最新刊期
      卷 31 ， 期 7 ， 2011
      • Wang Guojun1,Wang Yufeng2,Liu Keyan1,Lin Sen1,Wang Hao2,Ning Zhiliang2
        Vol. 31, Issue 7, Pages: 589-591(2011)
        摘要：Effects of deformation rate on the texture structure in 4032 large bar produced by counter extrusion were investigated by means of X′pert MRDX-ray diffraction. The results show that there exist strong <111>texture and relatively weak <100> texture in the hot extruded aluminum alloy bars.  
        关键词：4032 Aluminum Alloy;Hot Extrusion;Texture   
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        发布时间：2023-12-18
      • Ma Mingzhen1,Liu Lei1,Chen Jun1,Wang Rui1,Liu Riping1
        Vol. 31, Issue 7, Pages: 592-594(2011)
        摘要：Tungsten wire with 0.5 mm in diameter toughened Zr41Ti14Cu12.5Ni10Be22.5 bulk amorphous composites were prepared by reverse infiltration technology. Effects of infiltrated temperature on interface and compression behavior of the composites were investigated. Interface of the composites exhibit the features of mechanical bonding, co-existence of mechanical bonding and metallurgical bonding and reactive bonding, respectively, at 1 000 K, 1 100 K and 1 200 K. The bonding strength is decreased with the lower infiltrated temperature, while interface reactive product can be formed with the higher infiltrated temperature as a result of W wire melting, which is harmful for the compression strength and deformation behavior of the composites. The Wf/Zr-based bulk amorphous composites with 2 409 MPa in maximum compressive strength and 19.5% in plastic deformation can be obtained with infiltrated temperature of 1100 K for 30 min.  
        关键词：Wf/Zr Bulk Amorphous Composites;Infiltration Temperature;Interface Bonding;Compressive Behavior;Deformation Behavior   
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        发布时间：2023-12-18
      • Zhang Lijun1,Bai Yu1,Zhou Zhongbo1,Liu Di1,Wang Xingyun1,Xue Xiangyi1,Chang Hui1
        Vol. 31, Issue 7, Pages: 595-598(2011)
        摘要：New VAR process for preparing TB8 Ti alloy with high molybdenum content was presented. Firstly, commercial pure Mo powder was directly added into the alloy to prepare TB8 alloy ingot, and then based on using proper raw material and optimized VAR parameters, TB8 alloy ingot with high Mo content was prepared successfully. The alloy ingot was examined at different locations by composition testing and microstructure observation as well as XRD analysis. The results show that the alloy ingot exhibits homogeneous composition distribution, and the absence of inclusion and segregation of Mo element can be observed. The new VAR process is greatly superior to conventional process in raw material cost, quality cost and product cost.  
        关键词：TB8 Alloy;Melting;Segregation   
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      • Wang Jina,Xu Kaidong
        Vol. 31, Issue 7, Pages: 599-603(2011)
        摘要：Powder cladding diffusionalloying on the surface before and after nanocrystallined treatment of Mg-Gd series wrought magnesium alloy was carried out by vacuum high-temperature microwave oven. Microstructure features and structure refinement at different deformed zones on surface along thickness direction were observed by OM （optical microscope） and TEM （transmission electron microscope）, and phase constituent in the alloyed layer at different microwave treatment conditions was analyzed by XRD （X-ray diffraction）. The results show that microstructure and its structure in the deformed zone exhibit gradient distribution, and nano-crystalline with clear boundary and 1020 nm in diameters can be observed on surface of the Mg-Gd alloy specimens. Aluminized behavior on the nanocrystallined surface of Mg-Gd alloy is realized at 320 ℃ as a result of microwave induction greatly decreasing diffusion-alloying temperature. In addition, diffusion-alloy process is promoted due to high volumetric fraction grain boundary and severe distortion. At the same experimental conditions, thickness of alloyed layer on surface nanocrystallined Mg-Gd alloy is 23 times thicker than that without nanocrystallined ones.  
        关键词：Microwave Induction;Magnesium Alloy;Surface Nanocrystalline;Aluminization   
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        发布时间：2023-12-18
      • Vol. 31, Issue 7, Pages: 591(2011)
        摘要：<正>位于大连金州经济开发区、规划面积3平方公里的大连金州绿色铸造锻造产业园产业规划项目,近日通过专家组评审验收。来自中国铸造协会、国家机械科学研究总院的专家认为,该园区首次运用绿色制造、循环经济与清洁生产理念,建立了铸造锻造产业园区资源循环  
          
