Cracks as sink of irradiation created point defects

The migration of irradiation produced point defects to a crack under mode I load in hcp Mg is studied in this work. Random diffusion processes and the effect of the long-range elastic field of the crack are considered. A discrete model of the material and a numerical method are used. The crack is considered as an isolated defect and the `fictitiousʹ sink strength of the crack tip (k2fT) and crack surfaces (k2fS) for vacancies (v) and interstitials (i) are defined. The dependence of these `fictitiousʹ sink strengths on the anisotropy diffusivity ratio, (Dc/Da), is studied.