Loading-path dependent deformation of nanocrystalline Ta under single- and double-shock, and quasi-isentropic compression
MX Tang and JC E and L Wang and SN Luo, JOURNAL OF APPLIED PHYSICS, 121, 115901 (2017).
We investigate dynamic deformation of nanocrystalline Ta under single- and double-shock, and quasi-isentropic compression, with large-scale molecular dynamics simulations. Orientation mapping, selected area electron diffraction, and x-ray diffraction are implemented for microstructure analysis. Different deformation modes are found for different loading paths, and are attributed to the differences in temperature rise induced by dynamic compression. For sufficiently strong shocks, catastrophic activation of slip systems and their growth in single-shock loading with the largest temperature rise lead to amorphization and recrystallization, while stacking faults and dislocation slip dominate deformation in double-shock loading with intermediate temperature rise, and deformation twinning is the principal mode in quasi-isentropic loading with the least temperature rise. Published by AIP Publishing.
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