Effect of initial temper on the creep behavior of a Mg-Gd-Nd-Zr alloy

被引：33
|
作者：
Zheng, K. Y. [1 ]
Zeng, X. Q. [1 ]
Dong, J. [1 ]
Ding, W. J. [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloys Net Forming, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 492卷 / 1-2期
关键词：
magnesium alloy; creep; microstructure; dynamic precipitation; transmission electron microscopy;
D O I：
10.1016/j.msea.2008.03.009
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of initial temper on the tensile creep behavior of a cast Mg-Gd-Nd-Zr alloy has been investigated. Specimens in unaged, underaged and peak-aged conditions exhibit a sigmoidal creep stage between the primary and steady-state creep stage, while the overaged specimens have no Such Creep stage. Transmission electron microscope observations revealed that sigmoidal creep stage was induced by the dynamic precipitation in the microstructure, and the rapid formation of beta(1)-phase and beta-phase plates takes responsibility for the softening of material in this stage. Comparative evaluation of creep properties of the specimens showed that alloy in overaged condition had creep resistance superior to those in other conditions. Stress and temperature dependence of the steady-state creep rate were studied over a temperature range of 250-300 degrees C and stress range of 50-100 MPa, and a dislocation creep mechanism was proposed for the alloy. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：185 / 190
页数：6
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