Journal article
On the kinking nonlinear elastic deformation of cobalt
Materials science & engineering. A, Structural materials : properties, microstructure and processing, v 527(18-19), pp 4664-4673
15 Jul 2010
Abstract
Recently cobalt was classified as a kinking nonlinear elastic, KNE, solid. Fully reversible incipient kink bands, IKBs, were invoked to explain both its microyielding and hysteretic stress-strain curves. Herein we present further evidence and insights in the KNE nature of cobalt by measuring its mechanical hysteresis as a function of grain size, pre-strain and testing temperature. Unlike previous work, in coarse-grained cobalt, something other than grain boundaries determine the domain size. The hysteresis loops were only obtained at temperatures where cobalt was hexagonal-close packed. In situ neutron diffraction strains could only account for approximate to 1/3 of the total strain measured and ruled out dislocation pileups as the source of the remaining strain suggesting that it is due to IKBs. The totality of our results can be successfully explained and quantified by our microscale IKB-based model, based on which we estimate the critical resolved shear stress of basal plane dislocations to be 13 +/- 3 MPa and the reversible dislocation density to be 1.5-6 x 10(13) m(-2) in the approximate to 200-400MPa stress range. (C) 2010 Elsevier BM. All rights reserved.
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Details
- Title
- On the kinking nonlinear elastic deformation of cobalt
- Creators
- A. G. Zhou - Drexel UniversityD. Brown - Los Alamos National LaboratoryS. Vogel - Los Alamos National LaboratoryO. Yeheskel - Drexel UniversityM. W. Barsoum - Drexel University
- Publication Details
- Materials science & engineering. A, Structural materials : properties, microstructure and processing, v 527(18-19), pp 4664-4673
- Publisher
- Elsevier
- Number of pages
- 10
- Grant note
- SGER 0736218 / Metals Division of NSF DAAD19-03-1-0213 / ARO
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]; Materials Science and Engineering
- Web of Science ID
- WOS:000279300900020
- Scopus ID
- 2-s2.0-77955982086
- Other Identifier
- 991019168513504721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Metallurgy & Metallurgical Engineering
- Nanoscience & Nanotechnology