Grain refinement behavior and influence mechanism of Nd and Gd on Mg-3Al alloy

被引：1

作者：

Liu Q. ^{[1
]}

Xiao Q.-L. ^{[2
]}

Luo Q. ^{[1
]}

Li Q. ^{[1
,3
]}

Chou K.-C. ^{[1
]}

机构：

[1] State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai

[2] Materials Genome Institute, Shanghai University, Shanghai

[3] National Engineering Research Center for Magnesium Alloy, Chongqing University, Chongqing

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2023年 / 33卷 / 03期

基金：

中国国家自然科学基金;

关键词：

grain refinement; grain refinement mechanism; Mg-3Al alloy; rare earth elements;

D O I：

10.11817/j.ysxb.1004.0609.2022-43132

中图分类号：

学科分类号：

摘要：

Mg-3Al alloy was taken as the research object, based on the interatomic spacing misfit, the interplanar spacing mismatch and melting point between Al-X intermetallic compound and α-Mg, were calculated by E2EM model and phase diagram, the potential heterogeneous nucleation particles were screened in Mg-Al-X alloys, and the effects of Al2Nd and Al2Gd contents on the grain size of Mg-3Al alloy were explored. The effects of Nd and Gd on phase composition and microstructure of Mg-3Al alloy were analyzed, and the grain refinement mechanism of Nd and Gd on Mg-3Al alloy was revealed. The results show that adding appropriate content of Nd and Gd elements can effectively reduce the grain size of Mg-3Al alloy and increase the yield strength of the alloy. When 3% Nd and Gd is added, the grain size of Mg-3Al alloy decreases from (145±9) μm to (81±5) μm and (76±4) μm, which decrease by 44% and 48%, respectively. The yield strength of Mg-3Al-3RE alloy can be increased from 65 MPa to 76−79 MPa, and the elongation can reach 12.7%−16.5%. The grain refinement mechanism is that the Al2RE(Nd,Gd) particles can act as the heterogeneous nucleation particles of α-Mg and reduce the alloy grain size. © 2023 Central South University of Technology. All rights reserved.

引用

页码：653 / 664

页数：11

共 23 条

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