# Crystal plasticity finite element simulation of lattice rotation and x-ray diffraction during laser shock-compression of Tantalum

Source: [Crystal plasticity finite element simulation of lattice rotation and x-ray diffraction during laser shock-compression of Tantalum](<https://www.sota2.com/research/paper/68fa3fde1e209131ce8eeed9>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-25T02:29:23.921Z

Authors: P. Avraam, D. McGonegle, P. G. Heighway, C. E. Wehrenberg, E. Floyd, A. Comley, J. M. Foster, J. Turner, S. Case, J. S. Wark

Published: 2021-08-11T11:45:48.000Z

## Abstract

Wehrenberg et. al. \[Nature 550 496 (2017)\] used ultrafast in situ x-ray diffraction at the LCLS x-ray free-electron laser facility to measure large lattice rotations resulting from slip and deformation twinning in shock-compressed laser-driven \[110\] fibre textured tantalum polycrystal. We employ a crystal plasticity finite element method model, with slip kinetics based closely on the isotropic dislocation-based Livermore Multiscale Model \[Barton et. al., J. Appl. Phys. 109 (2011)\], to analyse this experiment. We elucidate the link between the degree of lattice rotation and the kinetics of plasticity, demonstrating that a transition occurs at shock pressures of $\\sim$27 GPa, between a regime of relatively slow kinetics, resulting in a balanced pattern of slip system activation and therefore relatively small net lattice rotation, and a regime of fast kinetics, due to the onset of nucleation, resulting in a lop-sided pattern of deformation-system activation and therefore large net lattice rotations. We demonstrate a good fit between this model and experimental x-ray diffraction data of lattice rotation, and show that this data is constraining of deformation kinetics.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2108.05166>)

[PDF](<https://arxiv.org/pdf/2108.05166.pdf>)