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Title: Shock compression and release of a-axis magnesium single crystals: Anisotropy and time dependent inelastic response

Here, to gain insight into inelastic deformation mechanisms for shocked hexagonal close-packed (hcp) metals, particularly the role of crystal anisotropy, magnesium (Mg) single crystals were subjected to shock compression and release along the a-axis to 3.0 and 4.8 GPa elastic impact stresses. Wave profiles measured at several thicknesses, using laser interferometry, show a sharply peaked elastic wave followed by the plastic wave. Additionally, a smooth and featureless release wave is observed following peak compression. When compared to wave profiles measured previously for c-axis Mg, the elastic wave amplitudes for a-axis Mg are lower for the same propagation distance, and less attenuation of elastic wave amplitude is observed for a given peak stress. The featureless release wave for a-axis Mg is in marked contrast to the structured features observed for c-axis unloading. Numerical simulations, using a time-dependent anisotropic modeling framework, showed that the wave profiles calculated using prismatic slip or (10$$\bar{1}$$2) twinning, individually, do not match the measured compression profiles for a-axis Mg. However, a combination of slip and twinning provides a good overall match to the measured compression profiles. In contrast to compression,prismatic slip alone provides a reasonable match to the measured release wave profiles; (10$$\bar{1}$$2) twinning due to its uni-directionality is not activated during release. The experimental results and wave profile simulations for a-axis Mg presented here are quite different from the previously published c-axis results, demonstrating the important role of crystal anisotropy on the time-dependent inelastic deformation of Mg single crystals under shock compression and release.
Authors:
 [1] ; ORCiD logo [1] ;  [1]
  1. Washington State Univ., Pullman, WA (United States)
Publication Date:
Grant/Contract Number:
NA0002007
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 3; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Research Org:
Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE
OSTI Identifier:
1342519
Alternate Identifier(s):
OSTI ID: 1361748

Renganathan, P., Winey, J. M., and Gupta, Y. M.. Shock compression and release of a-axis magnesium single crystals: Anisotropy and time dependent inelastic response. United States: N. p., Web. doi:10.1063/1.4974365.
Renganathan, P., Winey, J. M., & Gupta, Y. M.. Shock compression and release of a-axis magnesium single crystals: Anisotropy and time dependent inelastic response. United States. doi:10.1063/1.4974365.
Renganathan, P., Winey, J. M., and Gupta, Y. M.. 2017. "Shock compression and release of a-axis magnesium single crystals: Anisotropy and time dependent inelastic response". United States. doi:10.1063/1.4974365. https://www.osti.gov/servlets/purl/1342519.
@article{osti_1342519,
title = {Shock compression and release of a-axis magnesium single crystals: Anisotropy and time dependent inelastic response},
author = {Renganathan, P. and Winey, J. M. and Gupta, Y. M.},
abstractNote = {Here, to gain insight into inelastic deformation mechanisms for shocked hexagonal close-packed (hcp) metals, particularly the role of crystal anisotropy, magnesium (Mg) single crystals were subjected to shock compression and release along the a-axis to 3.0 and 4.8 GPa elastic impact stresses. Wave profiles measured at several thicknesses, using laser interferometry, show a sharply peaked elastic wave followed by the plastic wave. Additionally, a smooth and featureless release wave is observed following peak compression. When compared to wave profiles measured previously for c-axis Mg, the elastic wave amplitudes for a-axis Mg are lower for the same propagation distance, and less attenuation of elastic wave amplitude is observed for a given peak stress. The featureless release wave for a-axis Mg is in marked contrast to the structured features observed for c-axis unloading. Numerical simulations, using a time-dependent anisotropic modeling framework, showed that the wave profiles calculated using prismatic slip or (10$\bar{1}$2) twinning, individually, do not match the measured compression profiles for a-axis Mg. However, a combination of slip and twinning provides a good overall match to the measured compression profiles. In contrast to compression,prismatic slip alone provides a reasonable match to the measured release wave profiles; (10$\bar{1}$2) twinning due to its uni-directionality is not activated during release. The experimental results and wave profile simulations for a-axis Mg presented here are quite different from the previously published c-axis results, demonstrating the important role of crystal anisotropy on the time-dependent inelastic deformation of Mg single crystals under shock compression and release.},
doi = {10.1063/1.4974365},
journal = {Journal of Applied Physics},
number = 3,
volume = 121,
place = {United States},
year = {2017},
month = {1}
}