Dislocation mobilities were studied, during in situ deformation in a transmission electron microscope, using a wide range of temperatures and electron beam intensities. The dislocation movement was smooth and continuous; thus indicating lattice-friction control. It was found that, in contrast to III-V compounds, there was only a weak difference between the velocities of screw,  and  dislocations. There was a strong enhancement of the dislocation mobility under electron irradiation. The dislocation glide was temperature-dependent, in that the velocity of the moving segments was proportional to their length over the temperature and intensity ranges which were investigated. All of the results suggested that the dislocation behavior under electronic excitation was still controlled by the Peierls mechanism.

A.Faress, C.Levade, G.Vanderschaeve: Philosophical Magazine A, 1993, 68[1], 97-112