Microstructures and creep behavior of as-cast and annealed heat-resistant Mg-4Al-2Sr-1Ca alloy

被引：9

作者：

Bai, Jing ^{[1
]}

Sun, Yangshan ^{[1
]}

Xue, Feng ^{[1
]}

Zhou, Jian ^{[1
]}

机构：

[1] Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 531卷

关键词：

Magnesium alloys; Strontium; Calcium; Creep; Microstructure; AL-BASED ALLOYS; MAGNESIUM ALLOYS; LAVES PHASES; ELEVATED-TEMPERATURES; BASE ALLOY; DEFORMATION; MECHANISMS; TRANSFORMATIONS; ADDITIONS; ELEMENTS;

D O I：

10.1016/j.msea.2011.10.045

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Microstructures, mechanical and creep properties of Mg-4Al-2Sr-1Ca alloy were investigated. As-cast microstructure of the experimental alloy consists of dendritic alpha-Mg and grain boundary intermetallics, predominantly lamellar eutectic C14-Mg2Ca and bulky Mg-Al-Sr ternary phase. In addition, small amounts of C36-(Mg, Al)(2)Ca and Mg17Sr2 phases were also observed. Annealing at 400 C leads to the transformation of Laves phases from C14 (or C14 + C36) to C15. Meanwhile, the lamellar eutectic tends to be spheroidised and the continuous intermetallic network is broken up with prolongation of annealing time. The as-cast alloy shows a very high creep resistance at the temperatures between 150 and 200 degrees C and applied stresses between 50 and 80 MPa. Annealing at 400 degrees C results in a remarkable decrease of creep properties due to the morphological modification of the grain boundary intermetallics. It is proposed that both dislocation motion and grain boundary sliding contribute to the creep deformation

引用

页码：130 / 140

页数：11

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