A model was proposed for describing the influence of impurities adsorbed by dislocation cores on the mobility of dislocation kinks in materials with a high crystalline relief (Peierls barriers). The delay time spectrum of kinks at statistical fluctuations of the impurity density was calculated for a sufficiently high energy of interaction between impurities and dislocations when the migration potential was not reduced to a random Gaussian potential. It was shown that fluctuations in the impurity distribution substantially changed the character of the migration of dislocation kinks due to the slow decrease in the probability of long delay times. The dependences of the position of the boundary of the dynamic phase transition to a sub-linear drift of kinks x ∝ tδ and the characteristics of the anomalous mobility on the physical parameters (stress, impurity concentration, experimental temperature, etc.) were calculated.

Statistical Description of the Motion of Dislocation Kinks in a Random Field of Impurities Adsorbed by a Dislocation. B.V.Petukhov: Journal of Experimental and Theoretical Physics, 2010, 110[1], 41-8