Microstructure and mechanical properties of AZ31-0.5%Si alloy processed by ECAP
(1.上海市上海交通大学材料科学与工程学院国家金属基复合材料重点实验室净成形国家工程研究中心轻合金
2.National Engineering Research Center for Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China)
2.National Engineering Research Center for Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China)
Abstract: Microstructure and mechanical properties of AZ31-0.5%Si(mass fraction) alloy processed by ECAP were investigated. Results show that Mg2Si phase formed during solidification can be broken up and be dispersed in matrix by ECAP. With the increase of ECAP passes, Mg2Si phase in microstructure tends to distribute uniformly. The mean grain size is about 4 mm, and the mean size of Mg2Si is about 6 mm. The elongation of AZ31-0.5%Si alloy is significantly increased after ECAP and then changes a little with increasing ECAP passes. The ultimate strength of as-extruded AZ31-0.5%Si alloy reaches 348.9 MPa, while its strength decreases after ECAP.
Key words: magnesium alloy; microstructure; mechanical properties; MgSUB<2Si; ECAP