Measurements of the instantaneous dislocation velocity were considered. These revealed an upper bound on the dislocation velocity which was independent of the temperature. The results also showed that more than one dislocation velocity was measurable during ordinary tensile tests and, as the temperature decreased, only the upper dislocation velocity was observed. These features were explained in terms of dislocations which surmounted barriers inertially.

Dislocation Velocities at Low Temperatures. C.S.Kim, J.M.Galligan: Acta Materialia, 1996, 44[2], 775-9