Microstructure and elevated temperature properties of die-cast AZ91-xNd magnesium alloys

被引：26
|
作者：
Wang, Jun [1 ]
Wang, Limin [1 ]
An, Jian [2 ]
Liu, Yongbing [2 ]
机构：
[1] Chinese Acad Sci, Key Lab Rare Earth Chem & Phys, Changchun Inst Appl Chem, Changchun 130022, Peoples R China
[2] Jilin Univ, Key Lab Automobile Mat Minist Educ, Changchun 130025, Peoples R China
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2008年 / 17卷 / 05期
关键词：
die-cast magnesium alloys; microstructure; elevated temperature properties; Nd;
D O I：
10.1007/s11665-007-9168-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of Nd addition on the microstructure and mechanical properties of a die-cast AZ91 alloy was investigated in the present work. The results show that the die-cast AZ91 alloy is composed of alpha-Mg matrix and gamma-Mg17Al12 phase. Nd addition into the AZ91 alloy leads to the formation of rare earth containing intermetallic phase. Al4Nd phase forms when Nd content is less than or equal to 1.0 wt.%. Al2Nd phase appears simultaneously when Nd content reaches to 3.0 wt.%. The size and volume fraction of gamma-Mg17Al12 phase decrease, because of the newly formed Al-Nd phase. And the gamma-Mg17Al12 phase distributes from reticular to dispersive. Nd addition has a little effect on the room temperature properties of the die-cast AZ91 alloy, but greatly improves the elevated temperature properties. The tensile strength of AZ91-0.5Nd and AZ91-1.0Nd alloy tested at 150 degrees C is even close to the room temperature strength. The AZ91-1.0Nd alloy has the optimal properties.
引用
收藏
页码：725 / 729
页数：5
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