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        发布时间：2023-12-18
      • Vol. 31, Issue 7, Pages: 603(2011)
        摘要：<正>2011年新疆将淘汰铜铝铅落后产能3.55万吨,这项任务将于6月底前完成。根据新疆维吾尔自治区经信委的消息,2011年度该区淘汰落后产能的目标已明确,共有13个行业46家企业被纳入今年的淘汰名单。  
          
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      • Vol. 31, Issue 7, Pages: 607(2011)
        摘要：<正>泡沫塑料模型、干石英砂定型、真空震实造型———消失模铸造技术,一直以来被国内外铸造界誉为"铸造工业的绿色革命"。日前,这项铸造技术被云和一企业引进,填补了当地铸造业的空白。"别看技术难度是最高的,但生产成本却大幅度降低,因为泡沫模制作成本只有木模成本的1/3左右,所需的成型设备也相对减少,仅设备投资一项就降低了30%至50%。"潘贻清说,这项新技术还特别节能环保,采用  
          
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        发布时间：2023-12-18
      • Vol. 31, Issue 7, Pages: 622(2011)
        摘要：<正>《铸造用高纯生铁》是中国铸造行业发布的首个行业协会标准,是由中国铸造协会组织行业专家、相关铸造生铁冶炼企业在2010年期间共同努力编制完成,此标准2011年1月16日正式发布,2011年7月1日正式  
          
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      • Vol. 31, Issue 7, Pages: 631(2011)
        摘要：<正>近日,内蒙古自治区赤峰市巴林左旗赤峰山金红岭有色矿业有限责任公司日采选3000吨建设项目和赤峰宇邦矿业有限公司日采选3000吨采选项目同时开工,两个项目投产后可实现销售收入12.3亿元,带动就业2000人以上。  
          
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        发布时间：2023-12-18
      • Vol. 31, Issue 7, Pages: 639(2011)
        摘要：<正>随着国家城镇化战略的实施,全国各地都在加强供水管网等基础设施的建设和改造。从发展动向来看,全国县城和建制镇是今后国内供水管道建设发展的重点。2600多个中小城镇和广大农村乡镇都将实现自来水供应,需建立众多的自来水管网,铺设和使用更多的供水压力管材。国家的发展规划和政策导向已明确提出:  
          
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      • Vol. 31, Issue 7, Pages: 641(2011)
        摘要：<正>连日来,在湖北省广水市马坪镇加华铸造三期工程施工现场,工程技术人员正忙着架设钢构车间。"加华铸造三期工程竣工后,公司的技术装备水平将提升,年生产能力将达到4万吨。"加华铸造公司总经理王鸿加说。  
          
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      • Vol. 31, Issue 7, Pages: 652(2011)
        摘要：<正>冷水江地处湖南中部腹地,锑产量占全球60%,被称为世界锑都。欲打造产值过100亿元锑产业群。据称,当地将通过外部强强合作、内部整治锑行业,力争在5年内实现这一目标。  
          
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      • Vol. 31, Issue 7, Pages: 660(2011)
        摘要：<正>日前,从中山市经济和信息化局了解到,在6月26日举办的"广东-中山国内知名民企招商会"上,已有166个项目签约。其中最大的亮点当属共计引资442亿元布局于五镇区的五大产业平台,涉及风电、家电、精密铸造、LED及灯饰产业。而铸造产业更是在招商会上大放光彩,成为各铸造企业争相角逐的对象。  
          
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        发布时间：2023-12-18
      • Vol. 31, Issue 7, Pages: 679(2011)
        摘要：<正>近年来,圣泉集团不断把产学研合作作为建设技术创新体系的重要内容和途径,不断建立完善产学研合作创新平台,深化产学研合作层次,拓展合作领域,完成了一大批重大科技成果的推广应用和产业化。为加快经济结构调整和发展方式转变,推  
          
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        发布时间：2023-12-18
      • Vol. 31, Issue 7, Pages: 598(2011)
        摘要：<正>根据英国金属材料研究公司RoskillInformationServices公司（下简称Roskill公司）于近期透露,根据2010年统计的数据显示,作为铸造行业生产中一种专用的材料,锆石的需求量于2010年内强势反弹,每年需求增长量为5.4%,这将使锆石材料的价格不断上涨。  
          
