Bending-induced deformation twinning in body-centered cubic tungsten nanowires. Issue 5 (4th May 2019)

• Record Type: Journal Article
• Authors: Wei, Siyuan; Wang, Qiannan; Wei, Hua; Wang, Jiangwei
• Is Part Of: Materials research letters. Volume 7:Issue 5(2019)
• Page Start: 210
• Page End: 216
• Publication Date: 2019-05-04
• Subjects: Bending -- body-centered cubic -- twinning -- dislocation -- tungsten nanowire; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2019.1578833
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: The competition between dislocation slip and deformation twinning in body-centered cubic (BCC) nanocrystals can be strongly influenced by the deformation conditions. In this study, we investigate the deformation of [112]-oriented BCC tungsten nanowires under different loading modes. It shows that dislocation plasticity is a predominant deformation mode under uniaxial tension, while deformation twinning prevails when non-uniaxial stress is applied. The interfaces of bending-induced twinning are composed of numerous stepwise {112} twin boundaries. These findings shed light on the deformation mechanism of BCC nanocrystals under complex loading conditions. GRAPHICAL ABSTRACT: IMPACT STATEMENT: In situ nanomechanical testing and quantitative analysis reveal a deformation mechanism transition in tungsten nanowires, from dislocation slip under the uniaxial loading to deformation twinning under the non-uniaxial loading.