将借助这次展会,提升与省内外、国内外的产业合作水平,加大技术创新力度  
          
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      • Vol. 30, Issue 11, Pages: 1076(2010)
        摘要：<正>2010年9月17日,由天津市奥亚机电有限公司投资25亿元的40万吨球墨铸铁管项目正式签约落户宁津。球墨铸铁管项目成功解决了浇注过程中的球墨衰退这一世界性难题,实现了铸造行业的清洁生产、环保生产。  
          
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        发布时间：2023-12-18
      • Vol. 30, Issue 11, Pages: 997-1001(2010)
        摘要：Large whole casting copper propeller was produced since 1969.However,for lack of experiences and management,propeller crack accident occurs.Origination of crack was described.Effects of casting defects,composition segregation,alloy properties and microstructure on service life of copper alloy propeller were expounded.Some countermeasures were presented to improve the quality of the product and ensure navigation safety including casting process,design and selection of materials as well as quality management.  
        关键词：Cast Copper Alloy;Propeller;Propellev-Cvack.   
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      • Vol. 30, Issue 11, Pages: 1001-1004(2010)
        摘要：Distribution of temperature field in VAR was analyzed by the ANSYS software to understand effects of remelting velocity and cooling condition on molten pool morphology in VAR process.At a given remelting velocity,temperature field in the VAR process is evolved from dynamic process into steady stage.With increasing in remelting velocity,VAR molten pool becomes wide and deep,and time reaching to steady stage becomes short.Cooling condition has only slight effects on time reaching to steady stage in VAR process and height of ingot.  
        关键词：VAR;Temperature Field;Molten Pool Morphology;Numerical Simulation;ANSYS   
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      • Vol. 30, Issue 11, Pages: 1005-1006(2010)
        摘要：Different casting processes of sand casting ductile iron electrical engine shell were visualized based on Huazhu CAE.Through predicting shrinkage porosity and shrinkage hole in the shell at different processes,optimized processing design was determined.  
        关键词：Huazhu CAE;Shrinkage Prediction;Processing Optimization   
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      • Vol. 30, Issue 11, Pages: 1007-1011(2010)
        摘要：Three-dimensional mathematical model coupling with fluid-thermal field was established for molten pool based on considering free surface between air and molten steel as two phase flow,where rotation of twin-roller was taken into account.Flow morphology,temperature distribution and solidification of liquid steel in the molten pool with adopting wedge-shaped inlet were simulated by the model.Simulated results show that two circulation flow areas exist at the top and bottom regions of the side-nozzle in the molten pool.The height of Kiss point distributes in cosine pattern similarly according to the position of inlet along the longitudinal direction.  
        关键词：Fluid-thermal Coupling;Free Surface;Molten Pool;Numerical Simulation   
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      • Vol. 30, Issue 11, Pages: 1011(2010)
        摘要：<正>由中国铸造协会主办,中国铸造协会精铸分会及宁波奉化市通达精密铸造公司承办的精铸传统工艺第二届高层论坛于2010年9月25～27日在浙江宁波举行。参加会议的有中国铸造协会秘书长张立波  
          
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      • Vol. 30, Issue 11, Pages: 1065(2010)
        摘要：<正>2010年国际铸造论坛（International Foundry Forum 2010）于9月10日至11日,在西班牙美丽的海滨城市巴塞罗那举行,中国铸造协会常务副理事长兼秘书长张立波率中国铸造精英团队一行9人参加了此次论坛。  
          
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      • Vol. 30, Issue 11, Pages: 1012-1016(2010)
        摘要：Compressive deformation behavior of as-cast and semi-solid 5083 alloy prepared by SIMA method was examined on the Gleeble 3500 thermo-simulator,meanwhile,flow characteristics of the liquid phase was also analyzed based on the compressed macromorphology and microstructure.The results show that deformation temperature and strain rate are closely related to the thermal compressive behavior of semi-solid 5083 aluminum alloy billets.With compressive deformation in semi-solid temperature range,the whole stress in as-cast billets is obviously higher than that in SIMA prepared ones,while with compressive deformation in solid temperature,flow stress curves of the two exhibit similar and there is no remarkable advantages for the semi-solid alloy.There exist three typical deformation regions for the two alloys during compressive deformation in the semi-solid temperature range.The liquid phase in the semi-solid alloy is uniformly distributed along the grain boundary,while its distribution exhibits relatively uneven in the as-cast alloy.The density and uniformity of the semi-solid 5083 alloy are superior to those of the as-cast alloy after hot compressive deformation.  
