Incipient plasticity of single-crystal tantalum as a function of temperature and orientation

Franke, O.; Alcalá, J.; Dalmau, R.; Duan, Zhi Chao; Biener, J.; Biener, M. M.; Hodge, Andrea M.

doi:10.1080/14786435.2014.949324

Title: Incipient plasticity of single-crystal tantalum as a function of temperature and orientation

Journal Article · Thu Aug 28 00:00:00 EDT 2014 · Philosophical Magazine (2003, Print)

DOI:https://doi.org/10.1080/14786435.2014.949324· OSTI ID:1324509

Franke, O. ^[1]; Alcalá, J. ^[2]; Dalmau, R. ^[2]; Duan, Zhi Chao ^[1]; Biener, J. ^[3]; Biener, M. M. ^[4]; Hodge, Andrea M. ^[1]

Univ. of Southern California, Los Angeles, CA (United States)
Univ. Politecnica de Catalunya, Barcelona (Spain)
Univ. of Southern California, Los Angeles, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The nanocontact plastic behavior of single-crystalline Ta (1 0 0), Ta (1 1 0) and Ta (1 1 1) was studied as a function of temperature and indentation rate. Tantalum, a representative body centred cubic (BCC) metal, reveals a unique deformation behavior dominated by twinning and the generation of stacking faults. Experiments performed at room temperature exhibit a single pop-in event, while at 200 °C, above the critical temperature, a transition to multiple pop-ins was observed. The experimental results are discussed with respect to the orientation as well as temperature and correlated to the defect structures using both anisotropic finite element and MD simulations. In addition, the serrated flow observed at 200 °C is related to differences in the quasi-elastic reloading originating from changes in the defect mechanism.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1324509

Report Number(s):: LLNL-JRNL-694601

Journal Information:: Philosophical Magazine (2003, Print), Vol. 95, Issue 16-18; ISSN 1478-6435

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Temperature-dependent nanoindentation response of materials Chavoshi, Saeed Zare; Xu, Shuozhi MRS Communications, Vol. 8, Issue 01 https://doi.org/10.1557/mrc.2018.19	journal	February 2018
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nanomechanics
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Title: Incipient plasticity of single-crystal tantalum as a function of temperature and orientation

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