最新刊期
      卷 35 ， 期 2 ， 2015
      • Liu Zheng,Zhou Xiangyu,Zhu Tao
        Vol. 35, Issue 2, Pages: 113-118(2015) DOI: 10.15980/j.tzzz.2015.02.001
        摘要：The semi-solid 6061 Al alloy slurry was prepared by low superheat pouring and electromagnetic stirring,and effects of pouring temperature and electromagnetic stirring on microstructure of semi-solid6061 Al alloy were investigated.The results indicate that the pouring temperature plays a dominant role in the microstructure in the alloy,in which the fine grain in the semi-solid alloy can be obtained with pouring at 660 ℃.Morphology and size of grain of microstructure in the semi-solid alloy are effectively improved by electromagnetic stirring.The desirable morphology and size of microstructure in the semisolid alloy are presented with electromagnetic frequency of 30 Hz and stirring time of 15 s.The rational processing parameters for preparing slurry of semi-solid 6061 Al alloy were presented.  
        关键词：Semi-solid;6061Al Alloy;Pouring Temperature;Electromagnetic Stirring   
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      • Long Wenyuan,Xiong Wei,Yao Junping
        Vol. 35, Issue 2, Pages: 119-123(2015) DOI: 10.15980/j.tzzz.2015.02.002
        摘要：CNTs/Nb-20 Si composites with 1%,2%and 3% CNTs addition were prepared at 1 500℃and150 ℃/min by spark plasma sintering（SPS）,and effects of CNTs content on microstructures and properties of Nb/Nb5Si3 in situ composites were investigated.The results show that the in-situ composites consist of Nb,α-Nb5Si3andγ-Nb5Si3 phase.With CNTs content addition more than 2%,the new phase Nb4C3 can be observed in the composites,which may be attributed to CNTs structure being destroyed in a ball or sintering process to take place the chemical reaction.At the same sintering process parameters,the densities of the composites are decreased obviously with the increase of CNTs content.The maximum hardness（HRC）66of the composites prepared can be presented with 2%addition of CNTs.However,with CNTs addition more than 2%,the relative densities and hardness are decreased as a result of poor interfacial adhesion.The relative densities and hardness of the composites are increased with the increase of holding time and pressure.  
        关键词：Spark Plasma Sintering;CNTs;Nb/Nb5Si3Composites;Hardness   
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        发布时间：2023-12-18
      • Liu Weidong,Qu Hua
        Vol. 35, Issue 2, Pages: 123-126(2015) DOI: 10.15980/j.tzzz.2015.02.003
        摘要：Based on the empirical electron theory of solids and molecules（EET）,the valence electron structures（VES）of solid solution was calculated and the mechanism of alloy elements of titanium alloy was analyzed from valence electron view.It is shown that the bigger the share electron pairs nAin the strongest valence band,the more the solution strengthening effect of alloy element of solid solution.The bigger nAis,the more difficult for the strongest band to be broken up,the lower the solid phase transition temperature ofα/（α+β）.The bigger the covalence electron densityρc,the more stable solid solution,and the more the effect of alloy element onα/（α+β）phase transition,the lower the phase transition temperature.The biggerρcis,the smaller nAis,the narrower the（α+β）two-phase region of solid solution.On the contrary,with the decrease ofρc,nAis increased,so the（α+β）two-phase region is enlarged.  
        关键词：Solid Solution;Valence Electron Structure;Solution Strengthening;Phase Transition   
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      • Suo Zhongyuan,Song Yanling,Wang Xin,Jiang Feng
        Vol. 35, Issue 2, Pages: 127-129(2015) DOI: 10.15980/j.tzzz.2015.02.004
        摘要：Ti35Zr30Be27.5-xCu7.5Coxbulk amorphous alloys with xof 0,3.5,7.5,11.5were prepared by copper mold casting method.Effects of Co addition on mechanical properties of Ti-Zr based amorphous alloys were investigated using X-ray diffractometer（XRD）,universal testing machine and scanning electron microscope（SEM）.The results reveal that with appropriate substitution of Co for Be,the mechanical properties of Ti-Zr based amorphous alloys are significantly enhanced.With Co content of 3.5%,the Ti35Zr30Be24Cu7.5Co3.5bulk amorphous alloy has the highest fracture strength of 2 196 MPa and plastic strain of 4%,respectively.When the Co content is 7.5%,the fracture strength and plastic deformation rate are decreased rapidly from 2 196 MPa and 4%to 2 062 MPa and 1.5%,respectively.While increasing the Co content from 7.5%to 11.5%,the fracture strength is increased to 2 106 MPa,however the plastic deformation rate is reduced to less than 0.2%.  
        关键词：Ti-Zr Based Bulk Amorphous Alloy;Co Addition;Mechanical Properties   
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        发布时间：2023-12-18
      • Vol. 35, Issue 2, Pages: 118(2015)
        摘要：<正>LED具有节能、环保、寿命长、体积小等特点,可以广泛应用于各种指示、显示、装饰、背光源、普通照明和城市夜景等领域。但目前LED产业的持续发展仍面临技术挑战,其中LED散热是一个亟待解决的问题。LED灯对散热要求高,有70%的LED灯故障是因散热不及时引起的,LED  
          
