Effect of heat treatment on LPSO morphology and mechanical properties of Mg–Zn–Y–Gd alloys

• DOI: 10.1016/j.jma.2020.06.009
• Publication Date: 2020-08-15T01:49:31Z
• Authors: Hongxin Liao; Jonghyun Kim; Taekyung Lee; Jiangfeng Song; Jian Peng; Bin Jiang; Fusheng Pan
• Keywords: Elongation; Morphology

The mechanical properties and microstructure were investigated under different Zn content heat treatment conditions in a Mg–Zn–Y–Gd cast alloy. A part of the long period stacking order (LPSO) phases transformed to W-Mg3Zn3RE2 with an increase from 0.9 at.% 1.8 at.%, ultimate tensile strength (UTS) increased 229 MPa 248 MPa. With solution at 480°C, LPSO phase sharply decreased Mg-1.8Zn-0.8Y-0.8Gd alloy, whereas this change was not significantly observed Mg–0.9Zn–0.8Y–0.8Gd After treatment, elongation improved UTS both alloys. lamellar filminess aging 200°C. Moreover, strengthening efficiency lower than that block phases. Therefore, T6 state as-cast