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

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Abstract

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 [\(10\bar{1}0\)] 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 [\(10\bar{1}0\)] direction, the distance between plastic and elastic waves is closer, and higher dislocation density and more twins are observed. Moreover, the spall strength for [\(10\bar{1}0\)]-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.

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Acknowledgements

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) and National Defense Science and technology foundation strengthening program.

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Authors and Affiliations

  1. Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics, Wuhan University of Technology, Wuhan, 430070, China

    Xiaoyue Yang, Shuang Xu & Lisheng Liu

  2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China

    Lisheng Liu

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Correspondence to Shuang Xu.

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Yang, X., Xu, S. & Liu, L. The Shock Response and Spall Mechanism of Mg–Al–Zn Alloy: Molecular Dynamics Study. Acta Mech. Solida Sin. 35, 495–503 (2022). https://doi.org/10.1007/s10338-021-00301-4

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