Effects of solution heat treatment on microstructure and
mechanical properties of AZ61-0.7Si magnesium alloy
mechanical properties of AZ61-0.7Si magnesium alloy
(1. College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400050, China;
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China)
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China)
Abstract: The effects of solution heat treatment on the microstructure and mechanical properties of AZ61-0.7Si magnesium alloy were investigated. The results indicate that the solution heat treatment can modify the Chinese script shaped Mg2Si phases in the AZ61-0.7Si magnesium alloy. After being solutionized at 420 ˚C for 16−48 h, the morphology of the Mg2Si phases in the AZ61-0.7Si alloy changes from the Chinese script shape to the short pole and block shapes. Accordingly, the tensile and creep properties of the AZ61-0.7Si alloy are improved. After being solutionized at 420 ˚C for 24 h and followed by aging treatment at 200 ˚C for 12 h, the heat-treated alloy exhibits relatively high tensile and creep properties than those of the as-cast alloy.
Key words: magnesium alloy; solution heat treatment; Mg2Si phase; modification