Journal article
In situ atomic-scale observation of twinning-dominated deformation in nanoscale body-centred cubic tungsten
Nature materials, v 14(6), pp 594-600
01 Jun 2015
PMID: 25751073
Abstract
Twinning is a fundamental deformation mode that competes against dislocation slip in crystalline solids. In metallic nanostructures, plastic deformation requires higher stresses than those needed in their bulk counterparts, resulting in the 'smaller is stronger' phenomenon. Such high stresses are thought to favour twinning over dislocation slip. Deformation twinning has been well documented in face-centred cubic (FCC) nanoscale crystals. However, it remains unexplored in body-centred cubic (BCC) nanoscale crystals. Here, by using in situ high-resolution transmission electron microscopy and atomistic simulations, we show that twinning is the dominant deformation mechanism in nanoscale crystals of BCC tungsten. Such deformation twinning is pseudoelastic, manifested through reversible detwinning during unloading. We find that the competition between twinning and dislocation slip can be mediated by loading orientation, which is attributed to the competing nucleation mechanism of defects in nanoscale BCC crystals. Our work provides direct observations of deformation twinning as well as new insights into the deformation mechanism in BCC nanostructures.
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Details
- Title
- In situ atomic-scale observation of twinning-dominated deformation in nanoscale body-centred cubic tungsten
- Creators
- Jiangwei Wang - University of PittsburghZhi Zeng - Georgia Institute of TechnologyChristopher R. Weinberger - Sandia National Laboratories CaliforniaZe Zhang - Zhejiang UniversityTing Zhu - Georgia Institute of TechnologyScott X. Mao - University of Pittsburgh
- Publication Details
- Nature materials, v 14(6), pp 594-600
- Publisher
- Springer Nature
- Number of pages
- 7
- Grant note
- DMR-1410331 / NSF; National Science Foundation (NSF) DE-AC04-94AL85000 / Sandia Corporation (a wholly owned subsidiary of Lockheed Martin Corporation) under its US Department of Energy Sandia National Lab; United States Department of Energy (DOE) 1410331 / Division Of Materials Research; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) HPC resources in CAS Shenyang Supercomputing Centre CMMI 08 010934 / NSF through University of Pittsburgh DE-AC07-05ID14517 / DOE NEUP; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Web of Science ID
- WOS:000354801500022
- Scopus ID
- 2-s2.0-84929957403
- Other Identifier
- 991019350585404721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter