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Title: A tale of two mechanisms. Strain-softening versus strain-hardening in single crystals under small stressed volumes

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:
 [1] ;  [2] ;  [1] ;  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 110; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
nanoindentation pop-in; weakest link; strain hardening
OSTI Identifier:
1237145
Alternate Identifier(s):
OSTI ID: 1405563

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., 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. doi:10.1016/j.scriptamat.2015.07.043.
Bei, Hongbin, Xia, Yuzhi, Barabash, Rozaliya, and Gao, Y. F.. 2015. "A tale of two mechanisms. Strain-softening versus strain-hardening in single crystals under small stressed volumes". United States. doi: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 = {2015},
month = {8}
}