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        发布时间：2023-12-18
      • Vol. 31, Issue 7, Pages: 611(2011)
        摘要：<正>印度Sanmar集团于近期将旗下黑色铸造企业出售给另一家印度航空航天及汽车零件供应商Dynamatic Technologies公司,但收购的具体金额并未透露。Dynamatic Technologies公司的客户包括空客公司、迪尔公司及福特汽车公司等大型企业,此次收购的企业还包括Sanmar集团位于德国埃拉  
          
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        发布时间：2023-12-18
      • Vol. 31, Issue 7, Pages: 667(2011)
        摘要：<正>6月底国际黄金价格开始持续走低,连续数天徘徊在1500美元之下。受国际黄金下跌影响,西安市场上饰金的价格也在持续"降温",西安千足金饰品价格下跌到380元390元/克,回到了今年4月初的水平。  
          
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      • Vol. 31, Issue 7, Pages: 684(2011)
        摘要：<正>韩国知识经济部表示,为了加大对稀土金属的开采力度,韩国政府将铟和锂列入"海外资源投资对象"名单。报道称,为鼓励对海外稀土的投资,知经部还计划制定《海外资源开发事业法》修订案。预计修订案将于本月内正式颁布施行。铟是银白色并略带淡蓝色的金属,主要用于电容式触控屏  
          
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        发布时间：2023-12-18
      • Tian Xuefeng,Ding Hua,Chen Jing
        Vol. 31, Issue 7, Pages: 604-607(2011)
        摘要：Microstructure variation of TC4 alloy after hydrogen treatment was investigated by optical microscope （OM）, X-ray diffraction （XRD） and transmission electron microscope （TEM）. Effects of hydrogen content on hardness of TC4 alloy were researched by hardness testing. The results show that martensite α′ and hydride δ appear in the TC4 alloy after hydrogenation treatment with increase of hydrogen content, while only α and β phase existed in the alloy after dehydrogenation. Microstructure is refined in the alloy after hydrogenation and dehydrogenation treatment, which is attributed to the transformation of eutectoid （δ+α）, in which the δ phase parallel to the α phase, and the decomposition of martensite α′. Hardness of the TC4 alloy is increased with the increase of hydrogen content after hydrogenation treatment as a result of microstructure refinement in the alloy.  
        关键词：Hydrogen Treatment;Ti-6Al-4V;Hydride;Hardness   
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      • Gao Fan1,Wang Xinying2,Wang Lei1,Han Pengbiao3,Zhang Ji2
        Vol. 31, Issue 7, Pages: 608-611(2011)
        摘要：Numerical simulation of vacuum arc remelting process of TiAl alloy with 180 mm in diameter was carried out to understand effects of melting temperature, melting velocity and cooling rate on temperature gradient in metal pool, melting pool shape and mushy zone width. The results show that with increasing in melting temperature, depth of melting pool is increased, and its shape is transformed from bowl shape to V-shape. Meanwhile, melting temperature has the slight effects on temperature gradient in melting pool and mushy zone width at solidification front. With the increase of melting velocity, temperature gradient is greatly decreased, and mushy zone width and melting pool depth are obviously decreased also. With the improvement of cooling rate, mushy zone width is greatly decreased with the slight decrease of temperature gradient and melting pool depth.  
        关键词：TiAl Alloy;Vacuum Arc Remelting;Melting Pool Shape;Mushy Zone   
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        发布时间：2023-12-18
      • Jiang Feng,Qu Jiping,Chen Yizhao,Xu Yanping,Han Jing
        Vol. 31, Issue 7, Pages: 612-615(2011)
        摘要：Effects of aging treatment on microstructure and mechanical properties of lead-free and free-cutting Al-Mg-Si alloy contained minor Sn and Bi were investigated during solid-solution and cold drawing process by tensile testing, XRD （X-ray diffraction）, SEM （scanning electron microscope） and EDS. The results show that, the optimized aging treatment is treated at 170℃ for 8 h. The alloy with Sn addition only is composed of Al matrix and Mg2Sn as well as AlMnSi phase, while the alloy with Sn and Bi addition is composed of Al, Mg3Bi2 and AlMnSi phase as well as minor Sn and Bi phase.  
        关键词：Free-cutting;Al-Mg-Si Alloy;Microstructure   
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        发布时间：2023-12-18
      • Chen Hongbing1,Luo Shuqiang1,Zhao Jianhua2
        Vol. 31, Issue 7, Pages: 615-618(2011)
        摘要：Flow behavior and heat release of aluminum alloy or magnesium alloy air intake manifolds during permanent mold tilting casting process were simulated by the Anycasting software. The results show that both magnesium alloy and aluminum alloy melt fully exhibit laminar flow during filling process. Cooling curves exhibit similar change shape for aluminum alloy and magnesium alloy manifold, however, solidification time of magnesium alloy melt is longer than that of aluminum alloy melt.  
        关键词：Magnesium Alloy;Aluminum Alloy;Manifold;Tilted Casting;Simulation   
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      • Chen Siyue,Pei Xiaohu,Yang Yitao
        Vol. 31, Issue 7, Pages: 619-622(2011)
        摘要：Casting and forging compound hot process was adopted to produce A356 aluminum alloy car steering knuckle, and product process was visualized with the help of the Adstefan and the Deform software to predict the potential defects and to optimize the processing design. The produced steering knuckle based on the compound technology was observed and its mechanical properties were tested to verify the availability of the simulated results. Finally, the advantages and feasibility of the casting and forging compound hot technology were validated.  
        关键词：Steering Knuckle;Casting;Forging;Hot Process;Simulation   
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      • Vol. 31, Issue 7, Pages: 618(2011)
        摘要：<正>2011美国拉斯维加斯国际汽车零配件展览会展会时间:2011年11月13日展会地址:美国拉斯维加斯SANDS展览中心主办单位:美国汽车零部件协会（APAA）美国汽车维修服务业协会（ASIA）美国汽车与设备商（MEMA）2011年巴西国际铸造及冶金展览会展览时间:2011年10月47日  
          
