Effect of Al addition on microstructure and mechanical properties of Mg-Gd-Zn alloys

被引：10

作者：

Ding, Zhi-bing ^{[1
,2
]}

Zhang, Shuai ^{[1
,2
]}

Zhao, Yu-hong ^{[3
]}

Chen, Dong-rui ^{[1
,2
]}

Zou, Li-hua ^{[1
,2
]}

Chen, Zhi-gang ^{[1
,2
]}

Guo, Wen-min ^{[1
,2
]}

Su, Zai-jun ^{[1
,2
]}

Hou, Hua ^{[3
]}

机构：

[1] Shaoyang Univ, Coll Mech & Energy Engn, Shaoyang 422000, Peoples R China

[2] Shaoyang Univ, Key Lab Hunan Prov Efficient Power Syst & Intelli, Shaoyang 422000, Peoples R China

[3] North Univ China, Coll Mat Sci & Engn, Taiyuan 030051, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2022年 / 32卷 / 03期

关键词：

Mg-Gd-Zn-Al alloy; long-period stacking ordered (LPSO) phase; beta ' phase; mechanical properties;

D O I：

10.1016/S1003-6326(22)65836-9

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The microstructure evolution and mechanical properties of Mg-15.3Gd-1Zn alloys with different Al contents (0, 0.4, 0.7 and 1.0 wt.%) were investigated. Microstructural analysis indicates that the addition of 0.4 wt.% Al facilitates the formation of 18R-LPSO phase (Mg12Gd(Al,Zn)) in the Mg-Gd-Zn alloy. The contents of Al11Gd3 and Al2Gd increase with the increase of Al content, while the content of (Mg,Zn)(3)Gd decreases. After homogenization treatment, (Mg,Zn)(3)Gd, 18R-LPSO and some Al11Gd3 phases are transformed into the high-temperature stable 14H-LPSO phases. The particulate Al-Gd phases can stimulate the nucleation of dynamic recrystallization by the particle simulated nucleation (PSN) mechanism. The tensile strength of the as-rolled alloys is improved remarkably due to the grain refinement and the fiber-like reinforcement of LPSO phase. The precipitation of the beta'phase in the peak-aged alloys can significantly improve the strength. The peak-aged alloy containing 0.4 wt.% Al achieves excellent mechanical properties and the UTS, YS and elongation are 458 MPa, 375 MPa and 6.2%, respectively.

引用

页码：824 / 837

页数：14

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