Laser compression of nanocrystalline tantalum


Lu, C.-H., Maddox, B.R., Remington, B.A., Brigna, E.M., Kawasaki, M., Langdon, T.G., Park, H.-G., Kad, B. and Meyers, M.A. (2012) Laser compression of nanocrystalline tantalum. AIP Conference Proceedings, 1426, 1387-1390. (doi:10.1063/1.3686540).

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Description/Abstract

Nanocrystalline tantalum was prepared by high pressure torsion from monocrystalline [100] stock, yielding a grain size of 70nm. It was subjected to laser driven compression at energy levels of ~ 350 J to ~ 850 J in the Omega facility (LLE, U. of Rochester) with corresponding pressures as high as ~ 170 GPa. The laser beam created a crater of significant depth (~ 100 µm). Transmission electron microscopy (TEM) revealed dislocations in the grains but no twins in contrast with monocrystalline tantalum. Hardness measurements were conducted and show the same trend as single crystalline tantalum. The grain size was found to increase close to the energy deposition surface due to the thermomechanical excursion

Item Type: Article
Additional Information: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, 26 June–1 July 2011, Chicago, Illinois
ISSNs: 0094-243X (print)
1551-7616 (electronic)
Keywords: tantalum, nanocrystal, laser shock
Subjects: T Technology > TP Chemical technology
T Technology > TS Manufactures
Divisions: Faculty of Engineering and the Environment > Engineering Sciences > Engineering Materials Surface Engineering
ePrint ID: 340530
Date Deposited: 25 Jun 2012 11:18
Last Modified: 27 Mar 2014 20:23
URI: http://eprints.soton.ac.uk/id/eprint/340530

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