Basal slip of a screw dislocations in hexagonal titanium

Piotr Kwasniak (1) , Emmanuel Clouet (2)

1 Faculty of Materials Science and Engineering
2 SRMP - Service de recherches de métallurgie physique

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 dissocia-tion 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.

Mots clés: Basal slip; Titanium; Plasticity; Dislocations; Ab initio

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Piotr Kwasniak, Emmanuel Clouet. Basal slip of a screw dislocations in hexagonal titanium. Scripta Materialia, 2019, 162, pp.296-299. ⟨hal-01966703⟩