Effect of Ce-rich misch metal addition on squeeze cast microstructure and mechanical properties of AZ81 alloy

被引：7
|
作者：
Liao Hui-min [1 ]
Long Si-yuan [1 ,2 ]
Guo Cun-bao [1 ]
Zhu Zhi-bing [1 ]
机构：
[1] Chongqing Univ, Coll Mech Engn, Chongqing 400030, Peoples R China
[2] Natl Engn Res Ctr Magnesium Alloys, Chongqing 400030, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2008年 / 18卷
关键词：
cerium-rich misch metal; AZ81; alloy; microstructure; mechanical properties;
D O I：
10.1016/S1003-6326(10)60172-0
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The effect of cerium-rich misch metal addition on the microstructure and properties of squeeze cast magnesium alloys AZ81 was empirically investigated. The results indicate that the addition of cerium-rich misch metal modifies the microstructure gradually. With the increase of the RE addition, the amount of Mg17Al12 decreases while that of Al-11(RE)(3) increases, accompanied by grain refinement. When the addition reaches 1.5%, the grain refinement becomes obvious. However, when the addition exceeds 2.0%, Al-11(RE)(3) phase coarsens into rod shape and the grain size increases. The tensile properties of the AZ81 at both room temperature and 150 degrees C increase with the addition, and reach their optimal values with the addition of 1.5%. Further increase of the addition to above 2.0% decreases the tensile properties considerably. The tensile fracture of the alloy is characterized by the cleavage of the brittle second phases and ductile dimples of the matrix.
引用
收藏
页码：S44 / S49
页数：6
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