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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)114-118
Journal / PublicationScripta Materialia
Volume155
Online published23 Jun 2018
Publication statusPublished - Oct 2018
Externally publishedYes

Abstract

Transitions of pyramidal ⟨c + ⟩  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 + ⟩  dislocation stabilization upon addition of RE solutes. Here, ⟨c + ⟩  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 + ⟩  activity and improved ductility in Mg-3 wt%RE alloys are thus not likely associated with solute-stabilization of pyramidal ⟨c + ⟩  dislocations.

Research Area(s)

  • MEAM potentials, Mg-Y alloy, Molecular dynamics simulations, ⟨c + a⟩ dislocations

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