Temperature effects on the mobility of pyramidal < c + a > dislocations in magnesium. (15th January 2017)

• Record Type: Journal Article
• Authors: Fan, Haidong; Wang, Qingyuan; Tian, Xiaobao; El-Awady, Jaafar A.
• Is Part Of: Scripta materialia. Volume 127(2017)
• Page Start: 68
• Page End: 71
• Publication Date: 2017-01-15
• Subjects: Magnesium -- Pyramidal slip -- Molecular dynamics -- Temperature effects -- Dislocation mobility; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.09.002
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Temperature effects on the mobility of < c + a > dislocations on pyramidal planes are characterized by molecular dynamics simulations. On the first-order pyramidal planes, near-edge dislocations always decompose, while the critical resolved shear stress (CRSS) for near-screw dislocations increases with increasing temperatures. On the second-order pyramidal planes, the CRSS decreases to a minimum at ~ 400 K, then increases with temperatures. This indicates that first-order pyramidal slip is favorable at low temperatures, while at elevated temperatures both pyramidal slip planes are active, leading to profuse plasticity. Graphical abstract: