The thermally activated motion of a dislocation through an array of randomly distributed solute atoms was studied. The influence of solute-density fluctuations upon the activation energy for dislocation motion was investigated, and the stress dependences of the effective activation energy and the activation volume were determined. It was shown that, in creep deformation, fluctuations in the activation energies could lead to a creep strain which increased with time according to a power law; with an exponent that increased linearly with increasing temperature.

Dislocation Motion in a Random Solid Solution. M.Zaiser: Philosophical Magazine A, 2002, 82[15], 2869-83