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        发布时间：2023-12-18
      • Yu Xiaolu,Mao Guobing
        Vol. 31, Issue 7, Pages: 623-625(2011)
        摘要：Based on the dynamic material model, the processing maps of LY11 alloy in the solid state and in semi-solid state were established. The instability zones of flow behavior were recognized by the maps. The results show that the instability zone during semi-solid forming process is more sensitive to strain rate than that of solid forming process. In addition, optimized processing parameters in the temperature range and different strain rates were presented by the maps. The optimized parameters are as follows: heating temperature of 560℃, strain rate of 0.001s-1 under semi-solid forming conditions, and heating temperature of 400 ℃ and strain rate of 0.001s-1 under solid forming conditions.  
        关键词：LY11 Alloy;Semi-solid;Processing Maps;Processing Parameters   
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        发布时间：2023-12-18
      • Song Puguang,Wang Kaikun,Wang Yuanning
        Vol. 31, Issue 7, Pages: 626-629(2011)
        摘要：Thixoforming process of electronic packaging shell with SiCp/Cu alloy was simulated by the finite element software Deform-3D. Effects of some parameters, such as grid change of unit, flow velocity of liquid metal and equivalent stress field as well as punching velocity, on equivalent stress were simulated in the semi-solid billets during thioxforming process. The results show that SiCp/Cu alloy electronic packaging shell with high content and uniformly distributed SiC particle can be produced at 910℃ and punching velocity of 100 mm/s, meeting the requirements of electronic packaging shell.  
        关键词：SiCp/Cu Alloy;Thixoforming;Simulation;Electronic Packaging Shell   
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        发布时间：2023-12-18
      • Li Weiming,Li Sidi,Luo Jinqi,Cai Guoming
        Vol. 31, Issue 7, Pages: 629-631(2011)
        摘要：There exist many isolated resonance signal columns in filter mould with deep cavity, resulting in the easy occurrence of cold shut, gas hole and shrinkage porosity in die casting process. Amounts of micro-hole occur in the surface layer of concave column after machining to affect the product function. Through adjusting mould design, die casting parameters and welding repair treatment for the filter cavity, micro-hole is greatly decreased in machined resonance signal column in the mould, increasing the qualified rate of product.  
        关键词：Filter;Gas Hole;Shrinkage Hole;Cold Shut   
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        发布时间：2023-12-18
      • Li Shuyu1,Tian Fuxiang2
        Vol. 31, Issue 7, Pages: 632-634(2011)
        摘要：Due to the impeller with many thin blades and the arc shaped, the difficulty point of design and working is the part formation in die casting mould. Design structure of die casting mould was presented, and production ways for part formation were described. Cavity of ten blades in forming parts was designed with inlaying five fixed inserts and five moving inserts, which was not only beneficial for mould making, but also beneficial for setting exhausting slot. The mould exhibits the feature of compact structure and reliable running performance as well as convenient operation.  
        关键词：Impeller;Forming Parts;Insert;Die Casting Die   
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        发布时间：2023-12-18
      • He Desheng,Yi Lülin,Zhu Maochun,Zhang Song
        Vol. 31, Issue 7, Pages: 634-635(2011)
        摘要：One-block internal mould substituted for two-block internal mould was adopted to simplify mould-making procedure to save product cost as well as improving the cavity of the piston mould. Easy defects occurred in the one-block internal mould and its potential location were predicted by the Magma software, and the countermeasures were presented. The desirable effects could be realized by the practical application in the piston with the small aperture.  
        关键词：Whole-internal Mould;One-block;Two-block;Exhausting Pin;Cooling Parameters   
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        发布时间：2023-12-18
      • Guo Xin,Li Xiaoyang,Lü Zhigang,Cui Xulong,Wang Changming
        Vol. 31, Issue 7, Pages: 636-639(2011)
        摘要：With the development of investment casting industry, the performance, especially the high performance of the silica sol shell was been highly required, so it was necessary to improve the quality of the shell. It was important to improve the quality of shells and castings by investigating the high temperature performance of the shell. Surface change and residual strength of the shell baked at 9001 600 ℃ were analyzed comparatively. The results show that existence of impurities in the refractory materials is closely related to the change of surface morphology of the shell. Fe, Mg, Ca, Na, and K in the refractory material can react with Al2O3 and SiO2 during baking process at high temperature to generate the low point phase, leading to the change of shell surface morphology and possible soft behavior of shell at high temperature. To ensure high surface quality and desirable de-shell ability and to reduce the possibility of high temperature softness of shell during pouring process, impurities in the shell should be strictly controlled. Residual strength of the shell exhibits basically stable at 9001 200 ℃,and residual strength of the shell is increased at 1 2001 500 ℃ as a result of mullite secondary reaction and effects of impurities, existing in the possibility of high temperature softness. Residual strength is greatly increased due to recrystallization of shell at above 1 500 ℃, resulting in the deterioration of de-shell performance.  
        关键词：Silica Sol Shell;High Temperature;Strength;Surface Change   
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      • Zhang Chunbo,Zhang Ke,Wang Feng,Zhao Yang
        Vol. 31, Issue 7, Pages: 640-641(2011)
        摘要：Sun wheel was produced by investment casting with silicate sol shell. Through designing rational gating system, selecting proper de-waxing parameters, shell-mold baking process and pouring way, serious shrinkage hole （porosity） existed in hot spot location at ingate root of the sun wheel was effectively eliminated, and a series of sun wheels were successfully produced.  
        关键词：Sun Wheel;Investment Casting;Gating System;Process   
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      • Xu Song1,Gu Wenquan2,Yu Yunfeng2,Xue Tao2,Wu Jian2
        Vol. 31, Issue 7, Pages: 642-643(2011)
        摘要：Imitation antique bronze drum for tourism was produced by investment casting. The bronze drum with thin wall and hollow structure exhibits plane shape with curved waist, and there is delicious ornamentation on the drum mould, where concave dermal ridge on complicated pattern is only 0.10.2 mm, exhibiting smart and delicacy structure. Bronze copper was used, and wax pattern making adopted paraffin and stearic acid . The bronze drum was produced successfully by shell-making and pouring.  
        关键词：Imitation Antique Artware;Investiment Casting;Bronze Drum   
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      • Zhu Wenxu,Wang Wenming,Wang Li
        Vol. 31, Issue 7, Pages: 644-646(2011)
        摘要：Sodium silicate full mold casting heat-resistant steel plate for other materials was described. Complex operation problems in turnover mold and lifting mold were solved by using sodium silicate sand and polystyrene foam molding. And shrinkage holes in dispersed hot spots were eliminated by setting internal chill. Meanwhile, other defects, such as misrun and gas hole, could be eliminated by designing anti-pouring rain gating system and rational process. The practical production verifies that the heat resistant plate exhibits the advantages of good quality, long service life and low cost.  
        关键词：Heat Resistant Steel;Material Plate;Full Mold Casting;Anti-pouring Rain Gating System   
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      • Gao Yuzhang
        Vol. 31, Issue 7, Pages: 646-647(2011)
        摘要：High nickel chrome molybdenum compound ductile iron roller was produced by centrifugal casting. Crack defects often appeared in the roll barrel, which became the important influencing factors to restrain the improvement of product quality. Through analyzing the characteristics and origination of crack in the roll barrel, the countermeasures were put forward. Through the countermeasures, crack in the roll barrel is effectively controled and decreased, increasing the qualification rate of the roller.  
        关键词：Centrifugal Casting;Crack;Compound Roller   
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      • Xu Gaolei,Yao Youfu,Luo Yuefeng
        Vol. 31, Issue 7, Pages: 648-650(2011)
        摘要：Production technology of continuous conforming for oxygen-free copper strip was introduced. Adopting large continuous conforming equipment, reversible cold roller with high precision and finished annealing furnace, through melting, up-drawing continuous casting copper rod, continuous casting-extruding copper strip billet-rough rolling-finish rolling-annealing-clean, oxygen-free copper strip was produced successfully. In the copper strip, Cu and Ag content is more than 99.99%, and oxygen content is less than 0.0005%, and electric conductivity is more than 58.58 MS/m with tensile strength of 235 MPa and elongation of 50.5%. The technology exhibits the advantages of short procedure, high efficiency and high production yield as well as low cost.  
