RHEOCASTING OF A356 ALLOY BY LOW SUPERHEAT POURING WITH A SHEARING FIELD

查看全文 作　　者：H.M. [1]Guo;X.J. [2]Yang;B. [2]Hu

机构地区：[1]Department of Materials Science and Engineering, Nanchang University,Nanchang 330031, China;[2]Department of Mechanical and Electronic Engineering, Nanchang University,Nanchang 330031, China

出　　处：《Acta Metallurgica Sinica(English Letters)》索引2006年第19卷第5期,共7页

基　　金：This work was supported by the National Natural Science Foundation of China(No.50474007);Jiangxi Provincial Natural Science Foundation of China(No.0450050);the Science&Technology Project of Education Department of Jiangxi Province(No.GanJiaoJiZi[2005]24). 摘　　要：A novel semi-solid slurry-making process was developed, which was a controlled nucleation and growth technique using a specially designed rotational barrel. Experimental study was undertaken to investigate the effects of pouring temperature and rotation speed of barrel on the microstructure of A356 alloy. Localized rapid cooling, combined with vigorous mixing during the initial stage of solidification enhanced wall nucleation and nuclei survival. High nuclei density combined with a much gradual cooling afterwards led to the formation of the near-ideal semi-solid slurry under a large processing window for the pouring temperature. Primary phase presented in mean equivalent diameter of 50-70μm and shape factor of 0.812-0.847, and featured zero-entrapped eutectic. 关键词：半固态加工成核晶体生长界面稳定性铝合金剪切场

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RHEOCASTING OF A356 ALLOY BY LOW SUPERHEAT POURING WITH A SHEARING FIELD

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