Preparation of AZ91D magnesium alloy semi-solid billet by new strain induced melt activated method
(1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. Postdoctoral Mobile Station of Mechanics, Harbin Institute of Technology,
Harbin 150001, China)
2. Postdoctoral Mobile Station of Mechanics, Harbin Institute of Technology,
Harbin 150001, China)
Abstract: New strain induced melt activated (new SIMA) method for preparing AZ91D magnesium alloy semi-solid billet is introduced by applying equal channel angular extrusion into strain induced step in SIMA method, by which semi-solid billet with fine spheroidal grains and average grain size of 18 μm can be prepared. Furthermore, average grain size of semi-solid billet is reduced with increasing extrusion pass of AZ91D magnesium alloy obtained in ECAE process. By using semi-solid billet prepared by new SIMA, thixoforged magazine plates component with high mechanical properties such as yield strength of 201.4 MPa, ultimate tensile strength of 321.8 MPa and elongation of 15.3%, can be obtained.
Key words: equal channel angular extrusion; semi-solid billet; strain induced melt activated method; mechanical properties