Nonlinear theory of the dislocation‐enhanced Snoek effect and its connection with the geometric and/or thermal kink oscillations on nonscrew dislocations in body‐centered‐cubic metals

摘要

The dislocation‐enhanced Snoek effect, which is induced by the forced vibrations of the interacting kinks (geometric and/or thermal) on nonscrew dislocations in the atmosphere of mobile interstitials, is formulated by taking into account the nonlinear character of the atomic hopping motion of interstitials, as well as the existence of the strong and inhomogeneous static interaction field associated with the kinked dislocation lines. The desired explicit and transparent expression for the internal friction behavior of defects is also worked out, which reveals clearly the effect of the site saturation on the relaxation strength as well as on the activation enthalpies, especially for the case of highly localized binding interaction (hydrostatic) between interstitial foreign atoms and the dislocation lines.