Plastic anisotropy and dislocation trajectory in BCC metals

Lucile Dezerald (), David Rodney, Emmanuel Clouet, Lisa Ventelon and François Willaime
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Lucile Dezerald: DEN-Service de Recherches de Métallurgie Physique, CEA, Université Paris-Saclay
David Rodney: Institut Lumière Matière, Université Lyon 1 - CNRS
Emmanuel Clouet: DEN-Service de Recherches de Métallurgie Physique, CEA, Université Paris-Saclay
Lisa Ventelon: DEN-Service de Recherches de Métallurgie Physique, CEA, Université Paris-Saclay
François Willaime: CEA, Université Paris-Saclay

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Plasticity in body-centred cubic (BCC) metals at low temperatures is atypical, marked in particular by an anisotropic elastic limit in clear violation of the famous Schmid law applicable to most other metals. This effect is known to originate from the behaviour of the screw dislocations; however, the underlying physics has so far remained insufficiently understood to predict plastic anisotropy without adjustable parameters. Here we show that deviations from the Schmid law can be quantified from the deviations of the screw dislocation trajectory away from a straight path between equilibrium configurations, a consequence of the asymmetrical and metal-dependent potential energy landscape of the dislocation. We propose a modified parameter-free Schmid law, based on a projection of the applied stress on the curved trajectory, which compares well with experimental variations and first-principles calculations of the dislocation Peierls stress as a function of crystal orientation.

Date: 2016
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DOI: 10.1038/ncomms11695

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