Multi-megabar Dynamic Strength Measurements of Ta, Au, Pt, and Ir

Brown, J. L.; Davis, J. -P.; Seagle, C. T.

doi:10.1007/s40870-020-00256-6

Title: Multi-megabar Dynamic Strength Measurements of Ta, Au, Pt, and Ir

Journal Article · 28 August 2020 · Journal of Dynamic Behavior of Materials

DOI: https://doi.org/10.1007/s40870-020-00256-6 · OSTI ID:1651213

^[1]; Davis, J. -P. ^[1]; Seagle, C. T. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Magnetic loading was used to shocklessly compress four different metals to extreme pressures. Velocimetry monitored the behavior of the material as it was loaded to a desired peak state and then decompressed back down to lower pressures. Two distinct analysis methods, including a wave profile analysis and a novel Bayesian calibration approach, were employed to estimate quantitative strength metrics associated with the loading reversal. Specifically, we report for the first time on strength estimates for tantalum, gold, platinum, and iridium under shockless compression at strain rates of \(\sim 5 \times 10^5\)/s in the pressure range of \(\sim \) 100–400 GPa. The magnitude of the shear stresses supported by the different metals under these extreme conditions are surprisingly similar, representing a dramatic departure from ambient conditions.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525; NA-0003525

OSTI ID:: 1651213

Alternate ID(s):: OSTI ID: 1667426

Report Number(s):: SAND-2020-9294J; 690362

Journal Information:: Journal of Dynamic Behavior of Materials, Vol. 7, Issue 2; ISSN 2199-7446

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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