Moskalenko V. The role of nonlinear interdependence of point and extensive defects in the modification of strength and plasticity characteristics of materials under irradiation

The role of nonlinear interdependence of point and extensive defects in the modification of creep rate was theoretically investigated. The creep was simulated within framework of the dislocations clime - glide model. It takes into account that glide dislocation can capture point defects and their small clusters. The results of investigation of nonlinear equations system, which describe the creep development, are represented as state diagram and phase portraits. The modification of state diagram and phase portraits depending on conditions of irradiation, characteristics of sample and its initial state were researched. All qualitatively different phase portraits were achieved. Bifurcations and changes of creep rate were determined due to this model. It was founded possible stationary creep states. Within framework of the barrier mechanism of radiation hardening the influence of complexes, which were created with point defects and impurity atoms, was investigated on the value of increment of yield stress.The critical magnitude of parameters was determined, when spatial-periodical distribution of point defects is placed.