Pure climb of [001] dislocations in TiAl at 850 °C

Soumaya Naanani (1, 2) , Jean-Philippe Monchoux (1, 2) , Catherine Mabru (2) , Alain Couret (1)

1 CEMES - Centre d'élaboration de matériaux et d'études structurales
2 ICA - Institut Clément Ader

This paper presents a study by Transmission Electron Miscroscopy of the deformation microstructure in the γ phase of a TiAl alloy crept at 850 °C under 150 MPa. A never observed population of dislocations is evidenced and characterized. It is shown that their Burgers vector is of [001] type and that they are moving by pure climb in the (001) planes. The reasons of the presence of these dislocations are discussed

Mots clés: Dislocation climb; Titanium aluminides; High-temperature deformation; Transmission electron microscopy; Plasticity

Domaines: Mécanique des matériaux [physics.class-ph]

Soumaya Naanani, Jean-Philippe Monchoux, Catherine Mabru, Alain Couret. Pure climb of [001] dislocations in TiAl at 850 °C. Scripta Materialia, 2018, 149, pp.53-57. ⟨10.1016/j.scriptamat.2018.02.002⟩. ⟨hal-01829956⟩