Post-creep strain tests were performed on single crystals, at 380C, after creep at the same temperature. When specimens were crept to a plastic strain of about 0.5% under a stress of about 225MPa for 45h, and were then deformed by 2% at a constant strain rate of 0.0001/s at the same temperature, it was found that the dislocation structures were different to those observed after constant strain-rate deformation of annealed specimens at the same temperature. The dislocations were located mainly on the cube cross-slip plane in the pre-crept specimens, instead of on octahedral planes as in conventional annealed specimens. The dislocations exhibited a decidedly curved morphology, although screw and near-screw segments predominated. Although the dislocations glided on the cube plane, super or double Lomer-Cottrell locks of the edge segments were uncommon.

T.S.Rong, I.P.Jones, R.E.Smallman: Philosophical Magazine Letters, 1996, 73[4], 173-8