Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires
Abstract
Shear band in metallic crystals is localized deformation with high dislocation density, which is often observed in nanopillar deformation experiments. The shear band dynamics coupled with dislocation activities, however, remains unclear. Here, we investigate the dynamic processes of dislocation and shear band in body-centered cubic (BCC) tungsten nanowires via an integrated approach of in situ nanomechanical testing and atomistic simulation. We find a strong effect of surface orientation on dislocation nucleation in tungsten nanowires, in which {111} surfaces act as favorite sites under high strain. While dislocation activities in a localized region give rise to an initially thin shear band, self-catalyzed stress concentration and dislocation nucleation at shear band interfaces cause a discrete thickening of shear band. Our findings not only advance the current understanding of defect activities and deformation morphology of BCC nanowires, but also shed light on the deformation dynamics in other microscopic crystals where jerky motion of deformation band is observed.
- Authors:
-
- Zhejiang Univ., Hangzhou (China).
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Stanford Univ., CA (United States)
- Stanford Univ., CA (United States)
- Univ. of Pittsburgh, PA (United States)
- Publication Date:
- Research Org.:
- Stanford Univ., CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1500035
- Grant/Contract Number:
- SC0010412
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Wang, Jiangwei, Wang, Yanming, Cai, Wei, Li, Jixue, Zhang, Ze, and Mao, Scott X. Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires. United States: N. p., 2018.
Web. doi:10.1038/s41598-018-23015-z.
Wang, Jiangwei, Wang, Yanming, Cai, Wei, Li, Jixue, Zhang, Ze, & Mao, Scott X. Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires. United States. https://doi.org/10.1038/s41598-018-23015-z
Wang, Jiangwei, Wang, Yanming, Cai, Wei, Li, Jixue, Zhang, Ze, and Mao, Scott X. Thu .
"Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires". United States. https://doi.org/10.1038/s41598-018-23015-z. https://www.osti.gov/servlets/purl/1500035.
@article{osti_1500035,
title = {Discrete shear band plasticity through dislocation activities in body-centered cubic tungsten nanowires},
author = {Wang, Jiangwei and Wang, Yanming and Cai, Wei and Li, Jixue and Zhang, Ze and Mao, Scott X.},
abstractNote = {Shear band in metallic crystals is localized deformation with high dislocation density, which is often observed in nanopillar deformation experiments. The shear band dynamics coupled with dislocation activities, however, remains unclear. Here, we investigate the dynamic processes of dislocation and shear band in body-centered cubic (BCC) tungsten nanowires via an integrated approach of in situ nanomechanical testing and atomistic simulation. We find a strong effect of surface orientation on dislocation nucleation in tungsten nanowires, in which {111} surfaces act as favorite sites under high strain. While dislocation activities in a localized region give rise to an initially thin shear band, self-catalyzed stress concentration and dislocation nucleation at shear band interfaces cause a discrete thickening of shear band. Our findings not only advance the current understanding of defect activities and deformation morphology of BCC nanowires, but also shed light on the deformation dynamics in other microscopic crystals where jerky motion of deformation band is observed.},
doi = {10.1038/s41598-018-23015-z},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2018},
month = {Thu Mar 15 00:00:00 EDT 2018}
}
Web of Science
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Figures / Tables found in this record: