The importance of the effects of mutual interactions between the interstitial solute atoms in the Cottrell atmosphere on the Snoek-Köster relaxation in cold-worked bcc metals is emphasized in a theoretical approach based on the coupling model. It is shown that the large activation enthalpy of the relaxation time and the breadth of the internal-friction peak associated with the Snoek-Köster relaxation can be explained quantitatively by this model for various foreign atoms in several bcc metals.

• Received 4 April 1994

DOI:https://doi.org/10.1103/PhysRevB.50.3525