Semisolid microstructure evolution of AZ91D alloy under high shear rate  

作　　者：ZHU Guanglei XU Jun ZHANG Zhifeng LIU Guojun 

机构地区：[1]National Engineering ＆ Technology Research Center for Nonferrous Metal Matrix Composites,General Research Institute for Nonferrous Metals,Beijing 100088,China

出　　处：《Rare Metals》2011年第1期99-103,共5页稀有金属（英文版）

基　　金：supported by the National High-Tech Research and Development Program of China (No.2009AA03Z534);the National Basic Research Program of China (No. 2006CB605203);the International Cooperation in Technical Research and Development Program of China (No.2009DFB50210)

摘　　要：Experimental work was undertaken to investigate the effect of rotation speed on the solidification microstructure of AZ91D alloy using a twin-screw slurry maker.Then numerical simulation was used to investigate the effect of rotation speed on the flow filed and temperature field of the melt.It was found that increasing the rotation speed could give rise to substantial grain refinement,which can be attributed to the increase of effective nucleation rate caused by the extremely uniform temperature and dispersing any potential clusters of nucleation agents in the bulk liquid under dispersive mixing.

关 键 词：magnesium alloys microstructural evolution SHEARING grain refinement solidification 

分 类 号：TG146.22[一般工业技术—材料科学与工程] O781[金属学及工艺—金属材料]