Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 21, Issue 1, Pages 67-82Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2004.02.002
Keywords
nanocrystalline materials; homogenization; composite materials; Hall-Petch
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Homogenization techniques are used for modeling the so-called breakdown of the Hall-Petch law in the case of nanocrystalline (NC) materials. In this paper, the NC material is modeled as a composite material composed of two phases: the grain core (inclusion) and the grain boundaries (matrix). The deformation of the inclusion phase has a viscoplastic component that takes into account the dislocation glide mechanism as well as Coble creep. The boundary phase is modeled as an amorphous material with a perfect elastic-plastic behavior. An application of the model is developed on pure copper under tensile load. The results are compared with various experimental data. (C) 2004 Elsevier Ltd. All rights reserved.
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