期刊
SCIENTIFIC REPORTS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-018-23015-z
关键词
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资金
- National Natural Science Foundation of China [51701179, 51771172, 11234011, 11327901]
- Chinese 1000-Youth-Talent Plan
- National Science Foundation through the University of Pittsburgh [NSF CMMI 1536811]
- Office of Basic Energy Sciences, US Department of Energy [DE-SC0010412]
- Fundamental Research Funds for the Central Universities [2017QNA4008]
- U.S. Department of Energy (DOE) [DE-SC0010412] Funding Source: U.S. Department of Energy (DOE)
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.
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