Twinning and dynamic precipitation upon hot compression of a Mg鈭扜d鈭扽鈭扤d鈭抁r alloy

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• 作者：Xiuli Hou^a ; ^b ; Zhanyi Cao^b ; ^{caozy@jlu.edu.cn} ; Xu Sun^b ; Lidong Wang^a ; ^b ; Limin Wang^a ; ^{lmwang@ciac.jl.cn}
• 关键词：Mg&minus ; Gd&minus ; Y&minus ; Nd&minus ; Zr alloy ; Hot compression ; Deformation twinning ; Dynamic precipitation
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 June, 2012
• 卷：525
• 期：Complete
• 页码：103-109
• 文件大小：2196 K

摘要

The microstructure evolution in Mg-8Gd-2Y-1Nd-0.3Zn-0.6Zr alloy subjected to hot compression at 350 掳C and the strain rate of 0.5 s^鈭? was systematically investigated. Twinning and dynamic precipitation are two characteristic processes during compressive deformation. Crystallographic analysis indicates that the majority of deformation twins are of the type, possessing the misorientation of 37.5掳 from parent grain about the c-axis. With strain accumulation, the twin-twin intersections lead to grain fragmentation of the original grains. Extensive dynamic precipitation is observed in the alloy. The 尾 precipitates with irregular shapes are observed to form firstly on twin boundaries. Then the formation of rectangular 尾鈥?precipitates proceeds in the Mg matrix. The morphology of the 尾鈥?precipitates differs from that of the same phase obtained by solution and ageing treatment (i.e. T6 heat treatment), but their orientation relationships with Mg matrix keep consistent.