Microstructure and mechanical properties of as-cast and heat treated Mg-15Gd-3Y alloy

被引：0

作者：

张磊 ^{[1
]}

董选普 ^{[1
]}

李继强 ^{[2
]}

王文俊 ^{[1
]}

王爱华 ^{[1
]}

樊自田 ^{[1
]}

机构：

[1] State Key Laboratory of Material Forming and Mould & Die Designing,Huazhong University of Science and Technology

[2] School of Me-chanical and Energy,Ningbo Institute of Technology,Zhejiang University

来源：

Journal of Rare Earths | 2011年 / 29卷 / 01期

关键词：

Mg-15Gd-3Y alloy; solution heat treatment; microstructure; age-hardening; mechanical properties; rare earths;

D O I：

暂无

中图分类号：

TG166.4 [镁及其合金的热处理];

学科分类号：

080201 ; 080503 ;

摘要：

The microstructure evolution and mechanical properties of Mg-15Gd-3Y alloy were investigated in the as-cast and heat treated conditions.The microstructure evolution from as-cast to cast-T4 states involved α-Mg solid solution+Mg5(Gd,Y) phase→α-Mg supersatu-rated solid solution+rare earths compound Mg3(Gd1.26,Y0.74)→α-Mg supersaturated solid solution+rare earths compound Mg3(Gd0.745,Y1.255).It showed that 480 oC/4 h was the optimal solution treatment parameter.If the solution temperature was high or the holding time was long,such as 520 oC/16 h,an overheating phenomenon would be induced,which had a detrimental effect on the mechanical properties.When age-ing at 225 and 200 oC,the alloy would exhibit a significant age-hardening response and great long-time-age-hardening potential,respectively.The best mechanical properties were obtained at the parameters of 480 oC/4 h+225 oC/16 h,with the UTS of 257.0 MPa and elongation of 3.8%.

引用

页码：77 / 82

页数：6