The effect of solute cloud formation on the second order pyramidal to basal transition of 〈c+a〉 edge dislocations in Mg-Y solid solutions. (June 2020)

• Record Type: Journal Article
• Authors: Utt, Daniel; Stukowski, Alexander; Ghazisaeidi, Maryam
• Is Part Of: Scripta materialia. Number 182(2020)
• Page Start: 53
• Page End: 56
• Publication Date: 2020-06
• Subjects: Mg-Y alloys -- 〈c+a〉 slip -- Segregation -- Monte Carlo -- Molecular dynamics; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.02.033
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Abstract: We study the effect of solute segregation on pyramidal to basal transformation of 〈 c + a 〉 edge dislocations in a model Mg-Y alloy, using a hybrid Monte Carlo/Molecular Dynamics method. While a random solute distribution has no appreciable effect on this undesirable transition, a solute cloud around the dislocation slows and effectively prevents it in case of Mg-3 at % Y alloy. Comparing with the time scale required for diffusion of Y to the dislocation, suggests that segregation of Y and other fast diffusing elements can be engineered to prohibit this glissile to sessile transition, and stabilize the pyramidal glide of 〈 c + a 〉 dislocations.