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      • Vol. 35, Issue 2, Pages: 133(2015)
        摘要：<正>目前,宜安科技已开始批量生产非晶金属手机结构件在Iphone手机上的成功应用,使得其成为第一家能够批量制备该尺寸非晶金属结构件的公司。在美国拉斯维加斯举行的2015年国际消费类电子产品展（"CES 2015"）,中国知名的3C产品金属结构件提供  
          
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      • Vol. 35, Issue 2, Pages: 142(2015)
        摘要：<正>2014年12月26日,美国电动汽车制造商特斯拉发布了两年前停产的第一代车型Roadster的升级版,续航里程达到644km,高出原版60%。电池技术的进步,提升了特斯拉产品的性能。此前Roadster的续航里程是393km。特斯拉CEO马斯克称,特斯拉的高性  
          
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      • Vol. 35, Issue 2, Pages: 146(2015)
        摘要：<正>由于产业格局的差异,新环保法若严格实施将对国内铅锌冶炼、镍铁冶炼造成显著冲击,部分中小企业将因无法负担高昂的环保成本而退出市场,但对铜冶炼行业的影响相对较小。2014年四季度,国内有色金属行业的下游需求总体依然偏弱,有色金属价格普遍出现回调。2015年1月,我国  
          
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      • Vol. 35, Issue 2, Pages: 155(2015)
        摘要：<正>中国著名压铸设备制造商广东伊之密精密机械股份有限公司（下称"伊之密"）在海外市场捷报频传,先后收获韩国、北美地区客户的多台压铸设备订单。这标志着这家来自中国的压铸机品牌正赢得越来越多海外客户的认可。  
          
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        发布时间：2023-12-18
      • Vol. 35, Issue 2, Pages: 168(2015)
        摘要：<正>我国铸件行业的发展,离不开机械化水平的提高。要整体提高我国机械设备制造的水平,首先提高我国机器的生产技术水平,打破国外技术垄断的现状,把国际标准融入生产的每一个环节,逐步摆脱依靠进口的局面,降低铸件行  
          
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      • Vol. 35, Issue 2, Pages: 177(2015)
        摘要：<正>江西帝玛实业有限公司（"帝玛实业"）年产100万套汽车铝轮毂项目正式竣工投产。项目位于江西省抚州市宜黄县,总投资10亿元人民币,占地面积150亩,总建筑面积8万m2。据悉,帝玛实业铝轮毂项目建成投产达标后,将拥有国  
          
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      • Vol. 35, Issue 2, Pages: 183(2015)
        摘要：<正>近日,随着第一批产品40只镁合金轮毂顺利下线,河南安阳林州市300万只镁合金汽车轮毂及镁合金材料项目正式投入试生产。制造商林州市鼎鑫镁业科技有限公司表示,经过这次小批量试验,整批轮毂的性能达到了预期目标,待国家检测中心检测合格后,将马上投入批量生产。  
          
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        发布时间：2023-12-18
      • Vol. 35, Issue 2, Pages: 190(2015)
        摘要：<正>哈尔滨工业大学与哈尔滨中飞新技术股份有限公司经4年攻关,形成了一整套"高强高韧铝合金材料的加工和热处理工艺"重大科技成果,该技术达到国内领先水平。在哈工大高性能铝合金热处理方法理论研究的核心技术支持下,哈尔滨中飞新技术股份有限公司预研多年的核  
          
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      • Vol. 35, Issue 2, Pages: 201(2015)
        摘要：<正>2014年12月,中国铝合金车轮出口额3.53亿美元,出口量7.08万吨,同比分别增加11.4%,10.8%;出口单价4.99美元/公斤。截至到12月底中国铝合金车轮出口额39.67亿美元,出口量79.91万吨,同比分别增加11.0%,11.2%;出口单价4.96美元/公斤,出口厂商1  
          
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      • Vol. 35, Issue 2, Pages: 207(2015)
        摘要：<正>近年来,我国的铝合金压铸件产量不断上升,产业发展十分迅速,这主要得益于我国国内的铸造行业可快速发展,而我国的铸造行业也开始受到国外企业的认可与称赞。全球压铸行业的发展,其生产重心逐步向中国转移,在  
          
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      • Vol. 35, Issue 2, Pages: 211(2015)
        摘要：<正>2015年1月19日,中信戴卡公司与西门子公司于中信戴卡产业园区举行战略合作签约仪式,实现了国有企业与跨国公司的一次机遇性合作。此次合作基于中信戴卡的智能化制造战略,双方将在汽车零部件行业的数字化制造领域建立战略合作伙伴关  
          
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      • Vol. 35, Issue 2, Pages: 214(2015)
        摘要：<正>浙江跃岭股份有限公司使用募集资金投资建设的"年产230万件铸旋汽车铝合金车轮项目"厂房近日通过验收,生产设备、环保设施等已符合试生产条件,温岭市环境保护局同意该项目开始试生产。  
          
