Effects of defects and microstructure on release melting of shock-loaded copper: Atomistic simulations

An Min He, Pei Wang, Jian Li Shao

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摘要

This work is dedicated to study the effects of defects and microstructures on release melting of shock-loaded copper, based on large-scale molecular dynamics simulations. Three types of specimens are established including a single crystal with a nanovoid, a bicrystal with a twist grain boundary, and an idealized hexagonal columnar nanocrystal. The microscopic dynamics and the thermodynamic properties of these samples during shock unloading are investigated. It is revealed that preexistent defects in single crystals and anisotropic responses of constituent grains in nanocrystals, which can induce local release melting prior to homogeneous melting of defect-free regions, have noticeable influences on the release melting process. Moreover, distinct from the non-equilibrium release melting of perfect single crystals, local release melting in these systems takes place when the release path passes through the thermodynamic melting curve, demonstrating an equilibrium process.

源语言英语
文章编号015901
期刊Journal of Applied Physics
123
1
DOI
出版状态已出版 - 7 1月 2018

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