材料科学技术(英文版)2022，Vol.106Issue(11) ：33-40.

Discrete twinning dynamics and size-dependent dislocation-to twin transition in body-centred cubic tungsten

Jiangwei Wang Anik H.M.Faisal Xiyao Li Youran Hong Qi Zhu Hongbin Bei Ze Zhang Scott X Mao Christopher R.Weinberger
材料科学技术(英文版)2022，Vol.106Issue(11) ：33-40.
✕
  • NETL
  • NSTL
  • 维普
  • 万方数据

Discrete twinning dynamics and size-dependent dislocation-to twin transition in body-centred cubic tungsten

Jiangwei Wang 1Anik H.M.Faisal 2Xiyao Li 3Youran Hong 3Qi Zhu 3Hongbin Bei 4Ze Zhang 3Scott X Mao 5Christopher R.Weinberger2
扫码查看

作者信息

  • 1. Center of Electron Microscopy and State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China;Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials,Institute of Wenzhou,Zhejiang University,Wenzhou 325006,China
  • 2. Department of Mechanical Engineering,Colorado State University,CO 80523,USA
  • 3. Center of Electron Microscopy and State Key Laboratory of Silicon Materials,School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China
  • 4. School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China
  • 5. Department of Mechanical Engineering and Materials Science,University of Pittsburgh,Pittsburgh,PA 15261,USA
  • 折叠

Abstract

Body-centred cubic(BCC)metals are known to have unstable intrinsic stacking faults and high resis-tance to deformation twinning,which can strongly influence their twinning behaviour.Though twinning mechanisms of BCC metals have been investigated for more than 60 years,the atomistic level dynam-ics of twinning remains under debate,especially regarding its impact on competition between twinning and slip.Here,we investigate the atomistic level dynamics of twinning in BCC tungsten(W)nanowires using in situ nanomechanical testing.Quantitative experimental studies directly visualize that deforma-tion twins in W nanowires have a minimum size of six-layers and grow in increments of approximately three-layers at a time,in contrast to the layer-by-layer growth of deformation twins in face-centred cu-bic metals.These unique twinning dynamics induces a strong competition with ordinary dislocation slip,as exhibited by a size-dependent dislocation-to-twin transition in W nanowires,with a transition size of～40 nm.Our work provides physical insight into the dynamics of twinning at the atomic level,as well as a size-dependent dislocation-twinning competition,which have important implications for the plastic deformation in a broad class of BCC metals and alloys.

Key words

Body-centred cubic/Deformation twin/Twinning dynamics/Dislocation-to-twin transition In situ nanomechanical testing

引用本文复制引用

基金项目

National Natural Sci-ence Foundation of China(51701179)

National Natural Sci-ence Foundation of China(51771172)

National Natural Sci-ence Foundation of China(52071284)

Innovation Fund of the Zhejiang Kechuang New Materi-als Research Institute(N00014-17-1-2810)

Innovation Fund of the Zhejiang Kechuang New Materi-als Research Institute(N00014-20-1-2788)

出版年

2022
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI
影响因子：0.657
ISSN：1005-0302
参考文献量52
段落导航相关论文