Irradiation of Structural Materials by Heavy Ions and Theoretical Modelling of Swelling and Radiation-Induced Segregation Phenomena

Modelling of RIS in alloy samples along the projected range of metal ions was performed accounting for the non-uniformity of the PD generation rate. It is shown that RIS induces significant changes in alloy composition not only near the sample surface, but also in a wide region near the maximum in PD generation rate. The sample regions with minimum changes in composition of austenitic and ferritic-martensitic steels are recommended for TEM investigation of microstructural evolution at high damage doses under 7 MeV Ni⁺² and 1.8 MeV Cr⁺³ ion irradiations.Molecular dynamic calculations of self-interstitial atom diffusion coefficients as well as of Fe and Cr atoms self-diffusion coefficients in Fe - (5 - 25) Cr alloys at temperatures from 600 to 1000 K were performed. The interatomic potentials used indicate the possibility of the matrix enrichment in Cr near point defect sinks via an interstitial mechanism in Fe-Cr alloys at Cr contents up to 15%. (author)