最新刊期
      卷 35 ， 期 3 ， 2015
      • Zheng Zhiqiang,Xiong Xingen,Liu Zewen,Cheng Ting,Zheng Wenjun
        Vol. 35, Issue 3, Pages: 225-228(2015) DOI: 10.15980/j.tzzz.2015.03.001
        摘要：Influences of the morphology of solid-liquid interface during the heating process were analyzed with the 20 steel and 2036 aluminum alloy as solid material and with the Al-13 Si aluminum alloy as liquid material.The experimental results show that before the solid layer of liquid alloy is solidified,the interfacial heating transferring is dependent on the characteristics of solid material.In addition,the contacted condition of solid-liquid interface plays a positive role in interfacial heating transferring effects.After the solid phase layer is solidified,the heating effect is dependent on the latent heat during solid phase layer growth.When the interface of the solid phase was melted,the melting speed of interface and latent heating exhibits a observedly role on temperature of the solid phase.  
        关键词：Semi-solid;Solid-liquid Interface;Heating Transferring Process   
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        发布时间：2023-12-18
      • Wang Zhongtang,Liu Lizhi
        Vol. 35, Issue 3, Pages: 228-231(2015) DOI: 10.15980/j.tzzz.2015.03.002
        摘要：The AZ31 magnesium alloy sheet was investigated by the isothermal combined deformation technology（ICDT）.Effects of different temperature of workpiece and the reduction rate as well as the mould temperature on the microstructure and mechanical properties of AZ31 magnesium alloy were analyzed.The results show that the magnesium alloy sheet has the desirable microstructure and mechanical properties with the workpiece temperature of 275 ℃ and the reduction rate of 29% as well as the mould temperature of 150℃,where the average grain size is 7.84μm and the hardness reach 91.99 HV,meanwhile,yield strength and tensile strength as well as elongation reach 212 MPa and 298 MPa,17.2%,respectively.  
        关键词：AZ31 Magnesium Alloy;Compound Deformation;Twin Grain;Microstructure   
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        发布时间：2023-12-18
      • Fan Zhenzhong,Wang Shengqiang,Lu Zheng,Zhang Peng,Li Hong
        Vol. 35, Issue 3, Pages: 232-236(2015) DOI: 10.15980/j.tzzz.2015.03.003
        摘要：The components optimized design and performance analysis of Al-Si-Mg based alloy were investigated systematically by the orthogonal experimental design of the four factors to three levels,combined with the JMat-Pro material simulation software.The results show that the Si element has the strongest role for the cooling rate of Al-Si-Mg based alloy during the solidification process,followed by the Fe element and Ti element,whereas the Mg element exhibits the minimal impact.Mg has the most obvious effect on the yield strength,tensile strength and hardness（HRC）of Al-Si-Mg based alloy,followed by Fe element and Ti element,Si element.The tensile strength of the alloy is increased to 337.2MPa from175.2MPa with the SDAS of the Al-Si-Mg based alloy decreased from 200μm to 20μm,where the Mg element is dominant role in the SDAS,followed by the Si element,Fe element and Ti element.After three step solid solution and the two step aging heat treatment,the average tensile strength,yield strength and elongation of Al-6.5Si-0.7Mg-0.2Fe-0.2Ti-0.1Zn-0.1Mn-0.1Cu alloy reach 371 MPa,310MPa and 5.84%,respectively,which is near to the calculation of JMat-Pro software.The structure of Si phase in the alloy at as-cast state exhibits plate-like or needle,while the morphology is converted into spheroidization ones gradually after heat treatment,and the fracture morphology is characterized by the dimple fracture.  