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      • Vol. 35, Issue 2, Pages: 218(2015)
        摘要：<正>2014年,我国10种有色金属产量为4 417万t,同比增长7.2%,增速回落2.7%。其中,精炼铜、原铝、铅、锌产量分别为796万t、2 438万t、422万t、583万t,分别同比增长13.8%、7.7%、-5.5%、7%,其中原铝增幅回落2%。  
          
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      • Vol. 35, Issue 2, Pages: 126(2015)
        摘要：<正>德国库卡（Kuka）收购徕斯（Reis）:库卡（Kuka）购买51%徕斯（Reis）股份。收购完成后,原公司唯一的所有者Reis家族将持有49%的股份。新时达并购众为兴:上海新时达电气股份有限公司拟通过非公开发行股份和支付6亿元现金相结合的方式购买深圳众为兴技术股份有限公司100%股份。  
          
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      • Vol. 35, Issue 2, Pages: 171(2015)
        摘要：<正>近日,印度商工部公布了历时两年之久的对华铝轮毂反倾销案的终裁结果。对中国企业的裁决税率分两档:浙江今飞凯达轮毂股份有限公司等7家企业的税率是1.37美元/公斤,其他企业是2.15美元/公斤。  
          
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      • Vol. 35, Issue 2, Pages: 194(2015)
        摘要：<正>展会时间:2015年10月5日7日,展会地点:美国印第安纳波利斯展览中心,组委会:北美压铸协会2015年美国压铸展（DIECASTINGCONGRESS&EXOSITION）是由北美压铸协会举办的每年一届的压铸行业盛会。举办方每年仅允许专业的展商和观众前往参加。展  
          
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      • Vol. 35, Issue 2, Pages: 197(2015)
        摘要：<正>2015德国杜塞尔多夫国际铸造展（GIFA 2015）将于2015年6月1620日在德国杜塞尔多夫国际会展中心举行。该展会每四年一届,是当前世界上无论是从规模还是影响力都是首屈一指的国际性冶金、压铸及铸造行业性的  
          
