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- W4308434467 endingPage "108921" @default.
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- W4308434467 abstract "In this work, non-equilibrium molecular dynamics simulations are conducted to investigate the melting and void evolution behind a shock-wave front in body-centered cubic (BCC)-based tantalum under hyper-velocity impact loading. The calculated radial distribution function combined with Simon melting curve are employed to determine the melting behavior. It is discovered that the classical spallation occurs when the particle velocity (Up) is less than 1.7 km/s, while the material is completely melted at Up ≥ 2.0 km/s. In other cases, the material is partially melted with a solid-liquid mixed state. Also, the dislocation and phase transformation are studied to demonstrate the role of plasticity on ductile damage. Interestingly, it is found that there is a strong sensitivity of plasticity performance to melting during cavitation. In the classical spallation, the degradation of dislocation survival space is attributed to void growth and coalescence, thereby leading to dislocation annihilation. For the micro-spallation, several dislocation lines are absorbed by surrounding voids and the remaining dislocation lines are blocked on void surfaces. In contrast, the void nucleation promotes the phase transition from BCC to face-centered cubic (FCC) crystal structure just for the classical spallation. Furthermore, the BCC phase is eventually restored in this case, but there is no similar phenomenon observed when the material is melted." @default.
- W4308434467 created "2022-11-11" @default.
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- W4308434467 date "2022-12-01" @default.
- W4308434467 modified "2023-10-16" @default.
- W4308434467 title "Unraveling the plasticity performance and melting in single crystal tantalum damaged by shock compression" @default.
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- W4308434467 doi "https://doi.org/10.1016/j.engfracmech.2022.108921" @default.
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