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Advanced numerical characterization of mono-crystalline copper with defects

Zhan, Haifei, Gu, YuanTong, & Yarlagadda, Prasad K. (2011) Advanced numerical characterization of mono-crystalline copper with defects. Advanced Science Letters, 4(4-5), pp. 1293-1301.

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    Abstract

    Based on the embedded atom method (EAM) and molecular dynamics (MD) method, the mono-crystalline copper with different defects is investigated through tension and nanoindentation simulation. The single-crystal copper nanowire with surface defects is firstly studied through tension. For validation, the tension simulations for nanowire without defect are carried out under different temperatures and strain rates. The defects on nanowires are then systematically studied in considering different defects orientation distribution. It is found that the Young’s modulus is insensitive of surface defects and centro-plane defects. However, the yield strength and yield point show a significant decrease due to the different defects. Specially, the 〖45〗^° defect in surface and in (200) plane exerts the biggest influence to the yield strength, about 34.20% and 51.45% decrease are observed, respectively. Different defects are observed to serve as a dislocation source and different necking positions of the nanowires during tension are found. During nanoindentation simulation, dislocation is found nucleating below the contact area, but no obvious dislocation is generated around the nano-cavity. Comparing with the perfect substrate during nanoindentation, the substrate with nano-cavities emerged less dislocations, it is supposed that the nano-cavity absorbed part of the indent energy, and less plastic deformation happened in the defected substrate.

    Impact and interest:

    7 citations in Scopus
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    5 citations in Web of Science®

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    ID Code: 45622
    Item Type: Journal Article
    Keywords: Nanotechnology, Nanowire, Molecular dynamics, Defect, Copper
    DOI: 10.1166/asl.2011.1496
    ISSN: 1936-6612
    Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200)
    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 American Scientific Publishers
    Deposited On: 31 Aug 2011 08:33
    Last Modified: 06 Jun 2013 18:06

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