        关键词：SIMA Method;Semi-solid;5083 Alloy;Compressive Deformation;Microstructure   
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      • Vol. 30, Issue 11, Pages: 1016-1018(2010)
        摘要：Semi-solid AlSi9Mg alloy melt was prepared by the inclined cooling slope method,and rheocasting standard specimens were prepared to measure the mechanical properties.Microstructure parameters including solid fraction,grain size and shape factor of primary phase in the alloy specimens were observed by quantitative metallographic techniques.Effects of injection specific pressure on microstructure and properties of semi-solid AlSi9Mg alloy were investigated.The results show that with increasing in injection specific pressure,solid fraction of primary phase exhibits slight change,and average diameter of grain is decreased from 74.9μm to 63.5μm,and shape factor is increased from 0.61 to 0.66.Meanwhile,mechanical properties of the specimens are certainly increased,where tensile strength,hardness and impact toughness are increased by 2.7%,3.7% and 8.6%,respectively.  
        关键词：Injection Specific Pressure;Microstructure;Semi-solid;AlSi9Mg Alloy;Mechanical Properties   
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      • Vol. 30, Issue 11, Pages: 1019-1021(2010)
        摘要：Magnesium alloy standard tensile specimens was simulated by the Anycasting software to understand effects of processing parameters including pouring temperature,squeezing pressure and mould temperature on mechanical properties of the squeezing casting AZ91D magnesium alloy.Meanwhile,grain size in the alloy was observed.The results reveal that with increasing in pouring temperature or mould temperature,mechanical properties of the alloy are firstly increased and then decreased,and with increasing in squeezing force,it is gradually increased.The desirable mechanical properties,such as tensile strength of 235MPa,elongation of 4.6% and Vikers hardness of approximately 62,can be obtained in the squeezing casting AZ91 Dalloy with pouring temperature of 670 ℃ and mould temperature of 200 ℃ as well as squeezing force of 120MPa.Under-cooling rate of AZ91D alloy during solidification process is increased by pressure,which raises the cooling rate of alloy and increases the thermal conductivity,refining obviously grain size and improving mechanical properties of alloy as a result of increasing nucleation rate.  
        关键词：AnyCasting;Magnesium Alloy;Squeezing Casting;Mechanical Properties   
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      • Vol. 30, Issue 11, Pages: 1022-1025(2010)
        摘要：There exists white-crack segregation in partly differential pressure casting ZL201 Aalloy housings.Microstructure of the housing with white-crack segregation was observed,and chemical composition was examined by EDS（energy dispersive spectrometer） and XRD（X-ray diffraction）.The results reveal that segregation in the housing mainly contains Cu and Ti.The creation of segregation is attributed to difficulty in feeding at thin-thick transition location resulting in the larger thermal stress.White-crack segregation is mainly contained Cu element.Meanwhile,there exists Ti segregation zone in some location of alloy as a result of heterogeneous stirring during melting process,which is responsible for the generation of segregation too.Through improving melting process and controlling pouring process,the segregation can be effectively eliminated,including using desirable master alloy,reducing the usage of recycled alloy,strengthening stirring and rationally increasing pouring temperature as well as improving gating system.  
        关键词：ZL201A Alloy;Microstructure;Segregation;Formation Mechanism   
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      • Vol. 30, Issue 11, Pages: 1025-1026(2010)
        摘要：Inside concave formation and core-pulling are the difficult point in mould design of the castings with inside concave.The above problems can be effectively eliminated by adopting structure with dog-led cam for inside core-pulling.The mould is designed a mould to apart,in which once-parting and pouring by slit runner were used with dog-led cam for inside core-pulling and pulling part by arc-section push rod.The practical processing parameters of die castings are as follows:filling velocity of 18m/s,pouring at 670～720℃ and holding for 12s as well as injection specific pressure of 30～50MPa.  
        关键词：Dog-led Cam;Inside Core Pulling;Side Concave;Flange   
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      • Vol. 30, Issue 11, Pages: 1027-1029(2010)
        摘要：Processing parameters of low pressure casting red copper mould were investigated including mould types,design of lift pipe and low pressure casting parameters.The optimized processing parameters for low pressure casting red copper mould are as follows:filling pressure of 0.06MPa and filling velocity of 1 m/s,solidification time of 25s,pressure-applied pressure of 0.08MPa,holding time of 120s and pouring at 1150 ℃ as well as mould temperature of 150～200 ℃.  