        关键词：Continuous Conforming;Oxygen-free Copper Strip;Electric Conductivity   
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      • Mou Jundong,Wei Zuoshan,Feng Zengjian,Gao XiZhu,Yang Zhenning,Yang Jingfei
        Vol. 31, Issue 7, Pages: 650-652(2011)
        摘要：Al2O3 short fiber reinforced aluminum matrix composites for high performance piston was prepared by squeezing casting.Tensile strength and elongation of the matrix alloy and composites were analyzed comparatively at di fferent temperature.The results show that the composites exhibit the superiority in tensile strength at high temperature compared to the matrix alloy.Microstructure of the matrix alloy and the composites was observed by the OM（optical microscope）and SEM（scanning electron microscope）.The results show that there exists desirable interface bonding between the matrix alloy and the Al2O3 fiber.The fracture morphology of the composi:es was observed by the SEM.With the increase of temperature,the increase of elongation of the composites can relief the stress aggregation at the interface during tensile process,so interface bonding is enhanced and the reinforced effects are improved.  
        关键词：Engine Piston;Squeezing Casting;Composites   
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      • Shen Le,Chen Tijun,Ma Ying,Liu Mingwei,Hao Yuan
        Vol. 31, Issue 7, Pages: 653-655(2011)
        摘要：Effects of compound modification of MgCO3 and Sr on AM60B and Mg2Si phase in in-situ Mg2Si/AM60B magnesium matrix composites were investigated. The results show that trace Sr addition can greatly improve the morphology of Mg2Si phase, where primary Mg2Si phase is converted from coarse dendrite into polygonal structure, and eutectic Mg2Si phase is transformed from coarse Chinese script into fine rod-like ones or polygonal particle. Meanwhile, MgCO3 can obviously refine the AM60B matrix. Based on the above effects, the mechanical properties of the in-situ Mg2Si/AM60B magnesium matrix composites were significantly improved.  
        关键词：In-situ Mg2Si;AM60B Magnesium Alloy;Sr;MgCO3;Compound Modification   
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      • Zhao Ping1,Li Shuangshou1,Peng Hao1,Liu Jinhai2
        Vol. 31, Issue 7, Pages: 656-660(2011)
        摘要：Carbon-nanotube reinforced Mg-based bulk metallic glass composites were prepared successfully with copper mold by differential pressure casting. Moreover, the microstructure, compressive behavior, fracture strength as well as fracture morphology of the composites were investigated. The results show that there exists desirable bonding between carbon-nanotube particle and the Mg-based bulk metallic glass, and the glass forming ability and thermal stability of the Mg-based bulk metallic glass can not be apparently changed by the induction of carbon-nanotube particle. Compared with the matrix amorphous alloy, the composites exhibit obvious advantages in the maximum compressive strength and fracture displacement. Carbon-nanotube is uniformly distributed into the matrix amorphous alloy in the absence of large-area colony, meanwhile, amounts of dimple structure in the fracture morphology of the composites can be observed.  
        关键词：Carbon-nanotube;Mg Based Metallic Glass;Composites;Differential Pressure Casting   
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      • Liu Yangfan,Wang Zhaoba,Chen Youxing,Ren Yan
        Vol. 31, Issue 7, Pages: 661-664(2011)
        摘要：In order to accurately detect the defects, such as near-center or near-surface defects, in the magnesium alloy bars, ultrasonic inspection with vertical or eccentric incidence was applied. Through filtering the original signal denoising method and extracting characteristics of echo signal feature, a signal was found to recognize the defect types, such as pore, crack defects. Based on wavelet transformation enhancing original signal, B-scan image becomes clear and easy to be identified. Furthermore, according to the bars and B-scan image ratio relation, defect locations were calculated. The technology provided a simply and rapidly effective way for detecting defects in the alloy structural components.  
        关键词：Ultrasonic;Echo Signal;B Scanning   
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      • Zhang Dongsheng,Wang Jiefang,Gou Weijuan,Liu Zhongxia
        Vol. 31, Issue 7, Pages: 664-667(2011)
        摘要：The mechanism of Ti refining pure aluminum could not be described substantially by the theory of classical phase diagram, especially trace Ti on refining effects of pure Al. Valence electron structure of Ti, Al AlTi and Al3Ti phase was investigated by the empirical electron theory of solids and molecules （EET）, and covalent bond electron numbers and bonding energy were calculated. It is found that, with trace Ti addition, Al3Ti phase can be created in the pure Al to refine grain size as heterogeneous nuclei.  
