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Title: ‘Unzipping’ of twin lamella in nanotwinned nickel nanowires under flexural bending

Journal Article · · Materials Research Letters
 [1];  [2];  [3]; ORCiD logo [2]
  1. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, People’s Republic of China, School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, People’s Republic of China
  2. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, People’s Republic of China, Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), Hong Kong, People’s Republic of China, Centre for Advanced Structural Materials (CASM), Shenzhen Research Institute, City University of Hong Kong, Shenzhen, People’s Republic of China
  3. Department of Materials Science and Nano-Engineering, Rice University, Houston, TX, USA

We report the fabrication of nickel nanowires with parallel growth-twin structures (‘twin lamella’ along the wire axis) by electrochemical deposition, and demonstrate an interesting twin ‘unzipping’ phenomenon in such nanotwinned nanowires under bending. Through in situ TEM, we found that ‘unzipping’ of twin lamella was achieved by gradually increasing twin spacing along the wire axis via a layer-by-layer twin boundary migration process. Molecular dynamics simulations suggest that partial dislocation slip is responsible for activating the ‘unzipping’, with a multi-step-process involving dislocation loop initiation, expansion and partially annihilation. Our work could provide new insights into the deformation mechanisms of nanotwinned 1-D metallic nanostructures.

Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-13ER46967; SC0010688
OSTI ID:
1510131
Alternate ID(s):
OSTI ID: 1510478
Journal Information:
Materials Research Letters, Journal Name: Materials Research Letters Vol. 6 Journal Issue: 1; ISSN 2166-3831
Publisher:
Informa UK LimitedCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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