Shock compression of molybdenum single crystals to 110 GPa: Elastic–plastic deformation and crystal anisotropy

Abstract

To investigate the role of crystal anisotropy on the elastic-plastic deformation of BCC single crystals at high shock stresses, molybdenum (Mo) single crystals were shock compressed along the [100], [111], and [110] orientations at elastic impact stresses between 20 and 110 GPa. Laser interferometry was used to measure shock wave velocities and particle velocity histories. Along the [100] and [111] orientations, elastic-plastic waves (two wave structure) were observed up to 110 GPa. Along the [110] orientation, the two wave structure was observed only up to 90 GPa. The measured elastic wave amplitudes were analyzed to determine crystal anisotropy effects, impact stress dependence, and the activated slip systems on the Hugoniot elastic limit. The findings from our work have provided insight into the role of crystal anisotropy on the elastic-plastic deformation under shock compression at high stresses.

Peak states of molybdenum single crystals shock compressed to high stresses

“…We note that experimental parameters for experiments A1-A6, B1-B5, and C1-C3 listed in Table II were presented in Ref. 16. However, as noted above, the focus of our earlier work was entirely on elastic wave amplitudes and not on peak states.…”

“…1 and the experimental procedures used for this work were the same as described in Ref. 16. Hence, only a brief summary is presented here.…”

“…The sample orientations were within 1.5 as noted in Ref. 16. In each experiment, the particle velocity at the Mo sample-LiF window interface was measured using laser interferometry (Velocity Interferometer System for any Reflector, VISAR [21][22][23] ).…”

“…As discussed in Ref. 16, experiments A2 and A5 are excluded from further discussion due to the anomalous behavior observed at the elastic limit. In Fig.…”

“…To address this need, we previously reported on the role of crystal anisotropy on elastic-plastic deformation in molybdenum (Mo) single crystals shocked to 110 GPa along different crystal orientations. 16 The focus of our earlier work was on understanding the dependence of the elastic wave amplitude on peak stress (20 to 110 GPa) and on gaining insight into the slip systems activated for shock compression along different crystal orientations.…”