Research Abstract

Mg-Gd-Y-Zn-Zr合金のミクロ組織変化と機械的性質に及ぼす長周期積層規則(LPSO)相および積層欠陥(SF)の影響 ブックマーク

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

2017年1月30日 Scientific Reports 7 : 40846 doi: 10.1038/srep40846 (2017)


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

Corresponding Authors

Chao Xu
長岡技術科学大学 高性能マグネシウム工学研究センター

Mingyi Zheng
Harbin Institute of Technology

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.