By observing the microstructure evolution of Mg-Ga alloy during tensile deformation,it is found that the prismaticslip and the pyramidalslip occur during the tensile process at room tem-perature,which finally leads to the plenty of dislocation accumulation.After 8％tensile deformation,the{1012}extension twin is the main way to coordinate the strain in the c-axis direction for the al-loy with the Ga content lower than 2 wt.％,but the pyramidalslip is the main way to coordinate the strain along the c-axis direction for the alloy with the Ga content higher than 2 wt.％.The Ga addi-tion can promote the activation of the non-basal slip,which is beneficial to the work-hardening of the alloy to achieve better plasticity.Dynamic precipitation can slightly reduce the increment of dislocations.The preparation method of high strain rate rolling(HSRR)is another important reason for the plastic-ity of magnesium alloy sheets,and it is an important embodiment of the application of the dislocation engineering concept in magnesium alloy.The non-basal dislocations derived from the HSRR deformation can provide the non-basal dislocation sources when magnesium alloy is deformed at room temperature,resulting in good ductility.This study can be used as a reference for preparing wrought magnesium alloy with high strength and high plasticity by Ga alloying and hot deformation.

Wensen Huang;Jihua Chen;Hongge Yan;Weijun Xia;Bin Su

School of Materials Science and Engineering,Hunan University,Changsha 410082,China;Hunan Provincial Key Laboratory of Spray Deposition Technology&Application,Hunan University,Changsha 410082,China

材料科学技术（英文版）

[1]Wensen Huang;Jihua Chen;Hongge Yan;Weijun Xia;Bin Su-.High plasticity mechanism of high strain rate rolled Mg-Ga alloy sheets)[J].材料科学技术（英文版）,2022(06):187-198

HSRR

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