Annealing response of the intermetallic alloy Ti-22Al-25Nb

A hot rolled two-phase Ti-22Al-25Nb (at.%) alloy containing the orthorhombic (O) and β(B2) phases was subjected to thermal treatment under different conditions. The experiment was aimed to examine the recrystallization response of the β(B2) phase (static and dynamic) to microstructure and crystallographic texture evolution using scanning electron microscopy coupled with electron backscattered diffraction (SEM-EBSD). Specimens rolled in the two-phase (O + β(B2)) region consisted of highly deformed β(B2) grains. The texture was close to that of the typical bcc deformation texture with a few additional texture components. A subsequent heat treatment of these rolled specimens in single β(B2) phase region was characterized by static recrystallized β(B2) grains with the final texture partly inherited from as-rolled material. In contrast, specimens rolled in the single β(B2) region produced β(B2) grains with the texture similar to that of completely dynamic recrystallized one.