Revisiting the evolution behaviors of β′ phase in Mg-Nd and Mg-Y alloys

被引：1
|
作者：
Zhu, Qingchun
Li, Yangxin [1 ]
Zhang, Huan
Qi, Xixi
Zeng, Xiaoqin [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China
来源：
MATERIALS LETTERS | 2021年 / 305卷
基金：
中国国家自然科学基金;
关键词：
Metals and alloys; Microstructure; Electron microscopy; PRECIPITATION;
D O I：
10.1016/j.matlet.2021.130857
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The beta' phase is considered as one of the most effective strengthening phases in Mg-RE based alloys. In this paper, we investigate the evolution behaviors of two typical beta' phases, i.e. beta(s)' and beta(l)', in the Mg-1.5Nd and Mg-11Y alloys during ageing at 225 degrees C, respectively. During the beta' evolution, the RE composition in precipitates is increased from Mg7RE (beta') to Mg3RE (beta '' or beta(t)'') due to the decrease of formation energy. The beta(s)' phase could be transformed into the D0(19) -beta '' phase in the Mg-1.5Nd alloy, while the beta(l)' phase could be transformed into the beta(t)'' phase. The evolution behaviors of beta' phases in Mg-Nd and Mg-Y systems are rationalized by density functional theory (DFT) calculations, which will offer a guideline to regulate the structure and distribution of precipitates in Mg-RE based alloys.
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页数：4
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