Abstract
In Al-rich γ-TiAl deformed at room temperature, faulted dipoles (FDs) are usually trailed by dislocations with <011] Burgers vector, themselves dissociated into two partials with ⅙<112] and ⅙<154] Burgers vectors. A FD is generated at one of the extremities of the screw locks which <011] dislocations exhibit in places. This occurs via the subdissociation of the ⅙<154] trailing partial. A local configuration atomistically adequate for FD nucleation takes place by continuity of the core structure of the ⅙<154] partial between the lock and the connecting mixed segment. The fact that the FD width does not exceed a certain size is interpreted in terms of the dynamics of FD growth.
