Creep and microstructure of magnesium-aluminum-calcium based alloys

被引：1
|
作者：
Alan A. Luo
Bob R. Powell
Michael P. Balogh
机构：
[1] General Motors Research and Development Center,Materials and Processes Lab.
[2] General Motors Research and Development Center,Chemical and Environmental Sciences Lab.
来源：
Metallurgical and Materials Transactions A | 2002年 / 33卷
关键词：
Material Transaction; Magnesium Alloy; Stress Exponent; Creep Strength; Creep Mechanism;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
This article describes the creep and microstructure of Mg-Al-Ca-based magnesium alloys (designated as ACX alloys, where A stands for aluminum; C for calcium; and X for strontium or silicon) developed for automotive powertrain applications. Important creep parameters, i.e., secondary creep rate and creep strength, for the new alloys are reported. Creep properties of the new alloys are significantly better than those of the AE42 (Mg-4 pct* Al-2 pct RE**) alloy, which is the benchmark creep-resistant magnesium die-casting alloy. Creep mechanisms for different temperature/stress regimes are proposed. A ternary intermetallic phase, (Mg,Al)2Ca, was identified in the microstructure of the ACX alloys and is proposed to be responsible for the improved creep resistance of the alloys.
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页码：567 / 574
页数：7
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