Competition between prismatic and basal slip in hexagonal titanium-aluminum alloys with short-range order

Piotr Kwasniak (1) , Stéphanie Delannoy (2) , Frédéric Prima (2) , Emmanuel Clouet (3)

1 Faculty of Mathematics and Natural Sciences, College of Sciences, University of Cardinal Stefan Wyszynski,
2 IRCP - Institut de Recherche de Chimie Paris
3 SRMP - Service de recherches de métallurgie physique

Plasticity of hexagonal titanium-aluminum alloys depends on the solute concentration and the order state of Al atoms. Development of short-range order (SRO) modifies Al strengthening and impacts the competition between prismatic and basal slip modes. Using ab initio calculations, we study the interaction of a screw dislocation with isolated Al atoms and Al pairs in a hcp Ti existing in short-range ordered Ti-Al alloys. Calculated activation energies reveal pronounced hardening caused by Al addition for both slip systems, which become competitive. This hardening is enhanced for Al pairs, resulting in a reduced plastic anisotropy of Ti-Al alloys with SRO.

Domains: Materials Science [cond-mat.mtrl-sci]

Piotr Kwasniak, Stéphanie Delannoy, Frédéric Prima, Emmanuel Clouet. Competition between prismatic and basal slip in hexagonal titanium-aluminum alloys with short-range order. Materials Research Letters, 2023, 11 (6), pp.407-413. ⟨10.1080/21663831.2023.2169082⟩. ⟨cea-03955931⟩