Microstructure evolution and mechanical properties of Mg-Gd-Sm-Zr alloys

被引：58
作者：
Liu, Ningyuan [1 ]
Zhang, Zhenyan [1 ]
Peng, Liming [1 ,2 ]
Ding, Wenjiang [1 ,2 ]
机构：
[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 627卷
基金：
中国国家自然科学基金;
关键词：
Magnesium alloys; Precipitation; Aging; X-ray diffraction; HAADF-STEM; MAGNESIUM ALLOYS; MG-4Y-3RE ALLOY; MG-4Y-4SM-0.5ZR ALLOY; PRECIPITATE PHASES; WT.PERCENT ALLOY; 250-DEGREES-C; CREEP; WE54; ZN;
D O I：
10.1016/j.msea.2014.12.114
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The microstructure evolution and mechanical properties of Mg-Gd-Sm-Zr alloys during heat treatment were systematically investigated. The precipitation sequence of an alpha-Mg supersaturated solid solution (S.S.S.S., cph) during aging at 225 degrees C is: S.S.S.S. -> beta '' (D0(19)) -> beta' (cbco) -> beta(1) (fcc) -> beta (fcc), which is different from previously reported Mg-Gd-Sm systems. The observed shortened incubation periods in the Mg-Gd-Sm-Zr alloys can be mainly attributed to the increased amount of Sm present Peak-aged Mg-Gd-Sm-Zr alloys exhibit mechanical properties superior to that of the WE54 alloy. The product of strength and elongation (PSE) was used to estimate the toughness of Mg-Gd-Sm-Zr alloys, and the PSE value decreases with increasing RE content. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：223 / 229
页数：7
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