Sr对AZ91镁合金铸态组织的影响及其细化机制

1.武汉理工大学,湖北,武汉,430070

2.武汉理工大学,湖北,武汉,430070

基金项目: 湖北省自然科学基金(2004ABA110) 武汉理工大学校科研和教改项目(2003XJJ010)

The Influence of Sr Addition on the Microstructure of AZ91 Magnesium Alloy and Its Refinement Mechanism

借助金相显微镜研究了Sr对AZ91镁合金铸态显微组织的影响.结果表明,少量的Sr(0.2%～0.5%,质量分数,下同)对合金的铸态组织具有明显细化作用,并增加合金的密度.进一步增加Sr含量,合金组织有粗化倾向,而且形成杆状Al4Sr新相.利用差热分析和电子探针研究了合金铸态组织的细化机制.

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