Investigation on microstructure and creep properties of as-cast and aging-treated Mg-6Sn-5Al-2Si alloy

被引：19

作者：

Lee, Sang Gu ^{[1
]}

Jeon, Jong Jin ^{[1
]}

Park, Kyung Chul ^{[1
]}

Park, Yong Ho ^{[1
]}

Park, Ik Min ^{[1
]}

机构：

[1] Pusan Natl Univ, Dept Mat Sci & Engn, Pusan 609735, South Korea

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 16-17期

关键词：

Mg alloys; Microstructure; Creep properties; Heat treatment; MAGNESIUM ALLOYS; BEHAVIOR; AZ91; SI; SN;

D O I：

10.1016/j.msea.2011.03.080

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This study examined the high temperature mechanical properties of as-cast, solution-treated and aging-treated Mg-6Sn-5Al-2Si alloy. The microstructure of as-cast Mg-6Sn-5Al-2Si alloy mainly consisted of alpha-Mg, Mg(17)Al(12), Mg(2)Si and Mg(2)Sn phases. After solution heat-treatment, most of the Mg(17)Al(12) phases were dissolved into the matrix. In the case of aging heat-treatment, finely distributed Mg(17)Al(12) and Mg(2)Sn phases were evenly formed inside the grains. The ultimate tensile strength of solution treated Mg-6Sn-5Al-2Si alloy at 25 degrees C was decreased due to the reduced volume fraction of Mg(17)Al(12) phase. However, the creep resistance was increased by solution heat-treatment because of complete dissolution of the thermally unstable Mg(17)Al(12) phase into the Mg matrix. On the other hand, both the tensile strength at 25 degrees C and creep resistance of the peak-aged Mg-6Sn-5Al-2Si alloy were improved as compared to those of the as-cast alloy. It seems that the improved mechanical properties were associated with finely distributed Mg(17)Al(12) and Mg(2)Sn phases. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：5394 / 5399

页数：6

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