        关键词：Valence Electron Structure;Bonding Energy;Al3Ti;Ti;Grain Refinement   
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      • Li Yuhai1,Yuan Yu1,Xu Boming2
        Vol. 31, Issue 7, Pages: 668-671(2011)
        摘要：Ceramic film with porous bioactive behavior on the pure Ti was successfully prepared by MAO in electrolyte solution containing 20 g/L Na2HPO4 and 2g/L KOH. Structure of the prepared film was observed by OM （optical microscope） and SEM （scanning electron microscope）. The results show that, with increasing in electrolyte concentration, the arcing voltage is decreased, and thickness of the ceramic film is increased to maximum value of 13.6 μm, and surface roughness is increased to maximum value of 3.2 μm. The prepared ceramic film with uniform porous structure on pure Ti can be observed in the optimized electrolyte solution with rational MAO processing parameters.  
        关键词：Pure Ti;MAO;Electrolyte Concentration;Ceramic Film   
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      • Chen Xidi1,CaiI Qizhou1,Yin Lisong2
        Vol. 31, Issue 7, Pages: 671-675(2011)
        摘要：The effects of cathodic & anodic duty cycles ratio of a bipolar square pulse power source on constitute,structure,surface morphology and corrosion resistance of microarc oxidation ceramic film’s were investigated. The results show that cathodic & anodic duty cycles have important influence on the film’s thickness,structure,morphology as well as corrosion resistance. Firstly,the surface roughness and mullite phase are increased with the the increese ratio of cathodic & anodic duty cycles. Secondly,a moderate da/dc is a key to obtain desirable corrosion resistance on MAO ceramics films. The duty cycle ratio also influences the film growth pattern. With da/dc≠1,the anodic voltage jumps suddenly in the third stage of the microarc oxidation time-growth curve.  
        关键词：Microarc Oxidation;6061 Aluminum Alloy;Pulse Duty Cycles;Corrosion Resistance   
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      • Shen Tao1,Xue Lihong1,Yan Youwei1,Chen Chunhao1,Shi Kunyu1,Zhang Hao1,Li Naihu2,Li Huijie2
        Vol. 31, Issue 7, Pages: 676-679(2011)
        摘要：CuCr powder was prepared with ethyl alcohol as process control agent （PCA） by mechanical alloying. Effects of PCA on powder yield, phase constituent, composition and microstructure of the mechanical alloyed powder were investigated. The results show that, with PCA addition, the powder yield and its dispersion are improved with the decrease of wear of abraser and introduction of impurities. However, excessive PCA addition can fade the grain refinement effects, leading to the decrease of solubility increment of Cr in Cu. With the 15% PCA addition, average grain size in the mechanical alloyed CuCr powder with homogeneous composition distribution after milling for 40 hours reaches up to 35 nm, and micro-strain is 0.448%, and the solid solubility of Cr in the Cu makes 1.0139%.  
        关键词：Mechanical Alloying;PCA;CuCr Composite Powder;Nanocrystalline   
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      • Bo Hairui1,Yuan Junping2,Zhou Yongheng1,Chen Lingxia2,Huang Yuheng2,Chen Shaoxing2
        Vol. 31, Issue 7, Pages: 680-684(2011)
        摘要：Influence of Zn on the properties of as-cast, cold working, electrochemical corrosion resistance, anti-tarnish of sulfuration and anti-oxidation of sterling silver were researched. The results show that with proper Zn addition, as-cast property of the sterling silver is improved, and shrinkage porosity is decreased, and compact microstructure in the silver can be observed. However, Zn addition is harmful for the improvement of the hardness of the sterling silver. With Zn addition less than 3.5%, the silver alloy exhibits acceptable cold working performance, electrochemical corrosion resistance and anti-tarnishing as well as oxidation resistance, in which, the more the Zn addition is, the better the anti-tarnishing of sterling silver is. However, with the Zn addition more than 4.5%, the cold working is deteriorated, and electrochemical corrosion resistance and anti-tarnishing are slightly decreased.  
        关键词：Zn;Sterling Silver;Microstructure;Properties;Corrosion   
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      • Vol. 31, Issue 7, Pages: 685-686(2011)
        摘要：<正>陈璋圆壶（见下页）[1]战国（公元前475-前221年）中期青铜,错金银,嵌宝石江苏盱眙出土南京博物院藏全器由7个部分、19个构件组成一件内有壶身、外部套有上下两截铜龙网络、中部由错金银铜箍构成的极其华丽复杂的青铜艺术品。上下两截铜龙网络各由48条铜龙、共576枚梅花钉形成的表层（梅花钉）、中层（龙身起处）、内层（龙身伏处）共三层的透空铜龙网络。上截网络的龙体上下起伏卷曲3次,龙身弯曲时靠近的二龙卷曲相接并以梅花钉一一缀连,每条龙缀连6枚梅花钉,48条龙共144枚梅花钉。下截网络的龙体更上下起伏卷曲9次,每条龙两侧缀连18枚梅花钉,48条龙432枚梅花钉（见图1）。  
          
