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

• Published in: Physical review materials 2023-11, Vol.7 (11), Article 113608
• Main Authors: Avraam, P., McGonegle, D., Heighway, P. G., Wehrenberg, C. E., Floyd, E., Comley, A. J., Foster, J. M., Rothman, S. D., Turner, J., Case, S., Wark, J. S.
• Format: Article
• Language: English
• Subjects: body-centered cubic; compressive Strength; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; crystalline systems; elemental metals; finite-element method; laser techniques; lattice dynamics; MATERIALS SCIENCE; mechanical and acoustical properties; mechanical deformation; metals; microstructure; multiscale modeling; plasticity; polycrystalline; polycrystalline materials; pressure effects; shock waves; x-ray diffraction; x-ray powder diffraction
• ISSN: 2475-9953; 2475-9953
• DOI: 10.1103/PhysRevMaterials.7.113608

Here we present a crystal plasticity model tailored for high-pressure, high-strain-rate conditions that uses a multiscale treatment of dislocation-based slip kinetics. We use this model to analyze the pronounced plasticity-induced lattice rotations observed in shock-compressed polycrystalline tantalum via in situ x-ray diffraction. By making direct comparisons between experimentally measured and simulated texture evolution, we can explain how the details of the underlying slip kinetics control the degree of lattice rotation that ensues. Specifically, we show that only the highly nonlinear kinetics caused by dislocation nucleation can explain the magnitude of the rotation observed under shock compression. We demonstrate a good fit between our crystal plasticity model and x-ray diffraction data and exploit the data to quantify the dislocation nucleation rates that are otherwise poorly constrained by experiment in the dynamic compression regime.