        关键词：Al-Si-Mg Cast Alloy;Component Design;Calculation Optimization;Mechanical Properties   
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        发布时间：2023-12-18
      • Jiang Huixue,Nagaumi Hiromi,Guo Shijie,Zou Chun,Li Yafang
        Vol. 35, Issue 3, Pages: 237-240(2015) DOI: 10.15980/j.tzzz.2015.03.004
        摘要：Al-Zn-Mg-Cu high strength alloy ingots were produced by DC（direct-chill casting）.The distribution of porosity in the cross section of the DC ingot was investigated by the precision density method（Archimeds’ principle）.The change of porosity rate in the cross section as well as in the thickness and width direction of the alloy was presented.The results show that:at the cross section of the ingot,porosity rate is increased gradually from the surface to the center of the ingot,and at thickness direction,porosity rate in the zone of 1/2width and 1/4width exhibits an overall escalating trend from the surface to the center of the ingot.Meanwhile,at width direction,from the surface to the center of the ingot,porosity rate in the zone of 1/2thickness is firstly rapidly increased and then fluctuated in a certain range,while in the zone of 1/4thickness,porosity rate is firstly increased slightly and then decreased gradually.Porosity rate is closely related with the cooling rate in the ingot.With increasing in cooling rate,the porosity rate is decreased,while porosity rate is increased near center of the ingot as a result of low cooling rate.  
        关键词：Al-Zn-Mg-Cu Alloy;DC Ingot;Porosity Distribution   
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        发布时间：2023-12-18
      • Huang Fang,Hu Min,Zhang Xuehui
        Vol. 35, Issue 3, Pages: 240-243(2015) DOI: 10.15980/j.tzzz.2015.03.005
        摘要：Based on BP neural network technology,the parameters of extrusion speed,extrusion passes and extrusion method were designed for the input layer,and the tensile strength was designed as the output layer parameter,thus BP neural network model was established for analyzing effects of ECAP strong deformation on properties of Cu-3Cr alloy.Meanwhile,experimental verification of metallurgical microstructure ovservation and SEM was carried out.The results show that the relative error between the predicted and experimental values of the tensile strength between BP neural network outputs and experimental value is less than 2% with the average prediction error of 1.4%,showing a higher prediction accuracy of the model.From the view of improving tensile strength of the alloy,the optimized ECAP process parameters for Cu-3Cr alloy were presented as follows:extrusion speed of 5mm/s,the extrusion pass of 4,and the extrusion method with rotating 180°and then entering the next pass after one squeeze.  
        关键词：BP Neural Network;Strong Deformation;Equal Channel Angular Pressing（ECAP）;Tensile Strength;Process Parameters   
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        发布时间：2023-12-18
      • Yi Guangbin,Yang Xiangjie,Peng Wenyi,Huang Yongfa,Wang Ping,Li Zhiyong
        Vol. 35, Issue 3, Pages: 244-247(2015) DOI: 10.15980/j.tzzz.2015.03.006
        摘要：The bending of ultra-thin electrolytic copper foil may be observed due to the instability of production process,which seriously affects the subsequent processing and product quality.Copper samples with 18 mm in thickness and different warping degree from the five companies were analyzed for internal stress,texture,grain size.to explore the mechanism of bending.Experimental results show that the additives SP,HEC and PEG can cause copper foil bending,which is attributed to the residual stress related with texture,twin boundaries,grain size and internal pores.The additives can result in bending by changing the textures and grain sizes of copper.The degree of bending can be enhanced with the increase of（220）texture and the decrease of grain size.  
        关键词：Electrolytic Copper Foils;Bending;Internal Stress;Additive;Texture   
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        发布时间：2023-12-18
      • Li Daquan,Wang Guangzong,Liang Xiaokang,Xu Xiaojing,Zhu Qiang
        Vol. 35, Issue 3, Pages: 248-251(2015) DOI: 10.15980/j.tzzz.2015.03.007
        摘要：Effects of different pouring temperatures such as 750,730,700,675 and 650 ℃ on microstructure evolution of metal mold casting Mg-10 Sm alloy were investigated.The results reveal that the grain size of the Mg-10 Sm alloy is significantly refined,and the microstructure is transformed from big columnar and quiaxed dentrite grains to small equiaxed grains with decreasing in the pouring temperatures.The second dendrite arm spacing（SDAS）is gradually decreased with decreasing in the pouring temperatures.Effects of pouring temperature on the eutectic volume fraction,eutectic distribution and eutectic morphology can be ignored.  