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      • Liu Zhiyong,Mao Weimin,Wang Weipan,Zheng Zhikai
        Vol. 35, Issue 2, Pages: 130-133(2015) DOI: 10.15980/j.tzzz.2015.02.005
        摘要：The semi-solid slurry of A380 aluminum alloy was prepared by a water cooling copper serpentine pouring channel,and influences of pouring temperature,the number of curves and the flow of cooling water on the microstructure of semi-solid A380 aluminum alloy slurry were investigated.The results demonstrate that grain size of the primaryα-Al is decreased and its shape factor is increased with the decrease of pouring temperature.Satisfied semi-solid slurry was prepared with pouring at 610 ℃ to 630℃.With the increase of number of curves,the primaryα-Al grain size in the semi-solid slurry can be refined with more homogeneous distribution and spheroidization.When the flow of cooling water reaches500L/h,the microstructure of semi-solid slurry become finer and more spherical.  
        关键词：A380Aluminum Alloy;Serpentine Channel;Semi-solid Slurry;Primaryα-Al   
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      • Zhao Junwen,Li Wei,Luo Qinglai,Han Jing,Dai Guangze
        Vol. 35, Issue 2, Pages: 134-137(2015) DOI: 10.15980/j.tzzz.2015.02.006
        摘要：Effects of grain refiner on microstructure and radial homogeneity of large-volume semisolid slurry of 7A04 alloy were investigated.The results indicate that 7A04 alloy semi-solid slurry with average equivalent diameter of 46μm and shape factor of 0.63 as well as improved homogeneity can be prepared by adding grain refining element Zr,Sc.Large-volume 7A04 aluminum alloy slurry with coefficient of variation of 4.6% under 631 ℃ can be obtained with addition of grain refiner.With the decrease of the temperature,the homogeneity of 7A04 aluminum alloy slurry microstructure can be deteriorated,however,the change of roundness can be ignored.  
        关键词：7A04 Aluminum Alloy;Large-volume;Homogeneity;Grain Refiner   
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      • Li Baozeng,Zhang Hongjun,Han Lijuan,Hao Liucheng,Lin Shengjun,Yuan Duanpeng,Zhang Yingjie
        Vol. 35, Issue 2, Pages: 137-139(2015) DOI: 10.15980/j.tzzz.2015.02.007
        摘要：Cu-0.8Cr-0.2Zr alloy containing Zr was prepared by internal oxidation method,and microstructure and properties of the alloy prepared were investigated.The experimental results indicate that the alloy maintains face centered cubic（FCC）lattice,and Zr-containing precipitates are dispersedly distributed in the matrix uniformly,so the alloy exhibits excellent performance.The hardness（HV）and the tensile strength of the alloy reach up to 141,430 MPa,respectively,while the electric conductivity reaches 43.5 MS/m with the softening temperature of 550 ℃.  
        关键词：Cu-Cr-Zr Alloy;Contact Materials;Microstructure;Properties   
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      • Zhang Shichang,Wu Fanggang,Mei Qiuping,Zhou Zhou,Gong Mengcheng
        Vol. 35, Issue 2, Pages: 140-142(2015) DOI: 10.15980/j.tzzz.2015.02.008
        摘要：Several typical models for predicting the solidified grain size were described.The grain size was calculated according to the relative grain size model（RGS）and Stjohn D H and Qian M model,and the prediction results were compared with those of casting AZ61 and AZ91magnesium alloys in permanent mould.The results reveal that the calculated RGScan represent the trend of relative grain size changes with Al contents,where RGSis decreased with increasing in Al contents.Stjohn D H and Qian M model can predict the actual grain size correctly.  
        关键词：Solidified Grain Size;Mathematic Model;Mg-Al Casting Alloys   
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      • Cao Xibiao,Zhao Jie,Zhang Minhong,Chang Liang,Fan Jinhui,Hua Qin,Shao Guangjie
        Vol. 35, Issue 2, Pages: 143-146(2015) DOI: 10.15980/j.tzzz.2015.02.009
        摘要：Pouring position and processing parameters including pouring temperature,die temperature and pouring time have important effects on the quality of metallic gravity casting aluminum alloy cylinder head.Through adjusting and optimizing processing parameters,the qualified rate of aluminum alloy cylinder head can be improved in gravity mould casting.MAGMA software was adopted for simulating the casting process of aluminum alloy cylinders in gravity mould casting.By comparing with top gating system and bottom gating system,and three factors to three level orthogonal test for pouring temperature,die temperature and pouring time,the casting processing parameters of aluminum alloy cylinders were optimized.Based on the optimized processing parameters,qualified rate of aluminum alloy cylinder head reaches 98%.  
        关键词：Aluminum Alloy;Cylinder Head;Casting Processes;Numerical Simulation   
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        发布时间：2023-12-18
      • Zhang Xun,Wang Shuqing,Liu Xiaofei,Dan Ting,Li Cunliang,Huang Yanjun,Geng Zhigang,Li Lei
        Vol. 35, Issue 2, Pages: 147-149(2015) DOI: 10.15980/j.tzzz.2015.02.010
        摘要：Effects of solid solution process on microstructure and mechanical properties of 7055 aluminum alloy were investigated by microstructure analysis,mechanical testing,TEM（transmission electron microscopy）and XRD（X-ray diffraction）.The results show that discontinuous distribution and coarse second phase particles are observed in the grain boundaries of the alloy,however,the major second phase particles in the grain are re-dissolved at 470℃.With increasing temperature to 480℃,the grain coarseness and obvious over-burning characteristics can be observed.Considering both strength and elongation of the alloy,the desirable solution temperature for the alloy is 470℃,where the strength and elongation of the alloy reach 460 MPa and 29.5%,respectively.  
        关键词：7055Aluminum Alloy;Solid Solution Process;Microstructure;Mechanical Properties   
