期刊
SCRIPTA MATERIALIA
卷 110, 期 -, 页码 48-52出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2015.07.043
关键词
Nanoindentation pop-in; Weakest link; Strain hardening
类别
资金
- U.S. Department of Energy, Office of Sciences, Basic Energy Science, Materials Science and Engineering Division
- U.S. Department of Energy, Office of Science, Basic Energy Science, Scientific Users Facilities Division
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 (similar to 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. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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