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Modelling the strength of ultrafine-grained and nanocrystalline fcc metals

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<mark>Journal publication date</mark>12/2009
<mark>Journal</mark>Scripta Materialia
Issue number12
Volume61
Number of pages4
Pages (from-to)1113-1116
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A model for predicting the steady-state flow stress in ultrafine-grained and nanocrystalline face-centred cubic metals based on irreversible thermodynamics is presented. Grain size, temperature and strain-rate effects are incorporated. Nanoscale effects are accounted for via dislocation propagation and annihilation mechanisms invoking an Orowan-type dislocation glide mechanism, and a vacancy-mediated annihilation mechanism at the interface, respectively. Model predictions show good agreement with experiments for pure Cu and Al.