        关键词：Mg-10Sm Alloy;Pouring Temperatures;Microstructure;Eutectic Phases   
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        发布时间：2023-12-18
      • Zhang Hua,Liu Chao
        Vol. 35, Issue 3, Pages: 251-254(2015) DOI: 10.15980/j.tzzz.2015.03.008
        摘要：The orthogonal experiment table with four factors and five levels was established.Wire electrical discharge machining experiment was carried out on magnesium alloy sheet through taking processing speed and surface roughness as targets.Multivariate regression equation of wire-cutting processing speed and surface roughness model for magnesium alloy sheet was presented by SAS analysis.Meanwhile,the significance order of affecting factors on wire-cutting processing of magnesium alloy sheet was presented as follows:pulse peak current,pulse spacing and pulse width,and effects of thickness of the workpiece can be ignored on wire-cutting processing.The process parameter combination was optimized based on the best level of affecting factors.Wire cutting process of magnesium alloy sheet was forecasted with BP neural network.The error of predicted value and the actual target value was within the scope of the training error,meeting the requirements.  
        关键词：Magnesium Alloy Sheet;Wire Electrical Discharge Machining;Multivariate Regression Equa-tion;Statistical Analysis System;BP Neura   
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        发布时间：2023-12-18
      • Yang Xin,Li Zhiwei,Li Zuowei,Bian Yi,Liu Xinchao,Wang Hongwei
        Vol. 35, Issue 3, Pages: 255-257(2015) DOI: 10.15980/j.tzzz.2015.03.009
        摘要：A rapid casting method based on CAD/CAE/CAM and its application were presented.The casting process was designed rapidly with CAD technology at first,then numerical simulation and analysis with CAE technology was used to optimize and improve the casting process.Finally,the qualified mould was processed quickly with the help of patternless precise casting CNC manufacturing technology.Compared with the traditional casting method,the method can not only improve the response speed of casting,but also ensure the accuracy in size and internal quality of casting by improving the efficiency of casting process design and mould manufacturing,exhibiting a certain advantages in the development and production of single and small batch casting.  
        关键词：CAD/CAE/CAM;UG;ProCAST;Patternless Mold;Rapid Casting   
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        发布时间：2023-12-18
      • Cui Xinpeng,Zhang Chen,Fan Shixi,Nan Hai
        Vol. 35, Issue 3, Pages: 257-259(2015) DOI: 10.15980/j.tzzz.2015.03.010
        摘要：The temperature field,stress field and casting deformation of the Ti-Alloy framework castings during pouring and solidification process were simulated based on the ProCAST software.The model of the graphite mould was set as RIGID at the initial stage of the stress calculation whereas VACANT at the later stage.The simulation results reveal that the temperature of the upper and inner part of the framework castings is much lower than the one of the bottom part and the pouring gates.The bending deflection along-Yaxis was observed at two tips of the framework castings.Stress concentration was observed at the corners of the internal framework structure.The actual casting dimension measurement results are well in agreement with the simulated ones,which virified the accuracy of the simulation.  
        关键词：Numerical Simulation;Ti Alloy;Casting Deformation;Stress Concentration   
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        发布时间：2023-12-18
      • Li Pubo,Chen Tijun,Zhang Suqing,Wang Yingjun
        Vol. 35, Issue 3, Pages: 260-264(2015) DOI: 10.15980/j.tzzz.2015.03.11
        摘要：The microstructure evolution of SiCp/2024 pAl composites prepared by alloy powder cold-pressing during partial remelting was investigated,and it was compared with those of the 2024 pmatrix.Effects of heating temperature on semisolid microstructure were described.The results indicate that the microstructural evolution process can be divided into three stages:the initial rapid coarsening of the fine grains within powders,structural separation and spheroidization,final coarsening of primary particles,respectively.The separation of the microstructure of the 2024 p matrix is faster than that of the composites during partial remelting,moreover,the primary particle size of the matrix microstructure is smaller than that of the composites.However,many advantages of thixoforming can be lost if the temperature is very high.  
        关键词：Cold Pressing;Partial Remelting;Microstructural Evolution   
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        发布时间：2023-12-18
      • Xu Ning,Chiou Shiyung
        Vol. 35, Issue 3, Pages: 264-267(2015) DOI: 10.15980/j.tzzz.2015.03.012
        摘要：A356 aluminum alloy slurry was prepared by inclined tubes,and effects of some parameters,such as pouring temperature,rotating velocity and inclined angle of feeding tube,preheating temperature of mould,on microstructure of semi-solid slurry,were investigated.Through optimizing processing parameters,desirable microstructure of the A356 alloy semi-solid slurry can be prepared.  
