Effect of Li element on shocking behavior of Fe-Li alloys

JY Tan and ZY Jian and SF Xiao and XF Li and K Wang and HQ Deng and WJ Zhu and WY Hu, INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 247, 108165 (2023).

DOI: 10.1016/j.ijmecsci.2023.108165

Understanding the effect of alloying elements on shock behaviors is significant for constitutive model of alloy materials at under dynamic high pressure. However, an in-depth understanding about the microscopic mecha-nism of alloying elements effect on plasticity and phase transition is still limited. In this work, applying non -equilibrium molecular dynamic (NEMD) simulations, shock-induced plasticity and phase transition of Fe-Li al-loys was investigated in terms of the compositions of Li, crystallographic direction and shock velocity. The results show that yield stress (or phase change pressure) of Fe-Li alloy was reduced doping Li element, and the large internal stresses caused by concentration of Li element effectively activated the nucleation and multiplication of dislocation loops. But with the increase of Li composition, phase transition is inhibited for shock along 111 direction because of stress release caused by multiplication of dislocation. There is a strong dependence between these microscopic processes and the law of plastic wave propagation. Moreover, with the increase of Li composition, the diversity of phase transition variants was inhibited for shock along 110 direction due to the destruction of initial stress and potential energy uniformity.

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