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Numerical exploration of plastic deformation mechanisms of copper nanowires with surface defects

Zhan, Haifei, Gu, YuanTong, Feng, XiQiao, & Yarlagadda, Prasad K. (2011) Numerical exploration of plastic deformation mechanisms of copper nanowires with surface defects. Computational Materials Science, 50(12), pp. 3425-3430.

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Abstract

Based on the molecular dynamics simulation, plastic deformation mechanisms associated with the zigzag stress curves in perfect and surface defected copper nanowires under uniaxial tension are studied. In our previous study, it has found that the surface defect exerts larger influence than the centro-plane defect, and the 45o surface defect appears as the most influential surface defect. Hence, in this paper, the nanowire with a 45o surface defect is chosen to investigate the defect’s effect to the plastic deformation mechanism of nanowires. We find that during the plastic deformation of both perfect and defected nanowires, decrease regions of the stress curve are accompanied with stacking faults generation and migration activities, but during stress increase, the structure of the nanowire appears almost unchanged. We also observe that surface defects have obvious influence on the nanowire’s plastic deformation mechanisms. In particular, only two sets of slip planes are found to be active and twins are also observed in the defected nanowire.

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11 citations in Scopus
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7 citations in Web of Science®

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ID Code: 45568
Item Type: Journal Article
Keywords: plastic deformation mechanism, defect, nanowire, molecular dynamics, numerical simulation
DOI: 10.1016/j.commatsci.2011.07.004
ISSN: 0927-0256
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Materials Engineering not elsewhere classified (091299)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Numerical Modelling and Mechanical Characterisation (091307)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2011 Elsevier B.V.
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Computational Materials Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Computational Materials Science, [Volume 50, Issue 12, (December 2011)] DOI: 10.1016/j.commatsci.2011.07.004
Deposited On: 30 Aug 2011 07:50
Last Modified: 12 Sep 2013 21:36

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