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

Abstract

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.

Authors:
 [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
Publication Date:
Research Org.:
Rice Univ., Houston, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1510131
Alternate Identifier(s):
OSTI ID: 1510478
Grant/Contract Number:  
FG02-13ER46967; SC0010688
Resource Type:
Published Article
Journal Name:
Materials Research Letters
Additional Journal Information:
Journal Name: Materials Research Letters Journal Volume: 6 Journal Issue: 1; Journal ID: ISSN 2166-3831
Publisher:
Informa UK Limited
Country of Publication:
United Kingdom
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; Nanotwin; nickel nanowire; nanomechanics; in situ TEM; molecular dynamics; simulation

Citation Formats

Wang, Binjun, Zhang, Hongti, Lou, Jun, and Lu, Yang. ‘Unzipping’ of twin lamella in nanotwinned nickel nanowires under flexural bending. United Kingdom: N. p., 2017. Web. doi:10.1080/21663831.2017.1383317.
Wang, Binjun, Zhang, Hongti, Lou, Jun, & Lu, Yang. ‘Unzipping’ of twin lamella in nanotwinned nickel nanowires under flexural bending. United Kingdom. doi:10.1080/21663831.2017.1383317.
Wang, Binjun, Zhang, Hongti, Lou, Jun, and Lu, Yang. Thu . "‘Unzipping’ of twin lamella in nanotwinned nickel nanowires under flexural bending". United Kingdom. doi:10.1080/21663831.2017.1383317.
@article{osti_1510131,
title = {‘Unzipping’ of twin lamella in nanotwinned nickel nanowires under flexural bending},
author = {Wang, Binjun and Zhang, Hongti and Lou, Jun and Lu, Yang},
abstractNote = {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.},
doi = {10.1080/21663831.2017.1383317},
journal = {Materials Research Letters},
number = 1,
volume = 6,
place = {United Kingdom},
year = {2017},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1080/21663831.2017.1383317

Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

Figures / Tables:

Figure 1 Figure 1: HRTEM images of Ni nanowire under low (a) and high (b) magnifications. Inset shows the diffraction pattern calculated by fast Fourier transform (FFT). Our nanowire has a <2 1 1> axial direction and contains {111} twin boundaries. (c) Experimental setup showing that the nanowire was clamped onto themore » tip left. (d) TEM images of the mechanical loading of the nanowire. The loading was performed by approaching the tip of STM sample holder to the nanowire. Inset: HRTEM image of the area in white frame. It can be well observed that the deformation consists both bending and compression. Scale bar (a) and (d) 50 nm; (b) 5 nm.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.