Effect of substituting cerium-rich mischmetal with lanthanum on high temperature properties of die-cast Mg–Zn–Al–Ca–RE alloys
- 作者：Anyanwu ; Ifeanyi A. ; Gokan ; Yasuhiro ; Suzuki ; Atsuya ; Kamado ; Shigeharu ; Kojima ; Yo ; Takeda ; Suguru ; et. al.
- 关键词：Magnesium alloys ; Die-casting ; Grain boundary compounds ; Heat resistance
- 刊名：Materials Science and Engineering ; A
- 出版年：2004
- 期刊代码：61_09215093
- 类别：ms
- 出版时间：August 25, 2004
- 卷：380
- 期：1-2
- 页码：93-99
- 文件大小：558 K
摘要
Mg–Zn–Al–Ca–RE alloys have been found to be promising materials for substituting aluminum alloys used for automatic transmission case applications in the automobile industry. Particularly, Mg–0.5%Zn–6%Al–1%Ca–3%RE (ZAXE05613) alloy exhibits comparable creep resistance as ADC12 die-casting aluminum alloy that is currently used for automatic transmission case applications. Changing the rare earth (RE) content of the alloy from mischmetal to lanthanum gives a further improvement in the creep properties of the alloy. Lanthanum addition results in the crystallization of a large amount of acicular Al<sub>11sub>RE<sub>3sub> (Al<sub>11sub>La<sub>3sub>) compound along the grain boundaries as well as across the grain boundaries and this effectively controls grain boundary sliding and dislocation motion in the vicinity of the grain boundaries. As a result, die-cast ZAXLa05613 alloy exhibits a higher creep resistance than that of ZAXE05613 alloy.