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Spinodal decomposition as a possible void initialization mechanism for spallation in shock melted materials under
Yutong Yang1, Zixiang Yan2, Hao Liu3
1Peking University, HEDPS, Center for Applied Physics and Technology and School of Physics, Beijing 100871, China.
Abstract:
We show with molecular dynamics simulations that spinodal decomposition is a probable initiation mechanism of spallation in impact-melted samples at extremely high strain rates. The formation of voids or bubbles is a secondary process following the spinodal amplification of density fluctuations. As a result, the spallation strength can be related to the inherent thermodynamic property of the liquid, i.e., the liquid-gas spinodal curve, which can be determined by independent equation-of-state studies in prior. This connection between high strain-rate spallation and spinodal decomposition may be further examined in future experiments.
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