Creep characteristics of a diecast AM50 magnesium alloy

被引:0
|
作者
Naoya Ishimatsu
Yoshihiro Terada
Tatsuo Sato
Koichi Ohori
机构
[1] Tokyo Institute of Technology,the Department of Metallurgy and Ceramics Science
[2] Mitsubishi Aluminum Co.,the Technical Development Center
[3] Ltd.,undefined
来源
Metallurgical and Materials Transactions A | 2006年 / 37卷
关键词
Material Transaction; Magnesium Alloy; Creep Rate; Creep Test; Stress Exponent;
D O I
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中图分类号
学科分类号
摘要
Tensile creep tests were conducted to examine the creep behavior of a diecast AM50 magnesium alloy in the temperature range from 423 to 498 K. A normal transient creep stage is followed by a minimum creep rate stage and finally by an accelerating stage at each creep condition. The stress exponent of the minimum creep rate, n, increases from ∼5 at lower stresses to ∼10 at higher stresses at each temperature, and the value of n changes at the yield stress of the alloy. The activation energies for the creep, Qc, are determined to be 121±10 and 162 kJ/mol, at lower and higher stresses, respectively. It is concluded that the creep of the diecast AM50 alloy is controlled by the high-temperature climb of dislocations, whereas the instantaneous plastic strain introduced by the higher stress of the creep test is assumed to cause the increased values of n and Qc.
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页码:243 / 248
页数:5
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