Effect of strain rate and dislocation density on the twinning behavior in tantalum

Florando, Jeffrey N.; El-Dasher, Bassem S.; Chen, Changqiang; Swift, Damian C.; Barton, Nathan R.; McNaney, James M.; Ramesh, K. T.; Hemker, Kevin J.; Kumar, Mukul

doi:10.1063/1.4948528

Title: Effect of strain rate and dislocation density on the twinning behavior in tantalum

Journal Article · Fri Apr 01 00:00:00 EDT 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4948528· OSTI ID:1249830

Florando, Jeffrey N.; El-Dasher, Bassem S.; Chen, Changqiang; Swift, Damian C.; Barton, Nathan R.; McNaney, James M.;

; Hemker, Kevin J.; Kumar, Mukul

The conditions which affect twinning in tantalum have been investigated across a range of strain rates and initial dislocation densities. Tantalum samples were subjected to a range of strain rates, from 10^–4/s to 10³/s under uniaxial stress conditions, and under laser-induced shock-loading conditions. In this study, twinning was observed at 77K at strain rates from 1/s to 103/s, and during laser-induced shock experiments. The effect of the initial dislocation density, which was imparted by deforming the material to different amounts of pre-strain, was also studied, and it was shown that twinning is suppressed after a given amount of pre-strain, even as the global stress continues to increase. These results indicate that the conditions for twinning cannot be represented solely by a critical global stress value, but are also dependent on the evolution of the dislocation density. Additionally, the analysis shows that if twinning is initiated, the nucleated twins may continue to grow as a function of strain, even as the dislocation density continues to increase.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396; AC52-07NA27344

OSTI ID:: 1249830

Alternate ID(s):: OSTI ID: 1256430; OSTI ID: 1421038

Report Number(s):: LLNL-JRNL-687200

Journal Information:: AIP Advances, Journal Name: AIP Advances Vol. 6 Journal Issue: 4; ISSN 2158-3226

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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