        关键词：A356Aluminum Alloy;Semi-Solid;Process Parameters   
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        发布时间：2023-12-18
      • Li Chun,Dong Xiaogang,Yuan Xunfeng,Liu Yanfeng,Zhang Meili,Zhou Chunsheng,Li Yuandong
        Vol. 35, Issue 3, Pages: 268-271(2015) DOI: 10.15980/j.tzzz.2015.03.013
        摘要：The semi-solid billets of ZA96 magnesium alloy prepared by self-inoculation method were remelted partially,and effects of microstructure on remelting temperature and holdingl time were investigated.The result shows that with increasing in partial temperature and holding time,solid phase fraction is decreased,and the grain size and roundness are decreased firstly,and then increased.With partial temperature of 530 ℃for 20 min,the grain size,roundness and solid fraction reach 75.69μm、1.45and58%,respectively.Grain coarsening,merge of dendrite arm and grain separation are nearly completely with holding for 10 min.After 10 min,the microstructure evolution follows by the Ostwald ripening mechansim.  
        关键词：ZA96 Magnesium Alloy;Partial Remelting;Microstructure Evolution;Self-inoculation Method   
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        发布时间：2023-12-18
      • Lin Zhen,Chen Xiao,Wang Liandeng
        Vol. 35, Issue 3, Pages: 272-276(2015) DOI: 10.15980/j.tzzz.2015.03.014
        摘要：Effects of solution treatment on hardness and microstructure of semi-solid squeeze casting A319 alloy were investigated.The characteristics of solution treatment semi-solid squeeze casting A319 alloy was analyzed.The results show that compared with metallic mold casting A319 alloy,semi-solid squeezing casting A319 alloy exhibits the features of low segregation degree and high solidification rate,where eutectic Al2 Cu phase is distributed along the grain boundary,and Q-Al5Cu2Mg8Si6 phase in form of eutectic and fine strip is distributed in grain boundary.The metallic mold casting A319 alloy exhibits serious segregation and low solidification rate,where Al2 Cu phase exists in the grain boundary and the matrix in form of block or mixed structure,and Q-Al5Cu2Mg8Si6 occurs in the grain boundary and matrix in form of dense block and rod.The morphology of phase contained Cu is inhibited in solid solution process.The phase contained Cu is more easily solved,so it needs a short solid solution time,exhibiting the solid solution features.It is feasible for semi-solid squeezing casting A319 alloy with solid solution at505 ℃for 3h.  
        关键词：Semi-solid;A319Alloy;Solution Treatment;Microstructure   
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        发布时间：2023-12-18
      • Ming Yue,You Guoqiang,Chen Lei,Tong Banghua,Kong Gaoshe
        Vol. 35, Issue 3, Pages: 277-281(2015) DOI: 10.15980/j.tzzz.2015.03.015
        摘要：The filling and solidification process for the magnesium alloy motorcycle crankcase right cover were carried out with the help of the orthogonal experiment and AnyCasting 2.4software according to magnesium alloy solidification characteristics.The effects of slow injection speed,rapid injection speed,pouring temperature and mold temperature on the filling characteristics,the solidification process and shrinkage porosity defects were investigated.The results show that with the increase of the slow injection speed,filling time of liquid magnesium alloy is shortened and maximum solidification rate is increased,resulting in the deterioration of steady of the filling process.In addition,with increasing in mould temperature,the solidification time is increased.However,the influence level of the above four factors on die casting defects are similar.The defects exist in the thick wall near the thin-walled shell.According to analysis result,the optimization process was presented,and the practical sample was produced.  
        关键词：Orthogonal Experiment;Magnesium Alloy;Die Casting;Numerical Simulation   
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        发布时间：2023-12-18
      • Zhu Dezhi,Liu Chuanfa,Chen Qi,Ding xia
        Vol. 35, Issue 3, Pages: 282-284(2015) DOI: 10.15980/j.tzzz.2015.03.016
        摘要：The interfacial bonding problems between the reinforcements and matrix of MMCs was investigated.The Tif/Al composites reinforced by Ti-6Al-4Vfibers were fabricated by squeeze casting method.Microstructure and interfacial characteristics of Tif/Al composites were analyzed by means of SEM and TEM.Results show that Tif/Al composites exhibits dense with desirable bonded interfaces.A few dislocations were observed in the matrix.TiAl layer and discontinuous distributed TiAl3 phases are formed at the interfaces.The longitudinal tensile strength and the elongation of the Tif/5A06 composites reach 1 045 MPa and 5.2%,respectively.  