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      • Vol. 31, Issue 7, Pages: 687(2011)
        摘要：<正>我国杰出的精密铸造技术专家,清华大学教授姜不居老师因病于2011年6月27日在北京不幸逝世,享年73岁!姜不居老师,女,1938年出生于江苏丹阳。1961年,清华大学冶金系热加工工艺及设备专业本科毕业后留校,长期从事特种铸造研究及教学工作,担任清华大学机械工程学院教授,兼任中国铸造协会精铸分会副主任委员、中国铸造协会教育培训工作委员会主任委员。享受国务院"政府特殊津贴"。  
          
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      • Vol. 31, Issue 7, Pages: 689(2011)
        摘要：<正>20110701粟山嘉文.铝合金金属型铸造的多阶段浇注工艺的优化.铸造工学,2010,82（9）:531-537.金属型铸造中多使用倾转式浇注,其浇注速度的设定多依靠操作者的经验,需多次调试才能确定。但对于多阶段浇注工艺,其最优的浇注速度在实际中很难依靠经验设定。因此建立一种模拟方法,通过短时间的计算就可获得多阶段浇注工艺的最优参数对于金属型铸造具有重要意义。试验装置为商业用的倾转式浇注机械手,浇勺有前后位置及倾转角度两个自由度。  
          
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      • Vol. 31, Issue 7, Pages: 690(2011)
        摘要：<正>20110701应用于低压铸造工艺中的高压水冷方法及装置,CN101905308A,2010.12.08,苏州源成铝制品制造有限公司本发明涉及一种应用于低压铸造工艺中的高压水冷方法及装置。该方法为:在轮毂铸模中,尤其是在铸模的上模和下模内侧对应轮毂PCD部位处固定设置主要由上、下模水冷盘构成的  
          
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      • Vol. 31, Issue 7, Pages: 688(2011)
        摘要：<正>《特种铸造及有色合金》杂志是对国内外公开发行的中文核心期刊。为保证期刊的高水平和高质量,特对稿件提出如下要求:1.总体要求文章要遵循"科学性、先进性、实用性"的原则,做到主题鲜明,重点突出,层次清楚,语句通顺。每篇文章的篇幅（含图、表）一般不超过5000字。勿一稿多投,其他刊物上发表过或拟用之稿件,本刊不予录用。欢迎登陆我刊网站远程稿件处理系统（www.special-cast.com）在线投稿。2.缮写要求稿件请用计算机打印,或用方格稿纸缮写,字迹工整,稿  
          
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