The creep properties of an as-cast Ti48Al48Cr2Nb2 alloy were studied at 750C and 150MPa. The activation parameters were measured by stress jumps during the creep test. TEM analyses were performed to determine the rate-controlling deformation mechanism. Creep was controlled by the mixed climb of ordinary dislocations, which combines climb and glide components. It was shown that that the stress dependence of the creep rate was correlated to this mechanism.

Correlation between Creep Activation Parameters and Microscopic Dislocation Behaviour in γ TiAl Alloys. J.Malaplate, D.Caillard, A.Couret: Materials Science and Engineering A, 2005, 400-401, 105-8