Through alloy preparation

microstructure observation and the mechanical properties test

effects of heat treatment on microstructures and mechanical properties of the Mg-Zn-Zr magnesium alloy have been investigated.The results show that

the microstructure of Mg-5.5Zn-0.5Zr alloy can be improved by solid solution（380 ℃×12 h） and aging（190 ℃×12 h） treatment

and mechanical properties at room temperature and at high temperature can be increased effectively.Direct aging treatment exhibits the equivalent or even better effects with the solid solution treatment

meanwhile

it has the advantages of simple processing procedure and convenient operation

optimizing efectively the heat-treatment process of Mg-Zn-Zr alloy.