Lattice model for self-interstitial trapping by solutes

The interaction of self-interstitials with solutes is described by a potential which provides a number of different trapping positions around a solute. These positions are characterized by transition rates of the occupying interstitials to jump from one position to another, or even to dissociate from the solute into the free lattice. The mathematical treatment allows time-dependent calculation of trapping and de-trapping rates to be made By fitting the model to experimental data. unresolved questions, such as the origin of the T −2 temperature dependence of capture radii or the unsaturable trap behaviour for average interstitial-per-trap-ratios up to one, are answered in terms of non-stationary conditions in the trapping area.