Tantalum sound velocity under shock compression

Creators: Akin, Minta C.; Nguyen, Jeffrey H.; Beckwith, Martha A.; Chau, Ricky; Ambrose, W. Patrick; Fat'yanov, Oleg V.; Asimow, Paul D.; Holmes, Neil C.

Abstract

We used several variations of the shock compression method to measure the longitudinal sound velocity of shocked tantalum over the pressure range 37–363 GPa with a typical uncertainty of 1.0%%. These data are consistent with Ta remaining in the bcc phase along the principal Hugoniot from ambient pressure to ≈300 GPa, at which pressure melting occurs. These data also do not support the putative melting phenomena reported below 100 GPa in some static compression experiments.

Additional Information

© 2019 Published under license by AIP Publishing. Submitted: 30 August 2018; Accepted: 21 March 2019; Published Online: 11 April 2019. We thank P. Rigg, P. Söderlind, and J. Klepeis for useful discussions, and the editors and reviewers for their work to improve this paper. We thank Papo Gelle, Mike Long, Russ Oliver, Mike Burns, Toni Bulai, Bob Nafzinger, Paul Benevento, Sam Weaver, and Cory McLean for their excellent and dedicated work. Lawrence Livermore National Laboratory is operated by Lawrence Livermore National Security, LLC, for the U.S. Department of Energy, National Nuclear Security Administration under Contract No. DE-AC52-07NA27344.

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