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        发布时间：2023-12-18
      • Song Liang,Zhang Yilin,Yan Ruhui,Wang Haitao
        Vol. 35, Issue 2, Pages: 150-152(2015) DOI: 10.15980/j.tzzz.2015.02.011
        摘要：Mould for ZL109 aluminum alloy piston for diesel engine was optimized by simulating filling flow field,temperature field and shrinkage holes（porosity）.The numerical simulation results show that the optimized mould exhibits reasonable,in which the filling flow is stable with temperature uniform distribution,and the predictable shrinkage holes（porosity）are located in the riser.The casting quality is improved obviously by production verification,saving cost and improving the product quality.  
        关键词：Aluminum Alloy Piston;Mould;Numerical Simulation   
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      • Zhang Yi,Huang Fang,Liao Xingyin
        Vol. 35, Issue 2, Pages: 153-155(2015) DOI: 10.15980/j.tzzz.2015.02.012
        摘要：Diffuser is an important parts of containment spray pump,which is produced with low carbon martensite stainless steel.Aiming at the structural characteristics and material properties,design of the initial process was conducted.However,shrinkage porosity（holes）defects were observed in the actual product.Combined with its material properties and structural analysis,origination of defects was analyzed.The processing system was optimized by Huazhu CAE.The results reveal that the quality of the spray pump diffuser is improved with the decrease of scrap rate.  
        关键词：Numerical Simulation;Diffuser;Low-carbon Martensitic Stainless Steel   
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      • Dong Libo,Xia Feng,Zhang Yong,Zhang Zhiqiang
        Vol. 35, Issue 2, Pages: 156-158(2015) DOI: 10.15980/j.tzzz.2015.02.013
        摘要：The MAGMA software was used to numerically simulate and calculate the filling and solidification process of main housing of dolphin helicopter in low pressure casting and in gravity casting.Experiments were conducted to confirm the simulation results of low pressure casting.The results show that low pressure casting is beneficial for the decrease of oxidized slag inclusion and shrinkage porosity.  
        关键词：Numerical Simulation;Gating System;Low Pressure Casting;Main Housing Castings   
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      • Cui Tijing,Bai Dan,Xiao Han
        Vol. 35, Issue 2, Pages: 159-161(2015) DOI: 10.15980/j.tzzz.2015.02.014
        摘要：Semi-solid ZCuSn10 copper alloy billets were fabricated by strain induced melt activation based on cold rolling and remelting method,and effects of holding time on microstructure of semi-solid ZCuSn10 copper alloy were investigated during remelting process.The results indicate that the sample with the two passes rolling deformation to 17%is cut and remelted at 910 ℃.With the increase of the holding time from 10 min to 25 min,the average grain diameter is increases from 70.6μm to 88.0μm,and the shape factor is increased firstly and then decreased.The smallest factor can be obtained with holding for 25 min,where the semi-solid ZCuSn10 copper alloy slurry with spherical grains and uniform can be observed with the more uniform grain size and the liquid phase.The average grain diameter and the shape factor,the liquid fraction of the alloy reach 88.0μm,2.18,27.80%,respectively.  
        关键词：ZCuSn10Copper Alloy;Semi-solid;Strain Induced Melt Activated Method;Holding Time;Microstructure   
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      • Zhang Weiwei,Wan Li,Feng Yaokun,Liu Li,Wu Zhaofeng,Deng Jianming,Xu Guoqing
        Vol. 35, Issue 2, Pages: 162-163(2015) DOI: 10.15980/j.tzzz.2015.02.015
        摘要：The pressing assembly process for oil seal of engine front cover including its process requirement and principle was introduced.Then,the design of pressing machine and design of fixture,principle of inspection and controlling system were described.The results show that it is reliable and convenient for the pressing machine,meeting technology requirements.  
        关键词：Pressing and Assembly;Oil Seal;Engine Front Cover   
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      • Zhu Chao,Han Xiongwei
        Vol. 35, Issue 2, Pages: 164-166(2015) DOI: 10.15980/j.tzzz.2015.02.016
        摘要：Based on analysis of defects of zinc alloy die castings from a company by numerical simulation software,the existing problems in gating system of die casting die were expounded.Based on the simulation result,combined with the actual production,gating system was optimized.Through filling process simulation,the rationality of the modified design of the gating system was verified.  
        关键词：Zinc Alloy;Die-casting Die;Gating System;Numerical Simulation   
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      • Zhang Jing
        Vol. 35, Issue 2, Pages: 166-168(2015) DOI: 10.15980/j.tzzz.2015.02.017
        摘要：The basic elements for die casting company to develop customers and products on high level were described.The developing history of a typical die casting company from small size up to median company was expounded,and some common experiences those could be useful for median-small size enterprises were described.In addition,the general process to develop high-level products on engineering and the basic strategies to be trusted by customers were presented.  
        关键词：Die Casting Industry;High-Level Products;Development Strategy   
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      • Ye Zonglin,Li Xinglong,Zhang Nianyu,Li Fuqin,Zhang Chuanshu,Yu Yuguo
        Vol. 35, Issue 2, Pages: 169-171(2015) DOI: 10.15980/j.tzzz.2015.02.018
        摘要：Double suction stainless steel impeller was produced by investment casting according to its structure characteristics and quality requirements.In order to eliminate the casting defects such as central hub of shrinkage and blade cold shut,some measures were considered by simulating filling and solidification process through Magmasoft software to optimize gating system,including vertical casting with using both sides of high flow and fast filling and into the liquid steel at 800900 ℃,setting the exhaust riser,using internal chill or cold type shell technology.  
        关键词：Double Suction Impeller;Solidification Filling;Internal Chill;Exhaust Riser   
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      • Huang Dong,Nan Hai,Zhao Jiaqi,Zhao Peng,Li Yan
        Vol. 35, Issue 2, Pages: 172-173(2015) DOI: 10.15980/j.tzzz.2015.02.019
        摘要：To reduce cost of investment casting and to improve the percentage of qualification rate,application of three-dimension measurement in processing of investment casting was described.The processing typical samples were expounded.  
        关键词：Precision Casting;Optical 3D Measurement;Intelligent   
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      • Zhao Jingxiang,Li Tong,Wang Tuo,Wei Donghai
        Vol. 35, Issue 2, Pages: 174-175(2015) DOI: 10.15980/j.tzzz.2015.02.020
        摘要：The HT200 impeller was produced by investment casting with mid temperature wax and silica sol shell mould as well as detection of liquid metal quality intelligently.The measures,such as technical difficulties of castings,production conditions,mould design,shell making,metal melting and pouring were discussed.The high quality products were produced successfully.  
        关键词：Impeller;Silica Sol Shell Mould;Detection Intelligently;Investment Casting   
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      • Li Xinguo,Zhu Jianming,Qiu Jianjun
        Vol. 35, Issue 2, Pages: 176-177(2015) DOI: 10.15980/j.tzzz.2015.02.021
        摘要：The method,working principle,precision of the initial treatment technology of the wax-treatment were described as well as the damage on wax,treating efficiency and energy-comsuption.A new automative wax-processing equippment was developed.The practical production reveals that the developed equipment can decrease greatly the cost.  
        关键词：Middle Temperature Wax;Wax Quality;Ash;Efficiency   
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      • Wang Huan,Wang Honghong,Zhou Jianxin,Yan Jin,Nan Hai,Liao Dunming,Wang Hong,Yin Yajun,Chen Tao
        Vol. 35, Issue 2, Pages: 178-181(2015) DOI: 10.15980/j.tzzz.2015.02.022
        摘要：The filling and solidification process of a thin-walled titanium alloy were simulated by the centrifugal casting numerical simulation technology of 3Dvisualization to predict the possible shrinkage zone in the parts.The shrinkage distribution under different rotation speeds was analyzed emphatically,and the optimized speed could be presented.The results reveal that the hot spot location from the visualization is well agreement with the X-ray detection.With the rotating velocity of 150r/min,shrinkage hole size is decreased greatly,which is attributed to the increase of centrifugal forces improving the filling ability of the liquid metal to effectively decrease the shrinkage hole size and improve the defect condition.  
        关键词：Vertical Centrifugal Casting;Numerical Simulation;Shrinkage Cavity;Rotational Speed   
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      • Xu Gaolei,Yao Youfu,Luo Yuefeng
        Vol. 35, Issue 2, Pages: 181-183(2015) DOI: 10.15980/j.tzzz.2015.02.023
        摘要：Flatness control of copper strip with high width-thickness ratio during continuous extrusion was analyzed.Through design and optimization of mould and the extrusion channel,copper continuous extrusion strip is control effectively,which can realize directly cold rolling without scalping.  
        关键词：High Width-thickness Ratio;Copper Strip;Continuous Extrusion   
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      • Guo Jianlong,Hu Kuntai,Qiu Shengtao,Ma Yingchun,Wang Xuebing,Zhao Junxue
        Vol. 35, Issue 2, Pages: 184-188(2015) DOI: 10.15980/j.tzzz.2015.02.024
        摘要：The FEM model of electromagnetic-thermal coupled field was built up for 20 MnSi continuous casting square billet by using ANSYS software.The distribution of eddy current and temperature field was presented,and the simulated results were analyzed.The distribution of temperature and eddy current was visualized by simulation calculation under different induction heating parameters.In addition,influence of parameters on the induction heating was analyzed.The results show that parameters of current and frequency greatly affect the distribution of temperature and eddy current.Finally,simulation results were verified,and the simulated results were well agreement with the measured ones.  
        关键词：Induction Heating;Numerical Simulation;Continuous Casting Square Billet;ANSYS   
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        发布时间：2023-12-18
      • Shen Xuanjin
        Vol. 35, Issue 2, Pages: 188-190(2015) DOI: 10.15980/j.tzzz.2015.02.025
        摘要：To improve problems in low efficiency and poor surface quality and hostile production environment in traditional sand casting train brake shoe,the advantages and process procedure of EPC casting brake shoe with s mall batch production were described.According to the requirements of the quality and materials properties of brake-shoe,phosphorus cast iron as brake shoe material was adopted and proper EPC process was presented.The smelting casting experiment was carried out,and the product qualified rate reached more than 95% with the satisfied surface quality.The chemical composition of brake-shoe was examined,which showed the feasibility of EPC train brake shoe.  
        关键词：Lost Foam Casting;Casting Process;Melting;Testing Analysis   
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        发布时间：2023-12-18
