Effect of Hydrostatic Pressure on LPSO Kinking and Microstructure Evolution of Mg–11Gd–4Y–2Zn–0.5Zr Alloy  

作　　者：Ce Zheng Shuai-Feng Chen Rui-Xue Wang Shi-Hong Zhang Ming Cheng 

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Materials Science and Engineering and Research Institute of Advanced Materials(RIAM),Seoul National University,Seoul 08826,Republic of Korea

出　　处：《Acta Metallurgica Sinica(English Letters)》2021年第2期248-264,共17页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Contract No.51305188)。

摘　　要：Two different kinds of hot compressions,namely normal-compression and can-compression,were performed on the Mg–11 Gd–4 Y–2 Zn–0.5 Zr alloy,featured with long period stacking ordered(LPSO)phase.The kinking behavior of LPSO phase and microstructure evolution was investigated to clarify the effect of levels of imposed hydrostatic pressure.The results suggest that the LPSO phases including both the intragranular 14 H-LPSO phase and intergranular 18 R-LPSO phase suffer severe kinking behavior under higher hydrostatic pressure induced by can-compression,which is firstly characterized with more kinking times and smaller relative kinking width.The main reason for such enhanced LPSO kinking during cancompression may be mainly ascribed to the higher dislocation density under a higher level of hydrostatic pressure.Meanwhile,a competitive relationship between the kink behaviors of intergranular 18 R-LPSO phase and intragranular 14 H-LPSO phase was observed.That is,the intergranular 18 R-LPSO phase only kinks obviously on the condition that the surrounded intragranular 14 H-LPSO phase scarcely kinks.In contrast to the distinctive kinking of LPSO phase,the dynamic recrystallization(DRX)mechanism shows less dependence on the hydrostatic pressure.Resultantly,similar DRX fractions and crystallographic texture were attained for two compression processes owing to the similar operation of deformation mode.

关 键 词：Magnesium alloy Hydrostatic pressure Long period stacking ordered(LPSO)phase KINKING Dynamic RECRYSTALLIZATION 

分 类 号：TG146.22[一般工业技术—材料科学与工程]