Development of high strength sand cast Mg-Gd-Zn alloy by co-precipitation of the prismatic β' and β1 phases

被引：62
作者：
Wang, Dan [1 ,2 ]
Fu, Penghuai [1 ,2 ,3 ]
Peng, Liming [1 ,2 ]
Wang, Yingxin [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 Composite, Shanghai 200240, Peoples R China
[3] Shanghai Light Alloy Net Forming Natl Engn Res Ct, Shanghai 201615, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2019年 / 153卷
基金：
中国国家自然科学基金;
关键词：
Mg alloy; Mg-Gd-Zn; Basal precipitate; Prismatic precipitate; Strengthening mechanism; STACKING ORDERED STRUCTURE; MECHANICAL-PROPERTIES; HEAT-TREATMENT; MICROSTRUCTURE EVOLUTION; TENSILE PROPERTIES; WT.PERCENT ALLOY; MAGNESIUM ALLOYS; ZR; PRECIPITATION; TOUGHNESS;
D O I：
10.1016/j.matchar.2019.04.036
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In order to design a high strength sand cast Mg-Gd-Zn alloy, the microstructures and mechanical properties of cast Mg-12Gd-xZn-0.4Zr (chi = 0, 0.4, 0.8) (wt%, signed as GZ1200K, GZ1204K and GZ1208K) alloys were studied. Zn addition changes the constitution of the strengthening phases in Mg-12Gd alloy. Small amount of Zn addition leads to the formation of basal precipitates of gamma" and gamma', accelerated-precipitation of the beta(1) phases and lower number density of the prismatic beta' phases, and modifies the morphology of the prismatic beta' precipitates. Compared with the Zn-free alloy, the Zn-containing alloys (GZ1204K & GZ1208K) having higher yield strength in peak-aged and over-aged conditions are mainly due to the extra prismatic beta(1), precipitates, which do not precipitate in the Zn-free alloy. Under sand casting condition, GZ1208K alloy strengthened by the co-precipitates of the prismatic beta' and beta(1) phase indicates a good combination of strength and ductility at room temperature: yield strength of 270 MPa, ultimate tensile strength of 348 MPa and elongation of 2.6%.
引用
收藏
页码：157 / 168
页数：12
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