Microstructure and Mechanical Properties of Mg-5Y-3Sm-0.8Ca Alloy

摘要

Magnesium-RE alloys are interesting materials since they have excellent room and high temperature mechanical properties. A recently developed as-cast Mg-5Y-3Sm-0.8Ca (wt.%) alloy exhibits attractive strength at room temperature, while its strength is poor at elevated temperature. In order to further enhance its strength properties, solid solution and aging treatment is introduced. The microstructure and mechanical properties of Mg-5Y-3Sm-0.8Ca alloy have been investigated by means of microstucture observation and tensile tests. The results show that the microstructure of as-cast alloy consists of α-Mg matrix, Mg_(24)Y_5, Mg_(41)Sm_5 and Mg_2Ca. After solid solution and aging treatment, the microstructure of the alloy is improved obviously. Meanwhile, the mechanical properties of the alloy are further enhanced and the alloy has high tensile strength at elevated temperature.