      • Xia Mingkuang,Cheng Hefa,Huang Xiaomei,Cheng Zhaohu,Yu Kai,Du Chengxin
        Vol. 35, Issue 2, Pages: 191-194(2015) DOI: 10.15980/j.tzzz.2015.02.026
        摘要：Sip/Al composites with high volume fraction of silicon was prepared by pressure infiltration method.Then isothermal heat treatment was conducted for Sip/Al composites to improve the morphology of Si particles and interfacial bonding between Si particles and the aluminum matrix to eliminate the shrinkage defects in the composites prepared.The results indicate that the volume fraction of silicon in Sip/Al composites can reach up to 65%.After holding temperature at 570610 ℃,the Si particles in the composites can be spheroidized gradually by partially dissolving and re-precipitation process.Meanwhile,the interfacial bonding of Si particles and matrix metal is significantly improved.In addition,the infiltration defects of the composites prepared can be eliminated largely by isothermal treatment.  
        关键词：Sip/Al Composite;Microstructure;Pressure Infiltration;Heat Treatment   
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      • Zhu Zongqiang,Fu Mingxi,Li Bingding,Wu Xiaolei,Wang Chao
        Vol. 35, Issue 2, Pages: 195-197(2015) DOI: 10.15980/j.tzzz.2015.02.027
        摘要：The amorphous Fe67.5Ni1Al5Ga2P9.65C6.75B4.6Si3Sn0.5alloy was pretreated at different temperatures.Structural and thermodynamic analysis of the amorphous alloy were conducted by XRD（X-ray diffraction）and DSC.The analysis reveals that the atoms in the alloy are diffused each other then interacted among dissimilar atoms to form clusters or atomic colony by pre-annealing at a lower temperature.After pretreatment,the grain size in the amorphous alloy with partial crystallization is decreased,and the precipitation phase distribution is also more uniform.Meanwhile,crystallization treatment area is increased with more crystallization phase types.As a result,the internal structure and status of amorphous alloys become change.At a certain range,with the increase of pre-annealing temperature,crystallization area of amorphous alloy is increased with a higher crystal growth rate.  
        关键词：Pretreatment Temperature;Amorphous;Pre-annealing;Crystallization Treatment   
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      • You Jing,Wang Ruihong,Zhang Guojun
        Vol. 35, Issue 2, Pages: 198-201(2015) DOI: 10.15980/j.tzzz.2015.02.028
        摘要：Cu-0.7Cr alloys were prepared and subjected to multiaxial accumulative pressing（MAP）.Different initial microstructure was achieved at different pressing passes to investigate comparatively the effects of pressing passes（pressed microstructures）on the aging behaviors and mechanical/electrical properties of the Cu-0.7Cr alloy.The results reveal that MAP is effective in refining the grains,increasing twin content,and raising dislocation densities.In the following aging treatment,these defects can promote the precipitation of nanosized Cr particles and hence improve hardness and simultaneously enhance electrical conductivity of the Cu-0.7Cr alloys.Under five pressing passes,the Cu-0.7Cr alloys exhibit the desirable comprehensive behavior of hardness and electrical conductivity,which is increased by160% and by 20%,respectively,compared with ones without MAP.  
        关键词：Cu-0.7Cr Alloys;Multiaxial Pressing;Aging Treatment;Hardness;Electrical Conductivity   
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      • Zhang Yuxi,Chen Meiling,Yang Jun,Liu Guilin
        Vol. 35, Issue 2, Pages: 202-204(2015) DOI: 10.15980/j.tzzz.2015.02.029
        摘要：Effects of modified superfine SiC powder on microstructure and mechanical properties of the ZA27 alloy were investigated by using metallographic observation,tensile testing,SEM（scanning electron mciroscoy）and TEM（transmission electron microcopy）analysis.The results reveal that microstructure of the ZA27 alloy with modified SiC powder treatment is refined,and its mechanical properties are improved,where tensile strength and elongation are increased by 6.5%and by 16.7%,respectively.  
        关键词：Superfine SiC Powder;ZA27Alloy;Microstructure;Mechanical Properties   
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      • Ma Xiujun,Yin Jian,Dai Binyu,Yuan Ke
        Vol. 35, Issue 2, Pages: 204-207(2015) DOI: 10.15980/j.tzzz.2015.02.030
        摘要：Effects of Ni additions on the microstructure of Mg98-xGd2Nix（x=0,0.5,1.0,mole fraction）alloys were investigated using OM（optical microscope）,SEM（scanning electron microscope）,EDS（energy dispersed spectrometer）and XRD（X-ray diffraction）.The as-cast Mg98Gd2 alloy is composed of dendriteα-Mg matrix and Mg5 Gd phase.With the addition of 0.5% Ni,a new X phase instead of Mg5 Gd phase can be observed in the Mg97.5Gd2Ni0.5alloy with 27%in area fraction.With the increase of Ni addition from 0.5 % to 1.0%,the new phase structures in the Mg97Gd2Ni1 alloy can not be observed,while the area fraction of X phase is increased from 27% to 42%.During solid solution treatment at 500 ℃,with increasing in treating time,the Mg5 Gd phase in the Mg98Gd2 alloy is completely dissolved gradually.However,the Xphase in the Mg97.5Gd2Ni0.5or Mg97Gd2Ni1 alloy exhibits thermally stable with treating for 20 h.Meanwhile,the obvious growth of secondary dendrite arm spacing ofα-Mg matrix in the Mg97.5Gd2Ni0.5or Mg97Gd2Ni1 alloy is absent,which shows that the Xphase exhibits desirable thermal stability and inhibit effectively the growth of theα-Mg matrix.  
        关键词：Mg-Gd-Ni Alloy;X Phase;Microstructure   
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      • Li Fubin,Feng Zhongxue,Cao Yang,Shi Qingnan
        Vol. 35, Issue 2, Pages: 208-211(2015) DOI: 10.15980/j.tzzz.2015.02.031