        关键词：Low Pressure Casting;Red Copper;Mould   
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      • Vol. 30, Issue 11, Pages: 1030-1033(2010)
        摘要：Structural redesign of framework was conducted on the basis of the XGJ150-23 cross-country motorcycle from Yu’a,Co.,Ltd.Based on meeting the requirement for strength and rigidity,die casting magnesium alloy framework substituted for origination steel structure was designed,and mechanical analysis was carried out based on three given service conditions.The results reveal that the maximum stress is 59MPa and maximum displacement is 1.88mm at full loading,which is far lower than the allowable strength,meeting the requirements of safe use.  
        关键词：AZ91 Magnesium Alloy;Framework;FEM Analysis;Die Casting   
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      • Vol. 30, Issue 11, Pages: 1033-1034(2010)
        摘要：Characteristics of low pressure magnesium alloy components and casting defects often encountered in the components were described,and origination of casting defects and countermeasures were presented.Meanwhile,effects of processing parameters on properties of low pressure magnesium alloy components were analyzed.Advantages of low pressure casting in producing magnesium alloy were expounded too.  
        关键词：Magnesium Alloy;Spacecraft;Low Pressure Casting   
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      • Vol. 30, Issue 11, Pages: 1035-1036(2010)
        摘要：Technologies for sand clean of investment casting pipe and tube with bending cavity were described,focusing on operation problems in different technologies.Inner and outer strength of cavity was analyzed.To decrease the strength of pipe shell mold,silica sol shell making was introduced by coating precoated sand in cavity,which could effectively improve the strength of shell mold,eliminating the problems in sand clean.  
        关键词：Precoated Sand;Silica Sol;Investment Casting   
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      • Vol. 30, Issue 11, Pages: 1037-1040(2010)
        摘要：The Y2O3 crucible was applied for vacuum induction melting of pure Ti.Chemical composition,microstructure,mechanical properties of prepared Ti and metal/crucible contacted interface were analyzed.Some Y2O3 particle in the ingot can be observed,showing the absence of reaction of Y2O3 and pure Ti.The interaction mechanism of crucible and melt is characterized by physical erosion of the crucible by the melt and the dissolution of Y2O3 in the liquid Ti.  
        关键词：Y2O3 Crucible;Vacuum Induction Melting;Ti   
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      • Vol. 30, Issue 11, Pages: 1040-1042(2010)
        摘要：Effects of pre-aging deformation on precipitation phase in the 2519A aluminum alloy were investigated by TEM（transmission electron microscope）,tensile testing and micro-hardness measurement.The results reveal that,compared with those of un-preaged deformed alloy,the mechanical properties of 50% cold rolled alloy are greatly improved,which are attributed to pre-deformation,increasing the dislocation density in the alloy resulting in the dispersive distribution of fine precipitation phase and decreasing the numbers of precipitates on the grain boundary to reduce the total volumetric fraction of precipitation free zone at grain boundary and sub-grain boundary.  
        关键词：Pre-aging Deformation;Precipitation Hardening;Mechanical Properties;2519A Aluminum Alloy   
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      • Vol. 30, Issue 11, Pages: 1043-1045(2010)
        摘要：Melt treatment and in-situ SiC in the Al-20Si alloy were investigated by smelting Al-20Si alloy in graphite crucible and taking phosphate as modifier.The results reveal that with increasing in holding time,grain size of primary phase is gradually refined,where holding time is 0,1,3,6min,grain sizes are 18,15,12,9μm,respectively.SiC is resulted from the reaction of C atom and hypereutectic Al-Si alloy.One part of generated SiC particle in solidification process act as heterogeneous nuclei of primary Si by agglomerating around Si colony,the other is dissolved into the primary Si phase and matrix.  
        关键词：Al-20Si Alloy;Melt Treatment;In-situ;SiC   
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      • Vol. 30, Issue 11, Pages: 1045-1047(2010)
        摘要：Origination of periodical change of Si content in liquid aluminum alloy was described by analyzing Si change in A356.2 aluminum alloy melted by tower melting furnace.Comparative experiment and practical production were conducted.The results reveal that periodical change of Si content in the liquid A356.2 alloy is attributed to composition segregation of Si phase in the A356.2 ingot and special structure of tower melting furnace.Difference of Si content in melting stage and in holding stage was verified,and countermeasures were presented.  
