Refinement Role of Electromagnetic Stirring and Calcium in AZ91 Magnesium Alloy

被引：0
|
作者：
HAN Hui LIU Shengfa KANG Liugen LIU Linyan (School of Materials Science and Engineering
机构：
来源：
Journal of Wuhan University of Technology(Materials Science) | 2008年 / 02期
关键词：
AZ91 magnesium alloy; electromagnetic stirring; calcium; microstructural refinement;
D O I：
暂无
中图分类号：
TG146.22 [];
学科分类号：
080502 ;
摘要：
Effects of calcium addition and electromagnetic stirring on the microstructure of AZ91 magnesium alloy and refinement mechanism were investigated.The results show that calcium addition ranging from 0.1wt% to 0.3 wt% does not lead to formation of any new phases but cause the refinement of as- cast microstructure.However,combined calcium alloying and electromagnetic stirring significantly decrease the grain size,change the morphologies of theβ-MgAlphases,and reduce their volume percentage.The minimum grain size of AZ91 alloy is obtained in the case of the addition of 0.2 wt%Ca with exciting voltage of 100 V.The microstructural refinement is attributed to the increase of the degree of undercooling and nucleation temperature of primaryα-Mg phases on the basis of DTA analysis results.
引用
收藏
页码：194 / 197
页数：4
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