Shock compression/release of magnesium single crystals along a low-symmetry orientation: Role of basal slip
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.
- Research Organization:
- Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
- Grant/Contract Number:
- NA0002007
- OSTI ID:
- 1574246
- Alternate ID(s):
- OSTI ID: 1562175
- Journal Information:
- Journal of Applied Physics, Vol. 126, Issue 11; ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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