The internal friction spectra in various cold-worked iron-based alloys showed that the intensity ratio of the peaks, corresponding to the relaxation processes at 0.52eV (β peak) and 0.96eV (γ peak), was proportional to the impurity concentration. Such correlated behavior of the two most dominant modes in the spectra was explained by a model which incorporates an increase in the β-relaxation process at the expense of the kink-antikink pair (γ-peak) nucleation process in pinned dislocation segments. Very good agreement between measured and calculated spectra was obtained by varying a single parameter: the ratio between the average size of the kink-antikink pairs and the average impurity-impurity distance.

Interplay of Dislocation-Related Relaxation Processes in Iron-Based Materials. M.J.Konstantinović: Physical Review B, 2008, 78[5], 052104 (4pp)