        关键词：Tower Melting Furnace;Composition Segregation;Origination;Countermeasures   
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      • Vol. 30, Issue 11, Pages: 1048-1051(2010)
        摘要：Relationship between melting velocity and electron beam power was determined by calculating thermal balance during melting TC4 alloy by electron beam cold hearth.An mathematical model was established to describe volatilization kinetics of Al element in TC4 alloy,and final Al content in the ingot at different melting parameters including melting velocity,Al content in initial raw materials was calculated by the model.The simulated results are well in agreement with experimental ones,verifying the reliability of the model.  
        关键词：Electron Beam Cold Hearth;Al Element;Volatilization Loss;Mathematical Model   
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      • Vol. 30, Issue 11, Pages: 1052(2010)
        摘要：<正>考虑到转子冷却的需要,Y系列315以上电机都设有十几个直径为30mm左右、深300～600mm的通风孔。Y315电机铸铝转子采用低压铸造,在铸造过程中,由于分流帽放歪、铁心叠压高度不够、冲片毛刺过大  
          
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      • Vol. 30, Issue 11, Pages: 1053-1055(2010)
        摘要：Formability of AZ31 magneisum alloy sheets for complex shape components was investigated by deep drawing experiment.Effects of deep drawing processing parameters on quality of deep drawing magnesium alloy piston shell were analyzed,such as formation temperature,drawing velocity,billet heating time and lubrication condition.The results indicate that adopting forming temperature of 290～350 ℃,drawing velocity of 0.1～0.2mm/s and heating time of 5～10 min as well as MoS2+ oil as lubricant,qualified complex magnesium alloy piston shell is successfully drawn.  
        关键词：AZ31 Magnesium Alloy;Complex Shape Shell;Deep Drawing   
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      • Vol. 30, Issue 11, Pages: 1055-1058(2010)
        摘要：By using talc powder and diatomite as refractory materials,bentonite of natrium and CMC as compound deflocculant and silical sol-PMA as compound bonding agent,based on the orthogonal testing,the water-based coating for EPC aluminum castings with optimized composition was developed.The performance of the coating was examined.Practical application reveals the features of acceptable performance and low cost.  
        关键词：EPC（Expendable Pattern Casting）;Talc Powder;Diatomite;Water-based Coating   
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      • Vol. 30, Issue 11, Pages: 1059-1062(2010)
        摘要：Nano-sized SiC particles reinforced magnesium matrix composites were fabricated by mechanical stirring combining with high intensity ultrasonic treatment.Wear properties of the matrix and its nano-composites at 25～300 ℃ were examined.The results reveal that the AZ91 Dalloy and its composites undergo mild-to-severe wear regime at experimental temperature range.The transition temperature of mild-to-severe of the composites is higher than that of AZ91 Dalloy.In the mild wear regime,wear mechanism is characterized by abrasive wear and slight adhesion wear.When the temperature is beyond the critical transition value,the wear mechanism is transferred to severe adhesion wear and delamination wear with the occurrence of severe oxidation wear.  
        关键词：Magnesium Matrix Composites;Nano-particle;High Temperature Wear   
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      • Vol. 30, Issue 11, Pages: 1062-1065(2010)
        摘要：Effects of SiC particle oxidation on the wettability and interfacial bonding of SiCp/Al composites fabricated by stirring casting were analyzed based on oxidizing SiC particle at different temperatures.The results show that SiO2 oxidized layer is formed on the surface of SiC particle by oxidation treatment and reacted with the molten Al at high temperature,which improves the wettability of SiC particle with the molten Al by reducing the interface bonding energy and enhances the interfacial bonding strength.Particle with desirable bonding interface is uniformly distributed in the prepared composites.MgAl2O4,Mg2Si phase can be observed in the interface with the Al4C3 phase free.The fracture mechanism of the composites is characterized by particle crack and pull-out of particle from the matrix.  
        关键词：SiC Particle;Oxidation Treatment;SiCp/Al Composites;Interface;Wettability   
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      • Vol. 30, Issue 11, Pages: 1066-1068(2010)
        摘要：Cu-Ti3AlC2 cermets were prepared by powder metallurgical process.The composition and microstructure of the specimens were investigated by X-ray diffraction（XRD）and scanning electron microscope（SEM）.Meanwhile,effects of Ti3AlC2 content on the density,Vickers hardness,flexural strength,fracture toughness and electric conductivity of Cu-Ti3AlC2 cermets were investigated.The results show that with increasing in sintering temperature,peak position of Cu diffraction shifts to low angles as a result of Al solid solution.With increasing in Ti3AlC2 content,density and fracture toughness of the specimens are gradually decreased,and the Vickers hardness and electric conductivity are increased,while flexural strength exhibits firstly increase and then decrease.With 30% Ti3AlC2 content,the cermets exhibit desirable comprehensive properties,where Vickers hardness,flexural strength,fracture toughness and electric conductivity reach up to 1.7GPa,733MPa,9.3MPa·m1/2,1.37×106 S/m,respectively.  
