Refinement role of electromagnetic stirring and calcium in AZ91 magnesium alloy

被引：3
|
作者：
Hui, Han [1 ]
Shengfa, Liu [1 ]
Lingen, Kang [1 ]
Linyan, Liu [1 ]
机构：
[1] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Peoples R China
来源：
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION | 2008年 / 23卷 / 02期
关键词：
AZ91 magnesium alloy; electromagnetic stirring; calcium; microstructural refinement;
D O I：
10.1007/s11595-006-2194-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
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 the beta-Mg17Al12 phases,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 primary alpha-Mg phases on the basis of DTA analysis results.
引用
收藏
页码：194 / 197
页数：4
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