        关键词：MMCs;Squeeze Casting;Annealing Treatment;Interfacial Characteristics   
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        发布时间：2023-12-18
      • Vol. 35, Issue 3, Pages: 285-288(2015) DOI: 10.15980/j.tzzz.2015.03.017
        摘要：Space formula chilling exhaust valve is a new Zig-Zag vavle developed from traditional chilling exhaust valve,in which the straight-line exhaust passage is modified to be a " W" shape curve structure to increase the width of the exhaust duct and entire exhaust area.So at the same vacuum die casting parameters,the extraction efficiency is equivalent with mechanical stop vacuum valve,meanwhile the reliability is equivalent with normal chilling exhausting valve.Based on the characteristics of space formula chilling exhaust valve,the vacuum control system was developed.The results demonstrate that the space formula chilling exhaust valve has advantages of high extraction efficiency,high reliability,low maintenance cost.  
        关键词：Space Formula Chilling Exhaust Valve;Vacuum Die Casting;Vacuum Control Systems   
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        发布时间：2023-12-18
      • Tian Qiao,Tian Wangang,Zhou Jianxin,Zuo Congjun,Shen Xu,Yin Yajun
        Vol. 35, Issue 3, Pages: 288-291(2015) DOI: 10.15980/j.tzzz.2015.03.018
        摘要：By measuring the temperature of a lost foam casting ductile ladder casting during the solidification process,the actual casting cooling curves were presented.Based on reverse principle,a series of orthogonal experiments were conducted to obtain the simulation cooling curves based on casting simulation software InteCast CAE.By the method of error analysis,comparing the casting cooling curves obtained by the orthogonal experiments to the ones from actual temperature measuring experiment,the most similar casting cooling curve was adopted to determine the thermophysical parameters of the alloy.Orthogonal simulation experiment results show that,at 800 1 300 ℃,casting temperature curves obtained by reverse technology are well agreement with the actual ones,and the error is less than 5%.Using the parameters obtained by orthogonal simulation experiment and previous ones to simulate the casting defects,respectively,the simulation results of the former are more in line with the actual situation,and it is verified through the casting slice experiment.  
          
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        发布时间：2023-12-18
      • Wu Xiaojuan,Feng Wengang,Ni Wei,Tu Xiaolin
        Vol. 35, Issue 3, Pages: 292-294(2015) DOI: 10.15980/j.tzzz.2015.03.019
        摘要：A complex Ni3 Al based high temperature alloy thin-walled component was produced by investment casting.According to the structure and casting difficulties,the process adopted wax quality control method,such as filling wax,cold wax block.Meanwhile,gating system design and parameters were optimized.The sound investment casting Ni3 Al based high temperature alloy components with absence of misrun,crack and shrinkage porosities could be produced successfully with preheating at（1 100±10）℃and pouring at（1 460±10）℃,meeting the product requirement.  
        关键词：Complex Thin-walled Parts;Ni3Al Based Super Alloy;Investment Casting   
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      • Peng Ying,Chen Juanjuan,Chang Taoqi,Xie Guoyin
        Vol. 35, Issue 3, Pages: 294-296(2015) DOI: 10.15980/j.tzzz.2015.03.020
        摘要：Aiming at the crack along columnar grain boundary of high pressure turbine guide blade,solidification shrinkage mechanism of columnar crystal grain boundary in the high-temperature alloy,the component affecting hot crack tendency in casting alloy was analyzed.Meanwhile,the deformation of ceramic core at high temperature and the hindering from ceramic core to metal were expounded.The results show that the cracks at columnar crystal boundary in directional solidification process is obviously related with the structure of grain boundary,the contract inhibition of alloy,the deformation and drift of ceramic core.Through adjusting thickness of the leaf type,locating the ceramic core and adjusting components of the materials,crack along columnar grain boundary was improved greatly.  
