# Basal slip of a screw dislocations in hexagonal titanium

## TL;DR

This study uses ab initio calculations to analyze the slip mechanisms of screw dislocations in hexagonal titanium, revealing that basal slip involves pyramidal dissociation and operates via the Peierls mechanism at high temperatures.

## Contribution

It provides new insights into the atomic-scale mechanisms of basal slip in titanium, showing the instability of basal dissociation and the role of pyramidal slip pathways.

## Key findings

- Basal dissociation is highly unstable in titanium.
- Slip occurs via migration of partial dislocations and stacking faults.
- Both basal and pyramidal slip operate through the Peierls mechanism at high temperatures.

## 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 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.