Samples of Ti-26Al-21at%Nb, with the orthorhombic O structure, were deformed at various temperatures and were analyzed in order to determine the sensitivity of their microstructures to the deformation temperature. The activation of [100] and ½<110] dislocations, and interactions between them, were monitored between room temperature and 800C. The activation of dislocations with a [001] component Burgers vector was also identified at high temperatures. A poor ductility in tension at room temperature was attributed to the lack of a sufficient number of slip systems to accommodate the deformation. Attention was paid to the splitting modes and to the energies of the various planar defects which were involved in the dissociations.

F.Popille, J.Douin: Philosophical Magazine A, 1996, 73[5], 1401-18