Actions for Effect of strain rate and dislocation density on the twinning behavior in Tantalum [electronic resource].

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Effect of strain rate and dislocation density on the twinning behavior in Tantalum [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 045,120 : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
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.
Report Numbers
E 1.99:llnl-jrnl--687200
llnl-jrnl--687200
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Note
Published through SciTech Connect.
04/28/2016.
"llnl-jrnl--687200"
AIP Advances 6 4 ISSN 2158-3226; AAIDBI AM
Jeffrey N. Florando; Bassem S. El-Dasher; Changqiang Chen; Daniel C. Swift; Nathan R. Barton; James M. McNaney; K. T. Ramesh; Kevin J. Hemker; Mukul Kumar.
Funding Information
AC52-07NA27344
View MARC record | catkey: 23759040