Pyramidal II to basal transformation of⟨ c+ a⟩ edge dislocations in Mg-Y alloys

Ahmad, Rasool and Wu, Zhaoxuan and Groh, Sebastien and Curtin, W. A.. (2018) Pyramidal II to basal transformation of⟨ c+ a⟩ edge dislocations in Mg-Y alloys. Scripta Materialia, 155. pp. 114-118.

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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.
Faculties and Departments:03 Faculty of Medicine > Departement Biomedical Engineering > Imaging and Computational Modelling > Center for medical Image Analysis & Navigation (Cattin)
UniBasel Contributors:Groh, Sebastien
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:12 Aug 2020 14:36
Deposited On:12 Aug 2020 14:35

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