Effect of double aging on mechanical properties and microstructure of EV31A alloy

被引：10
作者：
Gu, Kan [1 ,2 ,3 ]
Zeng, Xiao-qin [1 ,2 ,3 ]
Chen, Bin [1 ]
Wang, Ying-xin [1 ,2 ,3 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China
[3] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composite, Shanghai 200240, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2021年 / 31卷 / 09期
基金：
中国国家自然科学基金;
关键词：
magnesium alloy; EV31A; double aging; mechanical properties; beta ' phase; MG-RE ALLOYS; HEAT-TREATMENT; ELEKTRON; 21; EVOLUTION; PRECIPITATION; PHASE; GD;
D O I：
10.1016/S1003-6326(21)65679-01003-6326
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
To improve the ductility of a commercial Mg-rare earth alloy EV31A (Mg-3Nd-1.5Gd-0.3Zn-0.5Zr), a heat treatment method called double aging is explored, and its effect on mechanical properties and microstructure of the alloy is studied. Ultimate strength and elongation of the alloy can be increased to 288 MPa and 6.6% by the optimum double aging process, compared to 273 MPa and 4.9% after single aging. Time consumption of the aging process is also significantly decreased from 16 h (single aging) to 2 h. HAADF-STEM characterization shows that the primary precipitate is beta' phase, which is similar to beta' phase in Mg-Nd binary alloy. By double aging, the beta' phase is finer and more densely distributed compared with single aging, with approximately double density and half size, which explains the improvement in strength and ductility.
引用
收藏
页码：2606 / 2614
页数：9
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