Influence of heat treatment on microstructure and mechanical properties of Mg-10Gd-3Y-1.2Zn-0.4Zr alloy

被引：22
作者：
Li De-jiang [1 ]
Zeng Xiao-qin [1 ,2 ]
Dong Jie [1 ]
Zhai Chun-quan [1 ]
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：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2008年 / 18卷
关键词：
Mg-Gd-Y-Zn-Zr alloy; microstructure; LPSO structured phase; mechanical properties;
D O I：
10.1016/S1003-6326(10)60186-0
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Microstructure evolution and mechanical properties of the cast Mg-10Gd-3Y-1.2Zn-0.4Zr (mass fraction, %) alloy during annealing at 798 K for different time were investigated. In the as-cast state, the microstructure consists of alpha-Mg, Mg-5(Gd, Y, Zn) eutectic compounds and stacking faults(SF) of basal plane distributed from grain boundary to inner grain. During heat treatment at 798 K, the SF and parts of eutectic compounds dissolve into the matrix gradually, simultaneously, a new straight lamellar phase with 14H type of long period stacking ordered(LPSO) structure comes into being. Microstructure observation indicates that the lamellar phase is transformed from the un-dissolved eutectic compounds and shows a coarsening and disappearing process with annealing time prolonging. Three alloy specimens with typical microstructure after being annealed for 6, 36 and 72 h were selected to age at 498 K to peak hardness. Room and elevated temperature tensile tests show that the LPSO structured phase contributes to the change of high temperature tensile properties.
引用
收藏
页码：S117 / S121
页数：5
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