On the ultimate tensile strength of tantalum

Hahn, Eric N.; Germann, Timothy C.; Ravelo, Ramon; Hammerberg, James E.; Meyers, Marc A.

doi:10.1016/j.actamat.2016.12.033

On the ultimate tensile strength of tantalum

Journal Article · Tue Jan 10 00:00:00 EST 2017 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2016.12.033· OSTI ID:1462274

^[1]; Germann, Timothy C. ^[2]; Ravelo, Ramon ^[3]; Hammerberg, James E. ^[2]; Meyers, Marc A. ^[4]

Univ. of California, San Diego, CA (United States). Materials Science and Engineering Program; Los Alamos National Lab. (LANL), Los Alamos, NM (United States); The Regents of the Univ. of Calif.,U.C. San Diego
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Texas, El Paso, TX (United States). Physics Dept. and Materials Research Inst.
Univ. of California, San Diego, CA (United States). Materials Science and Engineering Program

Strain rate, temperature, and microstructure play a significant role in the mechanical response of materials. By using non-equilibrium molecular dynamics simulations, we characterize the ductile tensile failure of a model body-centered cubic metal, tantalum, over six orders of magnitude in strain rate. Molecular dynamics calculations combined with reported experimental measurements show power-law kinetic relationships that vary as a function of dominant defect mechanism and grain size. The maximum sustained tensile stress, or spall strength, increases with increasing strain rate, before ultimately saturating at ultra-high strain rates, i.e. those approaching or exceeding the Debye frequency. The upper limit of tensile strength can be well estimated by the cohesive energy, or the energy required to separate atoms from one another. At strain rates below the Debye frequency, the spall strength of nanocrystalline Ta is less than single crystalline tantalum. This occurs in part due to the decreased flow stress of the grain boundaries; stress concentrations at grain boundaries that arise due to compatibility requirements; and the growing fraction of grain-boundary atoms as grain size is decreased into the nanocrystalline regime. In the present cases, voids nucleate at defect structures present in the microstructure. The exact makeup and distribution of defects is controlled by the initial microstructure and the plastic deformation during both compression and expansion, where grain boundaries and grain orientation play critical roles.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: US Air Force Office of Scientific Research (AFOSR); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)

Grant/Contract Number:: AC52-06NA25396; NA0002080

OSTI ID:: 1462274

Alternate ID(s):: OSTI ID: 22647008
OSTI ID: 1397832

Report Number(s):: DE-UCSD--NA0002080; PII: S1359645416309703

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 126; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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