Atomistic simulation of < c + a > screw dislocation cross-slip in Mg. (May 2016)

• Record Type: Journal Article
• Authors: Buey, D.; Ghazisaeidi, M.
• Is Part Of: Scripta materialia. Volume 117(2016)
• Page Start: 51
• Page End: 54
• Publication Date: 2016-05
• Subjects: Mg alloys -- Nonbasal deformation modes -- Atomistic simulations; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.02.001
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The core structure and glide behavior of a 〈 c + a 〉 screw dislocation in Mg is studied using molecular dynamics simulations at 0 K, 70 K and 300 K. We find that slip on pyramidal II planes is preferred at 300 K. At lower temperatures, the dislocation cross slips between pyramidal II and pyramidal I planes with sufficient applied stress. We find a metastable compact core structure, with an intermediate core energy between those of the dissociated dislocations on pyramidal II and pyramidal I planes. This compact core is observed in the cross slip from pyramidal II to pyramidal I planes at 0 K and 70 K. Graphical abstract: