A phase field model for dislocation climb under irradiation: Formalism and applications to pure bcc iron and ferritic alloys

摘要: Abstract A phase-field model allowing to describe dislocation climb under irradiation is presented. Whereas previous models of the literature devoted this phenomenon only take into account vacancies, our approach includes effect self interstitial atoms (SIAs) as required in context irradiated metals. Beyond fact that it rigorously ensures balance between quantity point defects, vacancies and SIAs, absorbed or emitted by loop evolution, present has several originalities. First, capable quantify rate for systems far from equilibrium, which commonly case irradiation. This supplemental methodological developments since we clearly show a mere generalization existing not satisfactory tackle specificity. Secondly, alleviates often adopted assumption perfect sink through introduction kinetic parameter related jog density. preliminary generic study dislocations considered nonperfect sinks leads nonintuitive results, decreases when density increases. Thirdly, possibility consider different types interacting microstructural defects allows significant role defect thermal equilibrium fractions on pure bcc iron conditions. Finally, coupled chemical diffusion equations same formalism. For purpose, multi-time step algorithm proposed order couple phenomena with characteristic time scales orders magnitude, namely climb, diffusion. It interaction motion well-known radiation induced segregation Fe–Cr alloy. shown shape size solute atmosphere can strongly depend