A tale of two mechanisms. Strain-softening versus strain-hardening in single crystals under small stressed volumes
Abstract
Pre-straining defect-free single crystals will introduce heterogeneous dislocation nucleation sources that reduce the measured strength from the theoretical value, while pre-straining bulk samples will lead to strain hardening. Their competition is investigated by nanoindentation pop-in tests on variously pre-strained Mo single crystals with several indenter radii (~micrometer). Pre-straining primarily shifts deformation mechanism from homogeneous dislocation nucleation to a stochastic behavior, while strain hardening plays a secondary role, as summarized in a master plot of pop-in strength versus normalized indenter radius.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1237145
- Alternate Identifier(s):
- OSTI ID: 1405563
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scripta Materialia
- Additional Journal Information:
- Journal Volume: 110; Journal ID: ISSN 1359-6462
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; nanoindentation pop-in; weakest link; strain hardening
Citation Formats
Bei, Hongbin, Xia, Yuzhi, Barabash, Rozaliya, and Gao, Y. F. A tale of two mechanisms. Strain-softening versus strain-hardening in single crystals under small stressed volumes. United States: N. p., 2015.
Web. doi:10.1016/j.scriptamat.2015.07.043.
Bei, Hongbin, Xia, Yuzhi, Barabash, Rozaliya, & Gao, Y. F. A tale of two mechanisms. Strain-softening versus strain-hardening in single crystals under small stressed volumes. United States. https://doi.org/10.1016/j.scriptamat.2015.07.043
Bei, Hongbin, Xia, Yuzhi, Barabash, Rozaliya, and Gao, Y. F. Mon .
"A tale of two mechanisms. Strain-softening versus strain-hardening in single crystals under small stressed volumes". United States. https://doi.org/10.1016/j.scriptamat.2015.07.043. https://www.osti.gov/servlets/purl/1237145.
@article{osti_1237145,
title = {A tale of two mechanisms. Strain-softening versus strain-hardening in single crystals under small stressed volumes},
author = {Bei, Hongbin and Xia, Yuzhi and Barabash, Rozaliya and Gao, Y. F.},
abstractNote = {Pre-straining defect-free single crystals will introduce heterogeneous dislocation nucleation sources that reduce the measured strength from the theoretical value, while pre-straining bulk samples will lead to strain hardening. Their competition is investigated by nanoindentation pop-in tests on variously pre-strained Mo single crystals with several indenter radii (~micrometer). Pre-straining primarily shifts deformation mechanism from homogeneous dislocation nucleation to a stochastic behavior, while strain hardening plays a secondary role, as summarized in a master plot of pop-in strength versus normalized indenter radius.},
doi = {10.1016/j.scriptamat.2015.07.043},
journal = {Scripta Materialia},
number = ,
volume = 110,
place = {United States},
year = {Mon Aug 10 00:00:00 EDT 2015},
month = {Mon Aug 10 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
Bending Nanoindentation and Plasticity Noise in FCC Single and Polycrystals
journal, December 2019
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Single versus successive pop-in modes in nanoindentation tests of single crystals
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