        关键词：IC10Alloys;Directional Solidification;High Temperature Deformation;Process Optimization   
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      • Huang Wen,Pan Lei,Yang Ladao,Gao Qi
        Vol. 35, Issue 3, Pages: 297-301(2015) DOI: 10.15980/j.tzzz.2015.03.021
        摘要：Based on the theories of integrated design for conticaster,a convenient and efficient visual software for bloom caster integrated design Billetcastcad was developed with the object-oriented computer language C#.Through the input of basic design premise data,the computation of temperature field,water allocation,roller layout design and its check can be implemented,and the roller layout graph of the conticaster can also be drawn.The design results from the software are well agreement with the roller layout of casters in operation,meeting practical requirements.  
        关键词：Integrated Design;Roller Layout Design;Temperature Field;Bloom Caster   
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      • Zhang Weiqi
        Vol. 35, Issue 3, Pages: 301-303(2015) DOI: 10.15980/j.tzzz.2015.03.022
        摘要：Aiming at the problems in the hollow,break,pitting,burr and slag cold copper as well as other defects in the original tundish system design,some measures were adopted,such as optimizing tundish system and simulating flow filed in tundish and pre-heating and baking process.The results reveal that the new type filter is beneficial for the elimination of inclusion.Meanwhile,through adjusting baking characteristics,the baking process was optimized,which could greatly improve the quality of liquid copper and decreasing the defects in copper rod wire.  
        关键词：SCR Continuous Casting;Tundish System;Mathematical Model   
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        发布时间：2023-12-18
      • Jiang Chengcan,Rui Yannian,Liao Lili,Guan Miao,Shen Ming
        Vol. 35, Issue 3, Pages: 304-307(2015) DOI: 10.15980/j.tzzz.2015.03.023
        摘要：The instantaneous maximum torque of twin roll caster for lead blank production reaches 240kN·m.The spindle’s diameter can not be designed too big because of the limit of the size of the spindl e’s structure.So it can bring some serious problems such as flutter and torsion of the spindle.Based on the spindle’s diameter of twin roll caster as design variables and the spindle’s quality and reliability as optimization target,by using phototropism mechanism of plant growth,combined with the design mechanism of continuous casting machine’s spindle structure,the mathematical model was established.Using the mathematical model,the optimization design of spindle was carried out.The application verifies that the method is feasible,scientific and practical.  
        关键词：Plant Growth Algorithm;Twin Roll Caster;Optimization Design of Spindle Structure with High Torque   
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        发布时间：2023-12-18
      • Li Guokai,Zhang Peilei,Lu Yunlong,Gao Jie,Liu Xiaopeng,Yan Hua
        Vol. 35, Issue 3, Pages: 307-310(2015) DOI: 10.15980/j.tzzz.2015.03.024
        摘要：Ni-W-Si intermetallic composite coatings were prepared by laser cladding on 45 steel with NiW-Si alloy powder as raw materials.Microstructure and composition of the coatings fabricated were characterized by SEM,XRD and EDS.Effects of W content on the hardness and wear resistance of the composite coatings were investigated in condition of dry sliding at room temperature.The results indicate that the coatings prepared with high handness can be attributed to the phases such as W、W5Si3、WSi2and（Fe,Ni）solid solution（the maximum hardness reaches 1 040HV）.The hardness of the coatings is decreased and wear loss is increased with the increase of W content in coatings.  
        关键词：Coating;Laser Cladding;Microstructure;Wear   
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        发布时间：2023-12-18
      • Deng Dingshan,Wan Yuanyuan,Zhao Gaozhan,Tao Jianquan,Huang Zhiwei,Deng Tianquan,Zhao Zude
        Vol. 35, Issue 3, Pages: 311-314(2015) DOI: 10.15980/j.tzzz.2015.03.025
        摘要：Aluminum matrix insulation protective interface was prepared on stainless steel by hot-dip method,and then hot-dip stainless steel skeleton with aluminum cladding layer was embedded in AZ91 magnesium alloy by inlaid casting process.The interface morphology,growth mechanism of interface reaction and diffusion behavior of elements in steel/aluminum interface and in magnesium/aluminum/steel interface were analyzed and characterized.The results show that a closed metallurgical bonding interface is formed between stainless steel skeleton and hot-dip aluminum coating,and the growth of interface is controlled by diffusion reaction of Al and Fe elements in compound layer.The desirable metallurgical bonding can be observed between AZ91 magnesium alloy and stainless steel skeleton with Al cladding layer,and the complex interface is formed which is controlled by Al and Mg elements melting and diffusion reaction.Elements mutual diffusion phenomenon is absent between magnesium alloy and stainless steel,realizing physical isolation between magnesium alloy and stainless steel.  
