TEM analysis of radiation effects in ODS steels induced by swift heavy ions

Rogozhkin Sergey V, Bogachev Aleksei A, Nikitin Alexander A, Vasiliev Alexander L, Presnyakov Michael Yu, Tomut Marilena, Trautmann Christina

Abstract

Oxide dispersion strengthened steels ODS Eurofer and ODS 13.5Cr-0.3Ti were irradiated with 945 MeV Au ions and 167 MeV Xe ions at room temperature. Beam-induced microstructural changes were analyzed by high- resolution transmission electron microscopy in the region of maximum electronic energy loss. In both ODS steels, an increase in the fraction of small oxide inclusions (<5 nm) was observed. In ODS Eurofer steel, the irradiation with Xe and Au ions leads to the formation of amorphous tracks in yttrium oxide inclusions larger than 8 nm, with track diameters of 2 nm for Xe and 3–4 nm for Au ions.