Elastic-plastic deformation of molybdenum single crystals shocked along [100]

Mandal, A.; Gupta, Y. M.

doi:10.1063/1.4974475

Elastic-plastic deformation of molybdenum single crystals shocked along [100]

Journal Article · Tue Jan 24 00:00:00 EST 2017 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4974475· OSTI ID:1342518

^[1]; Gupta, Y. M. ^[2]

Washington State Univ., Pullman, WA (United States); Institute for Shock Physics/Washington State University
Washington State Univ., Pullman, WA (United States)

To understand the elastic-plastic deformation response of shock-compressed molybdenum (Mo) – a body-centered cubic (BCC) metal, single crystal samples were shocked along the [100] crystallographic orientation to an elastic impact stress of 12.5 GPa. Elastic-plastic wave profiles, measured at different propagation distances ranging between ~0.23 to 2.31 mm using laser interferometry, showed a time-dependent material response. Within experimental scatter, the measured elastic wave amplitudes were nearly constant over the propagation distances examined. These data point to a large and rapid elastic wave attenuation near the impact surface, before reaching a threshold value (elastic limit) of ~3.6 GPa. Numerical simulations of the measured wave profiles, performed using a dislocation-based continuum model, suggested that {110}<111> and/or {112}<111> slip systems are operative under shock loading. In contrast to shocked metal single crystals with close-packed structures, the measured wave profiles in Mo single crystals could not be explained in terms of dislocation multiplication alone. A dislocation generation mechanism, operative for shear stresses larger than that at the elastic limit, was required to model the rapid elastic wave attenuation and to provide a good overall match to the measured wave profiles. However, the physical basis for this mechanism was not established for the high-purity single crystal samples used in this study. As a result, the numerical simulations also suggested that Mo single crystals do not work harden significantly under shock loading in contrast to the behavior observed under quasi-static loading.

View Accepted Manuscript (DOE)

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) (NA-10)

Grant/Contract Number:: NA0002007

OSTI ID:: 1342518

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 121; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Shock compression/release of magnesium single crystals along a low-symmetry orientation: Role of basal slip Renganathan, P.; Gupta, Y. M. Journal of Applied Physics, Vol. 126, Issue 11 https://doi.org/10.1063/1.5116822	journal	September 2019

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