The geometrical and structural characteristics of interactions between stacking faults and antiphase boundaries in the massive γ-phase of Ti-46.5at%Al alloy, quenched from the high-temperature α-phase, were analysed by using atomic models. The results confirmed the transmission electron microscopic observation that stacking faults which were bounded by 1/6<121> Shockley partial dislocations were superlattice intrinsic stacking faults, and that the antiphase boundaries connected only with 1/6<121> partial dislocations and not with those of 1/6<112]-type. The formation of an intermediate disordered face-centered cubic phase during the α-to-γ transformation was suggested to account for these defect configurations.

Geometrical and Structural Characteristics of Stacking Fault-Antiphase-Boundary Interactions in the Massive γm Phase in a Quenched Ti-46.5at%Al Alloy. P.Wang, M.Kumar, V.K.Vasudevan: Philosophical Magazine A, 2000, 80[1], 185-99