        关键词：Inlaid Casting;Protection Interface;Magnesium Alloy;Element Diffusion;Stainless Steel   
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      • Zhang Dan,Qiu Keqiang,Song Xinying,Hu Zhuangqi
        Vol. 35, Issue 3, Pages: 314-317(2015) DOI: 10.15980/j.tzzz.2015.03.026
        摘要：Alloy samples of Cu47Zr46Al6Nb1 with 2,3and 5 mm in diameters were fabricated by copper mold casting method.The phase constitution,microstructure and mechanical properties of the alloys prepared were investigated by using X-ray diffraction,scanning electron microscopy and electronic testing machine.The results show that the sample with 2mm in diameter exhibits totally amorphous structure.CuZr and Cu10Zr7 phase are precipitated from the alloys with the decrease of cooling rate and the volume of Cu10Zr7 is increased with the increase of diameter.Under uniaxial compressive loading,the compressive fracture strength of the as-cast Cu47Zr46Al6Nb1 alloys with 2mm,3mm and 5mm in diameter reach 1 606、1 510 and 838 MPa,respectively,and the fracture surface is evolved from vein pattern（Φ2mm）to the coexistence of microscopic crack,pattern similar to the fracture of crystalline phase and vein pattern（Φ5 mm）.Moreover,influencing factors of precipitated Cu10Zr7 on mechanical properties and fracture surface of the alloy were described.  
        关键词：Cooling Rate;Precipitate Phase;Mechanical Properties;Fracture Microstructure   
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      • Fang Yufeng,Lu Baiping,Chen Cheng
        Vol. 35, Issue 3, Pages: 318-321(2015) DOI: 10.15980/j.tzzz.2015.03.027
        摘要：Cu-Ni-Nb-Mo alloy was prepared by vacuum arc-melting.Effects of alloy composition on microstructure,thermal conductivity and melting point of Cu-Ni-Nb-Mo alloy were analyzed.The results show that at a fixed Ni content,the precipitated phase in microstructure of the alloy prepared is increased with increasing in the content of Nb and Mo.The generation of precipitated phase can improve thermal conductivity of the alloy,however,it has a negative effect on melting point of the alloy.By orthogonal analysis,the influence order of alloying element on thermal conductivity and the melting point is presented as follows:Ni,Nb and Mo.Comprehensively considering the composition of the alloy on thermal conductivity and melting point,the optimized alloy components is Cu-15Ni-3Nb-2Mo,where thermal conductivity and melting point of the alloy reach 49.2W/（m·K）and 1 134.4℃,respectively.  
        关键词：Cu-Ni-Nb-Mo Alloy;Vacuum Arc-melting;Microstructure;Thermal Conductivity;Melting Point   
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      • Pan Yanpeng,Zhang Zhifeng,Li Bao,Gao Mingwei,Xu Jun
        Vol. 35, Issue 3, Pages: 321-324(2015) DOI: 10.15980/j.tzzz.2015.03.028
        摘要：Cast Al-6Si-3Cu-0.3Mg alloy was prepared by permanent mold at 660℃.Effects of 00.06%Sr modification on eutectic silicon morphology in as-cast and T6 treated alloy were investigated,and T6 treatment was conducted at 495℃for 8hours solid solution and water quenching and 170℃for 8hours aging.The results show that the eutectic silicon can be refined greatly with addition of 0.04%Sr,and the morphology of eutectic silicon is converted from long strip into dot or short bar under T6 condition.With the Sr content increasing to 0.06%,the volume of polygonal Sr-compounds can be increased around eutectic silicon phase,which has a negative effect on the alloy properties.  
