The Shock Response and Spall Mechanism of Mg-Al-Zn Alloy:Molecular Dynamics Study  

作　　者：Xiaoyue Yang Shuang Xu Lisheng Liu 

机构地区：[1]Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics,Wuhan University of Technology,Wuhan 430070,China [2]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Acta Mechanica Solida Sinica》2022年第3期495-503,共9页固体力学学报（英文版）

基　　金：This research are funded by the National Natural Science Foundation of China(11402183,51604206 and 51974217);the Fundamental Research Funds for the Central Universities of China(WUT:2017IA002);National Defense Science and technology foundation strengthening program.

摘　　要：Shock responses of Mg-Al-Zn alloy are investigated by the molecular dynamics(MD)method.The wave propagation,plastic deformation behavior and failure mechanism along the[0001]and[1010]orientations are analyzed.For both orientations,simulation results show that the shock wave has an obvious double-wave structure(plastic-elastic)under a piston velocity of 1200 m/s.A higher Hugoniot elastic limit(HEL)is observed for[0001]-oriented shock.When the shock pressure is along the[1010]direction,the distance between plastic and elastic waves is closer,and higher dislocation density and more twins are observed.Moreover,the spall strength for[1010]-oriented shock is predicted to be higher.In addition,the wave interactions,HEL and spall strength predicted for Mg-Al-Zn alloy are compared with the experimental results and MD simulation results of Mg single crystal in the literature.It is concluded that the shock performance of Mg-Al-Zn is better than that of Mg single crystal.

关 键 词：MG-AL-ZN Shock compression Molecular dynamics Hugoniot elastic limit Spall strength 

分 类 号：O342[理学—固体力学]