The present status of high-temperature creep of alloys was reviewed with particular regard to models which were based upon the motion of jogged screw dislocations. Models which were based upon this concept had previously attempted to describe creep in pure metals and alloys. However, in the light of new experimental evidence, a modified version of this model appeared to be appropriate for the case of creep in disordered α-Ti alloys and ordered Ti-Al based intermetallic alloys. Transmission electron microscopic investigations showed that, in both cases, dislocations of screw type dominated the deformation microstructures of these alloys and that jogs which were much taller than atomic dimensions formed along the dislocations.

A Study Based on Jogged-Screw Dislocations for High-Temperature Creep in Ti Alloys. G.B.Viswanathan, R.W.Hayes, M.J.Mills: Materials Science and Engineering A, 2001, 319-321, 706-10