Bashtova A. Modeling spatial organization of point defects in irradiated systems

The conditions for the passage of the processes of the formation of point defects as a result of the action of irradiation and the appearance of deformation instabilities are established when stochastic defect generation is taken into account. Dynamic regimes of growth of vacancy-type clusters and dislocation loops in pure metals are revealed on the example of nickel. In the framework of developed approaches, it is shown that the characteristic size of the vacancy clusters is several nanometers, depending on the rate of damage and the temperature of irradiation. The conditions and properties of the passage of the selection processes of structures upon irradiation of thin metallic films are revealed. It is established that the stochastic process of defect generation does not lead to a disruption of the self-similar void growth regime, increasing only the void size. It is found that when the intensity of dislocations increases, a crossover of dynamic regimes of void size growth takes place with a decrease in the dynamic index from 1/2 to 1/3. The processes of nonequilibrium vacancies rearrangement during spinodal decomposition of the irradiated binary solid solution are studied in details. It was revealed that with increasing the rates of defect formation processes of spinodal decomposition are replaced by processes formation of spatial vacancy structures. It was established that the formation clusters of vacancies is accompanied by the selection of structures. The processes of phase decomposition by a dislocation-sustained mechanism in irradiated binary systems with ballistic the flow of mixing atoms are studied. It is shown that the dislocation mechanism slows down the process ordering. It is established that the spatial correlations of the ballistic flow noise stimulate segregation of dislocation nuclei in the vicinity of interphase boundaries.