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    Constitutive modeling of stress-driven grain growth in nanocrystalline metals

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    Type
    Article
    Authors
    Gürses, Ercan
    Wafai, Husam cc
    El Sayed, Tamer S.
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Physical Sciences and Engineering (PSE) Division
    Date
    2013-02-08
    Permanent link to this record
    http://hdl.handle.net/10754/594162
    
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    Abstract
    In this work, we present a variational multiscale model for grain growth in face-centered cubic nanocrystalline (nc) metals. In particular, grain-growth-induced stress softening and the resulting relaxation phenomena are addressed. The behavior of the polycrystal is described by a conventional Taylor-type averaging scheme in which the grains are treated as two-phase composites consisting of a grain interior phase and a grain boundary-affected zone. Furthermore, a grain-growth law that captures the experimentally observed characteristics of the grain coarsening phenomena is proposed. To this end, the grain size is not taken as constant and varies according to the proposed stress-driven growth law. Several parametric studies are conducted to emphasize the influence of the grain-growth rule on the overall macroscopic response. Finally, the model is shown to provide a good description of the experimentally observed grain-growth-induced relaxation in nc-copper. © 2013 IOP Publishing Ltd.
    Citation
    Gürses E, Wafai H, Sayed TE (2013) Constitutive modeling of stress-driven grain growth in nanocrystalline metals. Modelling Simul Mater Sci Eng 21: 025011. Available: http://dx.doi.org/10.1088/0965-0393/21/2/025011.
    Sponsors
    This work was funded by KAUST baseline funds.
    Publisher
    IOP Publishing
    Journal
    Modelling and Simulation in Materials Science and Engineering
    ISSN
    0965-0393
    1361-651X
    DOI
    10.1088/0965-0393/21/2/025011
    ae974a485f413a2113503eed53cd6c53
    10.1088/0965-0393/21/2/025011
    Scopus Count
    Collections
    Articles; Physical Sciences and Engineering (PSE) Division; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

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