Journal
SCRIPTA MATERIALIA
Volume 155, Issue -, Pages 114-118Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.06.026
Keywords
mg-Y alloy; 'c plus a' dislocations; Molecular dynamics simulations; MEAM potentials
Categories
Funding
- Swiss National Science Foundation entitled Control of Atomistic Mechanisms of Flow in Magnesium Alloys to Achieve High Ductility [162350]
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Transitions of pyramidal 'c + a' dislocations to sessile structures contribute to poor ductility in pure Mg. Mg-3 wt% Rare Earth (RE) alloys have good ductility, possibly due to 'c + a' dislocation stabilization upon addition of RE solutes. Here, 'c + a' stability is investigated in a model Mg-3 at.%Y random solid solution alloy using molecular dynamics simulations. Favorable fluctuations of Y solutes lower all dislocation energies and have no appreciable effects on the transition mechanism, energy barrier, or time. Enhanced 'c + a' activity and improved ductility in Mg-3 wt%RE alloys are thus not likely associated with solute-stabilization of pyramidal 'c + a' dislocations. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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