Creep behavior of the die-cast Mg-Al alloy AS21

被引：97
|
作者：
Zhang, P [1 ]
机构：
[1] Brandenburg Tech Univ Cottbus, Lehrstuhl Metallkunde & Werkstofftech, D-03013 Cottbus, Germany
来源：
SCRIPTA MATERIALIA | 2005年 / 52卷 / 04期
关键词：
creep; magnesium alloy; AS21; precipitates; microstructure; precipitation hardening;
D O I：
10.1016/j.scriptamat.2004.10.017
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Creep behavior of the die-cast Mg-Al-based alloy AS21 was investigated at temperatures up to 150degreesC in compression. The obtained stress exponent n is in the range of 13-19. Microstructure observation clarified that the die-cast magnesium alloy is hardened by the stable rod-shaped Mg2Si precipitates. The induction of a threshold stress into the analysis leads to. a stress exponent of 5, which suggests that creep is controlled by the dislocation climb process. The origin of the threshold stress can be related to Orowan strengthening and an additional strengthening. The additional strength contribution may come from the dislocation loop debris stored at the Mg2Si rods. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：277 / 282
页数：6
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