        摘要：We have developed a directional solidification furnace to fabricate single crystal pure magnesium,and the characteristics of impurity phase in directional solidification single crystal pure magnesium was analyzed by SEM,EDS and software analysis.The results show that the impurity phase contains a variety of elements,and the magnesium oxide with the spherical,clusters or block is dominant in the impurity phase.Impurity phase of magnesium oxide in the sample is decreased in numbers and increased in size from the bottom to the upper.In addition,the major average diameter of magnesium oxide is lower than 1μm in pure magnesium structure.  
        关键词：Magnesium;Directional Solidification;Single Crystal;Impurity Phase   
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        发布时间：2023-12-18
      • Shen Jiali,Lu Gang,Yang Qingsong,Li Cheng,Yang Puchao
        Vol. 35, Issue 2, Pages: 212-214(2015) DOI: 10.15980/j.tzzz.2015.02.032
        摘要：Effects of ultrasonic power on relative density of the ZL114 Aalloy were analyzed by applying ultrasonic vibration in the process of ZL114 A melt.The results indicate that the ultrasonic treatment plays the remarkable role in refinement of microstructure and increase of relative density of the ZL114 A alloy.The relative density is increased to 0.998 6with the increase of ultrasonic power to 600 W.However,with further increases of the ultrasonic power,relative density of the ZL114 Aalloy is decreased gradually.The microstructure observation reveals that cavitation and acoustic streaming effect of ultrasound power can refine grain size and reduce the porosity shrinkage to improve the sound solidification microstructure of the alloy.  
        关键词：Ultrasound Casting;ZL114AAlloy;Relative Density;Solidification Microstructure   
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      • Wang Guangliang,Wang Qudong,Sui Yudong
        Vol. 35, Issue 2, Pages: 215-218(2015) DOI: 10.15980/j.tzzz.2015.02.033
        摘要：The equilibrium solidification phase diagram of Al-11.91Si-3.5Cu-1.69Ni-0.75 Mg was simulated by using phase diagram calculation software Pandat,and heating DSC curve was used to determine the distribution of endothermic peak of the alloy.The first endothermic peak occurs at 502.7 ℃,corresponding to the Al2 Cu transition temperature based on analysis of the phase diagram.In order to prevent the over-burning from melting of Al2 Cu,the solid solution temperature should be lower 510℃than the beginning of the first endothermic peak.Based on the above results,a single step solution such as at495 ℃for 6h、10h、14h,was presented.The DSC results also reveal that the temperature of the first endothermic peak is increased to 522.1 ℃ after solution at 495 ℃for 2h,which is beneficial for aging treatment as a result of high solution temperature promoting high element solution.Based on the above results,the two step solution,such as at 495℃for 2hand at 515℃for 4h、8h、12h,was designed to compare with single step solid solution results.Artificial aging at 200 ℃ for all the sample after the completion of solution treatment was conducted to draw the aging curves,and tensile properties were measured under the peak-aged condition.The optimized heat treatment was presented as follows:two step solution at 495℃for 2hand at 515℃for 8hwith aging at 200℃for 4h,where the ultimate tensile strength reaches 367 MPa from 212 MPa and the elongation reaches 0.66% from 0.44% at as-cast condition.  
        关键词：Al-11.91Si-3.5Cu-1.69Ni-0.75Mg;Pandat Software;DSC;Heat Treatment   
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      • Gao Mingwei,Zhang Zhifeng,Xu Jun,Feng Jing,Gai Hongtao
        Vol. 35, Issue 2, Pages: 219-222(2015) DOI: 10.15980/j.tzzz.2015.02.034
        摘要：It is radically important to eliminate lots of defects such as unstable mechanical properties,stripes and wrinkles surface,and low production yield of 7N01 aluminum profile by achieving uniformly fine solidification structure in DC casting billets.Effects of the annular electromagnetic stirring on the solidification structure of the 7N01 alloy continuous cast billet were investigated.The results indicate that with the annular electromagnetic stirring,the grain size of the 7N01 continuous cast billet with310mm in diameter is refined to 200300μm,which is 10% of the conventional DC cast billet.Meanwhile,the grain size is decreased from 8003 200μm to 200300μm with the obvious improvement of the homogeneity of the solidification structure.At the same time,the casting defects such as the feather crystals occurs in the normal DC casting process can be eliminated.  
        关键词：Annular Electromagnetic Stirring;7N01Alloy;Grain Refinement   
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      • Wan Mingjun,Yao Junping,Zhang Lei
        Vol. 35, Issue 2, Pages: 222-224(2015) DOI: 10.15980/j.tzzz.2015.02.035
        摘要：Effects of Cu on microstructure and mechanical properties of as-cast Mg93Zn6Y1 alloy were investigated.The results show that with the addition of Cu,the microstructure of as-cast Mg93Zn6Y1 alloy is refined significantly,and the eutectic phase,such asα-Mg+ Mg3Zn6 Y phase（I-phase）+ MgZnCu phase（Laves phase）in as-cast Mg91.5Zn6Y1Cu1.5alloy,is distributed in form of continuous net-like structure in the dendrites and the grain boundary.The mechanical properties of as-cast Mg93Zn6Y1 alloy are improved with Cu addition at room temperature and elevated temperature.The tensile strength and elongation of as-cast Mg91.5Zn6Y1Cu1.5alloy at room temperature and elevated temperature reach up to 178 MPa,3.8% and 153 MPa,10.6%,respectively,compared with those of Mg93Zn6Y1 alloy,increased by10.5%,40.7% and 26.4%,49.3%,respectively.  
        关键词：Copper;Mg93Zn6Y1 Alloy;Microstructure;Mechanical Properties   
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      • Vol. 35, Issue 2, Pages: 225(2015)
          
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      • Vol. 35, Issue 2, Pages: 226(2015)
          
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