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Title: Shock compression/release of magnesium single crystals along a low-symmetry orientation: Role of basal slip

Abstract

To gain insight into the relative contributions of different plastic deformation mechanisms, particularly basal slip, for shocked hexagonal close-packed (hcp) metals, magnesium (Mg) single crystals were subjected to shock compression and release along a low-symmetry (LS) orientation to 1.9 and 4.8 GPa elastic impact stresses. LS-axis is a “non-specific” direction resulting in propagation of quasi-longitudinal and quasi-shear waves. Wave profiles, measured using laser interferometry, show a small elastic wave followed by two plastic waves in compression; release wave profiles exhibited a structured response for the higher stress and a smooth response for the lower stress. The LS-axis wave profiles are significantly different than profiles published previously for c- and a-axes, demonstrating that Mg single crystals exhibit strong anisotropy under shock compression/release. Numerical simulations, using a time-dependent anisotropic modeling framework, show that shock wave loading along the LS-axis involves simultaneous operation of multiple deformation mechanisms. Shock compression along LS-axis is dominated by basal slip while prismatic and pyramidal I {$$10\bar{1}1$$} $$\langle$$ $$11\bar{2}3$$ $$\rangle$$ slip play a smaller role; coupling between longitudinal and shear deformations was observed. The unloading response is dominated by basal slip with some contribution from prismatic slip; pyramidal I slip is not activated. The present results, unlike results obtained for c- and a-axes, show that the deformation mechanism observed under quasi-static loading conditions along LS-axis is not sufficient to determine shock response along this orientation. Finally, although requiring numerical simulations for wave analysis, shock propagation along a LS orientation provides new insights into the plastic deformation response of hcp metal single crystals.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics
  2. Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics; Washington State Univ., Pullman, WA (United States). Dept. of Physics and Astronomy
Publication Date:
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)
OSTI Identifier:
1574246
Alternate Identifier(s):
OSTI ID: 1562175
Grant/Contract Number:  
NA0002007; #DE-NA0002007
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 126; Journal Issue: 11; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Renganathan, P., and Gupta, Y. M. Shock compression/release of magnesium single crystals along a low-symmetry orientation: Role of basal slip. United States: N. p., 2019. Web. doi:10.1063/1.5116822.
Renganathan, P., & Gupta, Y. M. Shock compression/release of magnesium single crystals along a low-symmetry orientation: Role of basal slip. United States. doi:10.1063/1.5116822.
Renganathan, P., and Gupta, Y. M. Mon . "Shock compression/release of magnesium single crystals along a low-symmetry orientation: Role of basal slip". United States. doi:10.1063/1.5116822.
@article{osti_1574246,
title = {Shock compression/release of magnesium single crystals along a low-symmetry orientation: Role of basal slip},
author = {Renganathan, P. and Gupta, Y. M.},
abstractNote = {To gain insight into the relative contributions of different plastic deformation mechanisms, particularly basal slip, for shocked hexagonal close-packed (hcp) metals, magnesium (Mg) single crystals were subjected to shock compression and release along a low-symmetry (LS) orientation to 1.9 and 4.8 GPa elastic impact stresses. LS-axis is a “non-specific” direction resulting in propagation of quasi-longitudinal and quasi-shear waves. Wave profiles, measured using laser interferometry, show a small elastic wave followed by two plastic waves in compression; release wave profiles exhibited a structured response for the higher stress and a smooth response for the lower stress. The LS-axis wave profiles are significantly different than profiles published previously for c- and a-axes, demonstrating that Mg single crystals exhibit strong anisotropy under shock compression/release. Numerical simulations, using a time-dependent anisotropic modeling framework, show that shock wave loading along the LS-axis involves simultaneous operation of multiple deformation mechanisms. Shock compression along LS-axis is dominated by basal slip while prismatic and pyramidal I {$10\bar{1}1$} $\langle$ $11\bar{2}3$ $\rangle$ slip play a smaller role; coupling between longitudinal and shear deformations was observed. The unloading response is dominated by basal slip with some contribution from prismatic slip; pyramidal I slip is not activated. The present results, unlike results obtained for c- and a-axes, show that the deformation mechanism observed under quasi-static loading conditions along LS-axis is not sufficient to determine shock response along this orientation. Finally, although requiring numerical simulations for wave analysis, shock propagation along a LS orientation provides new insights into the plastic deformation response of hcp metal single crystals.},
doi = {10.1063/1.5116822},
journal = {Journal of Applied Physics},
number = 11,
volume = 126,
place = {United States},
year = {2019},
month = {9}
}

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