Effect of LPSO and SFs on microstructure evolution and mechanical properties of Mg-Gd-Y-Zn-Zr alloy

Chao Xu; Taiki Nakata; Xiaoguang Qiao; Mingyi Zheng; Kun Wu; Shigeharu Kamado

doi:10.1038/srep40846

Effect of LPSO and SFs on microstructure evolution and mechanical properties of Mg-Gd-Y-Zn-Zr alloy

Sci Rep. 2017 Jan 30:7:40846. doi: 10.1038/srep40846.

Authors

Chao Xu^{1

2}, Taiki Nakata², Xiaoguang Qiao¹, Mingyi Zheng¹, Kun Wu¹, Shigeharu Kamado²

Affiliations

¹ School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China.
² Research Center for Advanced Magnesium Technology, Nagaoka University of Technology, Nagaoka 940-2188, Japan.

Abstract

High performance Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy with high strength and excellent ductility has been successfully developed by hot extrusion. The effect of plate-shaped long period stacking ordered (LPSO) phases and solute-segregated stacking faults (SFs) on the dynamically recrystallization (DRX) behavior was analyzed. The plate-shaped LPSO phases stimulate the DRX by particle stimulated nucleation mechanism, leading to higher DRX ratio and weaker basal texture. While for the alloy with dense fine SFs inside the original grains, discontinuous DRX initially occurs at the original grain boundaries, and the DRX is obviously restricted. Consequently, alloy containing dense SFs exhibits higher strength but lower ductility compared with alloy with plated-shaped LPSO phases.

Publication types

Research Support, Non-U.S. Gov't