Estimates of Ta strength at ultrahigh pressures and strain rates using thin-film graded-density impactors

Brown, J. L.; Adams, D. P.; Alexander, C. S.; Wise, J. L.; Prime, M. B.

doi:10.1103/physrevb.99.214105

Estimates of Ta strength at ultrahigh pressures and strain rates using thin-film graded-density impactors

Journal Article · Sat Jun 01 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.99.214105· OSTI ID:1639085

Brown, J. L. ^[1]; Adams, D. P. ^[1]; Alexander, C. S. ^[1]; Wise, J. L. ^[1]; Prime, M. B. ^[2]

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

In this paper, we present results from an experimental technique used to estimate the strength of Ta at extreme pressures (150 GPa) and strain rates (10⁷s^-1). A graded-density impactor (GDI) was fabricated using sputter deposition to produce an approximately 40-μm-thick film containing alternating layers of Al and Cu. The thicknesses of the respective layers are adjusted to give an effective density gradient through the film. The GDIs were launched with a 2-stage light gas gun, and shock-ramp-release velocity profiles were measured over timescales of ~10 ns. Results are presented for the direct impact of the film onto LiF windows, which allows for a dynamic characterization of the GDI, as well as from impact onto thin (~40μm) sputtered Ta samples backed by a LiF window. The measurements were coupled with mesoscale numerical simulations to infer the strength of Ta, and the results agree well with other high-pressure platforms, particularly when strain-rate, microstructural, and thermodynamic-path differences are considered.

View Accepted Manuscript (DOE)

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

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

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

OSTI ID:: 1639085

Alternate ID(s):: OSTI ID: 1601092
OSTI ID: 1546238

Report Number(s):: SAND--2020-6752J; 687077

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 21 Vol. 99; ISSN 2469-9969; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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