In a lamellar TiAl alloy deformed at room temperature under an orientation that activates slip parallel to the interfaces, the γ phase exhibited intralamellar dislocation networks parallel to the primary slip plane and entirely glissile in their habit plane. Their meshes were mainly rectangular with branches all coplanar, screw or near-screw in character and with Burgers vector of ½<110] and ½<112] types. Dislocation organization at and in the near-vicinity of these intralamellar networks suggested a reaction between a family of primary coplanar <011] dislocations that slip in the network habit plane and a family of ½<110] dislocations that cross-slip from a plane inclined to the lamellae into the network. The reactions resulted in junctions with ½<112] Burgers vector that subsequently transformed into rectangular units. The presence of these networks was consistent with that of a residual elastic twist between adjacent γ lamellae.

Intralamellar Dislocation Networks Formed by Glide in γ-TiAl - Mechanism of Formation. A.Couret, H.A.Calderon, P.Veyssière: Philosophical Magazine, 2003, 83[14], 1699-718