Microstructures and Creep Behaviour of Mg-4Al Alloy Containing Sr and Ca

被引：0
|
作者：
Bai, Jing [1 ]
Sun, Yangshan [1 ]
Xue, Feng [1 ]
机构：
[1] Southeast Univ, Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Jiangsu, Peoples R China
来源：
CHEMICAL, MECHANICAL AND MATERIALS ENGINEERING | 2011年 / 79卷
关键词：
Magnesium alloy; microstructures; creep behaviour; strontium; calcium; ELEVATED-TEMPERATURE APPLICATIONS; DIE-CASTING ALLOYS; MAGNESIUM ALLOYS; DEFORMATION MECHANISMS; EARTH;
D O I：
10.4028/www.scientific.net/AMM.79.134
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Microstructures and creep property of the Mg-4Al based alloy with addition of 2% Sr and 1%Ca were investigated. The as-cast microstructures of the present alloy consist of dendritic alpha-Mg and two major intermetallics: lamellar eutectic C14-Mg2Ca and bulky type Mg-Al-Sr ternary phase. These intermetallics mainly distribute along grain or cell boundaries and form an almost continuous network. The alloy studied shows an excellent creep resistance under the experimental conditions. This is primarily attributed to formation of the thermostable intermetallics with addition of Sr and Ca to Mg-Al based alloy. The values of stress exponent, n, and creep activation energy, Q, imply that both dislocaiton motion and grain boundary sliding contribute to the creep deformation.
引用
收藏
页码：134 / 139
页数：6
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