Microstructure and mechanical properties of as-cast and heat treated Mg-15Gd-3Y alloy
来源期刊：JOURNAL OF RARE EARTHS2011年第1期
论文作者：张磊 董选普 李继强 王文俊 王爱华 樊自田
文章页码：77 - 82
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%.
张磊1，董选普1，李继强2，王文俊1，王爱华1，樊自田1
1. State Key Laboratory of Material Forming and Mould & Die Designing,Huazhong University of Science and Technology2. School of Me-chanical and Energy,Ningbo Institute of Technology,Zhejiang University
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%.
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