The dislocation micro-mechanisms which operated in an Al-rich γ-TiAl single crystal, deformed by ½<110]{111} slip, were investigated with particular attention to the generation and organization of prismatic loops and the reaction of these with mobile dislocations. The loops were frequently arranged as staircase strings, with one loop extremity aligned in the screw direction with the extremity of a nearby loop. Strings and dislocations tended to aggregate into loose walls. Also typical of deformation at room temperature, were elongated loops piled up into multipoles whose extremities were often aligned with the screw direction. The causes of dislocation point-like and hairpin-like pinnings were explained within the context of existing models.

Properties of <110]{111} Slip in Al-Rich γ-TiAl Deformed at Room Temperature - I. Transmission Electron Microscopy Analysis of Deformation Debris. F.Grégori, P.Veyssière: Philosophical Magazine A, 2002, 82[3], 553-66