Tantalum single crystals were impacted along ,  and  using 1-D planar shock waves with pressures of 6.4 GPa, 15.4 GPa and 21.7 GPa. The defect structures generated have been characterised using scanning electron microscopy and transmission electron microscopy. Deformation twins were produced in the 15.4 GPa and 21.7 GPa shocked samples, but are not seen in the 6.4 GPa samples. The twinning types were found to be highly dependent on the orientation of the single crystals and to obey the Smith  model. The remaining shock-induced dislocation structure is largely random, presumably as a result of the release wave. The TEM observations also show evidence of surface relaxation.
Bibliographical noteFunding Information:
UK Ministry of Defence© Crown Owned Copyright 2020/AWE. Published with permission of the Controller of Her Britannic Majesty's Stationery Office. This document is of United Kingdom origin and contains proprietary information which is the property of the Secretary of State for Defence. It is furnished in confidence and may not be copied, used or disclosed in whole or in part without prior written consent of Defence Intellectual Property Rights DGDCDIPR-PL-Ministry of Defence, Abbey Wood, Bristol, BS34 8JH, England.
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering