Peculiarities of the point radiation defects accumulation in the fine- and ultra-disperse metallic media

Fine-dispersive powders are a samples of solid systems. In which under irradiation the particle surface layers defect structure changes and has mostly an effect on structural transformations. Theoretical calculations and experimental data show, that the increased interstitials atoms concentration near particles surface during irradiation by either electrons or gamma quanta with energy about 1 MeV give rise to intensive pores healing. At the same time as the dense surface layer formation the pores healing leads to the brachiate borders system formation. The borders serve as pathways for accelerated diffusion. Sintering process and a metal recrystallization are stimulating as well. Both processes lead to the ordered super-structure formation which contributes the additional contribution in an improvement of the mechanical properties of a metal. A liner sizes of the ordered net depend on both the powder sizes and the irradiation conditions. The especial interest present a conditions for such superstructure formation (when the particle sizes are becoming so small (∼1 μm), that effect has being resulted on a defect-formation in the whole volume of a powder particle). In the considered case the point radiation defects accumulation kinetics in the metallic particle is analyzed on the ground of the equation system for atomic concentrations both interstitial atoms and vacancies. The numerical solution of this equation system shows, that particles sizes decline leads to considerable micro-pores healing increase and improvement of conditions for net strengthening. In dependence on irradiation conditions (temperature, dose and dose rate) the forming super-structure could have micro- and nano-sizes