RATE THEORY MODELING OF DEFECT EVOLUTION UNDER CASCADE DAMAGE CONDITIONS - THE INFLUENCE OF VACANCY-TYPE CASCADE REMNANTS ON DEFECT EVOLUTION

Recent computational and experimental studies have confirmed that high energy cascades produce clustered defects of both vacancy- and inters titial-types as well as isolated point defects. However, the productio n probability, configuration, stability and other characteristics of t he cascade clusters are not well understood in spite of the fact that clustered defect production would substantially affect the irradiation -induced microstructures and the consequent property changes in a cert ain range of temperatures and displacement rates. In this work, a mode l of point defect and cluster evolution in irradiated materials under cascade damage conditions was developed by combining conventional reac tion rate theory and results from the latest molecular dynamics simula tion studies. This paper provides a description of the model and a mod el-based fundamental investigation of the influence of configuration, production efficiency and the initial size distribution of cascade-pro duced vacancy clusters.