The internal friction coefficients associated with the spread-out host interstitials as well as the decorator point defects were simulated using the discrete kink-chain model of dislocation damping.
A decrease of the damping factor associated with the spread-out host interstitials as well as a peak shift toward lower temperature when the decorator atoms have higher activation enthalpies and/or greater relative sticking powers
Internal friction peak associated with the decorators can be observable as long as the activation enthalpy or the sticking power becomes much larger than the host interstitials
For small activation enthalpy or sticking power differences, the parent damping peak due to host interstitials splits into two sub-peaks: the main peak and the subsidiary peak. The subsidiary peak that occurs on the high temperature shoulder of the initial parent peak disappears eventually, but the main peak stays very stable
The decoration peak is very sensitive function of the kink density as far as the peak maximum position and the peak height are concerned.