摘要
Creep tests of Mg-5%Zn-2%Al(-2%Y) (mass fraction) alloy were carried out at 175 ℃ under the load of 50 MPa, on the cast and solution condition, respectively. Relationship between the creep behavior and microstructure was studied by the optical microscopy, SEM and TEM. The result shows that the primary creep strain is relative to the thermo-stability and the quantity of intermetallic compounds in grain boundary area. During the secondary creep period, the minimum creep rate of solution-treated specimens is substantially decreased as a result of dynamic MgZn2 precipitation.
Creep tests of Mg-5%Zn-2%Al(-2%Y) (mass fraction) alloy were carded out at 175 ℃ under the load of 50 MPa, on the cast and solution condition, respectively. Relationship between the creep behavior and microstructure was studied by the optical microscopy, SEM and TEM. The result shows that the primary creep strain is relative to the thermo-stability and the quantity of intermetallic compounds in grain boundary area. During the secondary creep period, the minimum creep rate of solution-treated specimens is substantially decreased as a result of dynamic MgZn2 precipitation.
出处
《中国有色金属学会会刊:英文版》
EI
CSCD
2008年第3期580-587,共8页
Transactions of Nonferrous Metals Society of China
关键词
镁合金
微结构
镁-锌相
动力沉淀
Mg alloy
microstructure
creep deformation
Mg-Zn phase
dynamic precipitation