Influence of the deformation conditions on the texture evolution in γ-TiAl

After rolling sheets of TiAl a modified cube component occurs in the texture. The c-axes of the tetragonal unit cells are aligned with the transverse direction. A strong mechanical anisotropy is observed which depends on the temperature. The modified cube texture is stable during tensile deformation and gets sharper even under superplastic conditions. Textures measured after compression up to temperatures of 950°C exhibit a shift of the 〈110〉 and 〈101〉-fibre components. This is caused by mechanical twinning. At higher temperatures (T>1100°C) the highly twinned grains preferently recrystallize and a texture component around 〈302〉 becomes stable. A bulging mechanism is observed as a special form of the dynamic recrystallization.