Journal
ACTA MATERIALIA
Volume 85, Issue -, Pages 53-66Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.10.044
Keywords
Solid-solution strengthening; DFT; Peierls-Nabarro model; Ab initio; Al alloys
Funding
- Academy of Sciences of the Czech Republic through the Fellowship of Jan Evangelista Purkyne
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We propose an approach for the computationally efficient and quantitatively accurate prediction of solid-solution strengthening. It combines the 2-D Peierls-Nabarro model and a recently developed solid-solution strengthening model. Solid-solution strengthening is examined with Al-Mg and Al-Li as representative alloy systems, demonstrating a good agreement between theory and experiments within the temperature range in which the dislocation motion is overdamped. Through a parametric study, two guideline maps of the misfit parameters against (i) the critical resolved shear stress, tau(0), at 0 K and (ii) the energy barrier, Delta E-b, against dislocation motion in a solid solution with randomly distributed solute atoms are created. With these two guideline maps, tau(0) at finite temperatures is predicted for other Al binary systems, and compared with available experiments, achieving good agreement. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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