        关键词：Al-Si-Cu-Mg Alloy;Sr Modification;T6Heat Treatment;Eutectic Silicon Particles   
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      • Chen Qiangqiang,Song Guangsheng,Xu Yong,Zhang Shihong
        Vol. 35, Issue 3, Pages: 325-329(2015) DOI: 10.15980/j.tzzz.2015.03.029
        摘要：Twinning,detwinning and their effects on mechanical properties of commercial hot-rolled AZ31 Mg alloy were investigated under three compression along rolling direction（RD）,normal direction（ND）and RD-ND at room temperature,respectively.The results show that the grain orientation is changed and there exists many distinctly parallel and lenticular twinning bands in microstructure after compression along RD.While compression along ND,no matter how much the specimens was compressed,the absence of{1012}extension twinning and any twinning microstructure can be observed,which reveals that plastic deformation is mainly dependent on slips under compression along ND.The yield stress is decreased significantly during detwinning process,and the strain needed by complete detwinning is smaller than that of twinning.  
        关键词：AZ31Magnesium;Twinning Grain;Detwinning;Mechanical Proprieties   
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      • Yang Jun,Wang Qudong,Wang Huan,Zhou Suhong,Ye Bing,Jiang Haiyan
        Vol. 35, Issue 3, Pages: 330-333(2015) DOI: 10.15980/j.tzzz.2015.03.030
        摘要：The Mg-8Gd-3Y-0.5Zr（GW83）alloy was fabricated by semi-continuous casting.The mechanical properties of peak-aged alloy at room and elevated temperatures as well as compressive creep properties at 300 ℃ were investigated.The results reveal that precipitates in grain are uniformly distributed in the alloy after solution treatment at 500 ℃ for 4hand subsequent ageing at 225 ℃ for 15 h,and the peak-aged alloy exhibits prominent mechanical properties with a tensile strength and elongation of 363 MPa and 5.8%,respectively.However,the tensile strength of T6 treated alloy is decreased with the increase of temperature,and the tensile strength is decreased sharply to 219 MPa,while the elongation is increased to 20.7% at 300℃.The peak-aged alloy also exhibits desirable creep resistance at 300℃and stresses in range of 50120 MPa.The measured creep exponent is 3.36,suggesting that dislocation sliding is the dominant creep mechanism at the test conditions  
        关键词：Semi-continuous Casting;Mg-8Gd-3Y-0.5Zr Alloy;Microstructure;Mechanical Properties;Creep Resistance Properties   
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      • Luo Zhi,Lou Zhaohui,Zheng Chengkun,Zhang Datong,Zhang Weiwen
        Vol. 35, Issue 3, Pages: 334-336(2015) DOI: 10.15980/j.tzzz.2015.03.031
        摘要：The microstructure of casting Al-5.0Cu-1.0Fe alloy with and without ultrasonic vibration treatment was observed by optical microscope,scanning electron microscope and X-ray diffraction analysis.The results show that ultrasonic vibration can greatly improve the microstructure of the alloy significantly by decreasing the second dendritic arm spacing and reducing the casting defects,such as shrinkage,porosity.With ultrasonic vibration treatment,iron-rich intermetallics in the casting alloy can be refined,meanwhile,the acicular iron-rich phases are obviously decreased and the Chinese script iron-rich phases are increased.In addition,the volume fraction ofθ-Al2 Cu phase is decreased.  
        关键词：Aluminum Alloy;Ultrasonic Vibration;Iron-rich Intermetallics   
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      • Vol. 35, Issue 3, Pages: 243-254(2015)
        摘要：<正>东泰投资同向压铸机项目新压铸机品牌"联升"面世广东东泰五金集团（"东泰集团"）已完成对同向集团压铸机项目的新一轮注资。同向集团压铸机项目亦因此由佛山南海丹灶迁入顺德五沙工业园,新址为注塑机制造商广东联升精密机械制造有限公司（"广东联升"）总部所在地。  
          
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      • Vol. 35, Issue 3, Pages: 267-271(2015)
        摘要：<正>威斯康辛精密铸造公司收购北方精密铸造公司美国威斯康星州的威斯康辛精密铸造公司已经宣布收购位于日内瓦湖的北方精密铸造公司。此次收购将两大投资铸造公司联合在一起,从而壮大了威斯康辛的市场实力。  
          
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