The possible origins of flow stress anomalies were classified into 2 main categories. Thus, velocity-type anomalies resulted from an anomalous response of individual dislocation velocities to a temperature variation, whereas exhaustion anomalies involved a variation in the mobile dislocation density. It was shown that the former type usually exhibited a normal strain-rate sensitivity, whereas the strain-rate sensitivity of the latter type was expected to be zero, after a normal positive transient.

F.Louchet: Philosophical Magazine A, 1995, 72[4], 905-12