Experimental data were presented for cubic single crystals which were deformed in a <112> direction. These data included the flow stress, and its strain-rate sensitivity, as well as the dislocation densities and the distances between glide obstacles along the dislocations. A model was proposed in order to describe the marked variation in plastic deformation parameters below 1000K. It assumed that the mechanisms which controlled dislocation motion changed from pinning by localized obstacles (small precipitates or jogs), above a transition temperature, to the surmounting of Peierls relief at lower temperatures. The model was in agreement with most of the experimental observations.

B.Baufeld, B.V.Petukhov, M.Bartsch, U.Messerschmidt: Acta Materialia, 1998, 46[9], 3077-85