        关键词：Ti3AlC2;Cu;Microstructure;Preparation;Properties   
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      • Vol. 30, Issue 11, Pages: 1068-1071(2010)
        摘要：Effects of heat treatment on microstructure and properties of Cu-0.8Cr-0.2Zr alloy were investigated by OM（optical microscope）,TEM（transmission electron microscope）and tensile testing,electrical conductivity measurements.Effects of 70% cold deformation,aging,annealing on strength of the alloy were analyzed by comparing tensile and electrical conductivity in condition of solid solution,solid solution +cold rolling+aging,solid solution+aging+cold rolling+annealling.The results show that effects of strength and electrical conductivity of the alloy after 70% cold deformation,aging and annealing are 163 MPa,177MPa,-162MPa and-15.08MS/m,21.75 MS/m,2.99MS/m,respectively.Strength and electrical conductivity of the alloy treated by solid solution +cold rolling+aging are 529MPa and 49.36MS/m,respectively,meanwhile,recystallization temperature is 520℃.  
        关键词：Cu-0.8Cr-0.2Zr Alloy;High Strength;High Conductivity;Heat Treatment   
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      • Vol. 30, Issue 11, Pages: 1072-1074(2010)
        摘要：Behavior of Bi in the free-cutting unleaded brass at different conditions and its effects on the mechanical properties of the brass were investigated in order to produce the free-cutting unleaded brass which can totally replace the leaded brass in price and performance.The results reveal that Bi phase with irregular strip or spherical particles is segregated on grain boundary of α phase,which is hardly dissolved in β phase.In addition,Bi brass can replace the Pb brass completely in performance..  
        关键词：Bi;Unleaded Brass;Mechanical Properties   
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      • Vol. 30, Issue 11, Pages: 1074-1076(2010)
        摘要：The Cu-0.92Cr alloy was prepared by thermal deformation-solid solution-thermal deformation-cold deformation-aging treatment.The hardness and electric conductivity of the Cu-0.92Cr alloy have been examined,and microstructure of the alloy with aging at 420 ℃ for 6h was observed to understand effects of aging process on microstructure and properties of Cu-0.92Cr alloy after thermal deformation.The results reveal that with increasing in aging temperature and time,hardness of the alloy is gradually decreased and electric conductivity is increased.The hardness and electric conductivity of the alloy with aging at 420℃ for 6h reach up to 130.3HB and 52.49MS/m,respectively.The Cu-0.92Cr alloy is characterized by uniform distribution of precipitates in Cu matrix.The precipitates are found to have the f.c.c structure with the lattice parameter of 0.424nm,and particle size is approximately 4～15nm with grain spacing approximately 10～30nm.  
        关键词：Cu-Cr Alloy;Thermal Deformation;Aging;Hardness;Electric Conductivity   
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      • Vol. 30, Issue 11, Pages: 1077-1078(2010)
        摘要：<正>黄河铁牛（见下页）唐开元十二年（724年）铸铁铁牛长3.3m,高2.5m。1988-1989年于山西永济出土唐开元年间曾在黄河上建闻名于世的蒲津桥。于黄河两岸"各造铁牛四及前后铁柱三十六,铁人亦四。"  
          
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      • Vol. 30, Issue 11, Pages: 1079(2010)
        摘要：<正>20101101黄重铨,邱锡荣,庞大成.电铸Fresnel塑料镜片模具的制造.铸造工程学刊,2009,35（4）:25-30.探讨并建立一套成熟且稳定的微电铸模具成型技术,而试验所采用的母模为PVC Fresnel塑料镜片。  
          
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      • Vol. 30, Issue 11, Pages: 1080(2010)
        摘要：<正>20101101一种阀控密封铅酸蓄电池铸焊机,CN201002129,2008.01.09,江苏理士科技有限公司.本实用新型提供一种阀控密封铅酸蓄电池铸焊机。它包括由旋转气缸、联动转盘、联动曲臂、联动臂  
          
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