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Modelling steady state deformation of fee metals by non-equilibrium thermodynamics

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
<mark>Journal publication date</mark>1/09/2007
<mark>Journal</mark>Materials Science and Technology
Issue number9
Volume23
Number of pages4
Pages (from-to)1105-1108
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The steady state of plastic deformation is modelled by non-equilibrium thermodynamics theory. Based on energy conservation and constant entropy requirements at the steady state, the saturation dislocation density p is found to be determined by ρ=λε̇/(bvc), where λ is a constant that depends on the material properties, ε̇ is the strain rate, b is the magnitude of Burgers vector and vc is the dislocation climb velocity along the dislocation line. Then, by employing the Taylor relation, the saturation flow stress is obtained. The model is applied to four pure fee single crystals under tensile testing and polycrystalline Al at steady state creep. The predictions are in good agreement with the experimental observations.