Basal slip of ⟨a⟩ screw dislocations in hexagonal titanium. (15th March 2019)

• Record Type: Journal Article
• Authors: Kwasniak, Piotr; Clouet, Emmanuel
• Is Part Of: Scripta materialia. Number 162(2019)
• Page Start: 296
• Page End: 299
• Publication Date: 2019-03-15
• Subjects: Titanium -- Plasticity -- Dislocations -- Ab initio -- Basal slip; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.11.027
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Basal slip of ⟨ a ⟩ screw dislocations in hexagonal closed-packed titanium is investigated with ab initio calculations. We show that a basal dissociation is highly unstable and reconfigures to other structures dissociated in a first order pyramidal plane. The obtained mechanism for basal slip corresponds to the migration of the partial dislocations and of the associated stacking fault ribbon in a direction perpendicular to the dissociation plane. Presented results indicate that both basal and pyramidal slip will operate through the Peierls mechanism of double-kink nucleation and will be equally active at high enough temperature. Graphical Abstract: