It was noted that, upon rolling γ-TiAl-based alloys, a strong texture occurred which was similar to the cube textures seen in face-centered cubic metals with a low stacking-fault energy. In addition, the tetragonal c-axis was aligned in the transverse direction of the sheet. Compression tests were performed at 700C in the transverse, rolling and normal directions and tensile tests were performed in the rolling and transverse directions. The density of deformation twins, as observed via optical microscopy and transmission electron microscopy, increased with decreasing yield stress and strain hardening. On the basis of these results, the critical resolved shear stresses of the various slip systems in γ-TiAl were modelled using Taylor-type simulations.

Anisotropic Mechanical Behavior of Textured γ-TiAl Caused by the Directionality of Twinning. W.Schillinger, B.Lorenzen, A.Bartels: Materials Science and Engineering A, 2002, 329-331, 644-8