Abstract
Oxide dispersion-strengthened (ODS) steel is one of the most prominent candidates as the fuel cladding or blanket component in advanced nuclear reactors. The stability and evolution of high-density nanoscale particles in ODS steels during irradiation are of considerable importance in influencing the mechanical properties and irradiation resistance. The microstructure, especially high-density nanoparticles in 12Cr-ODS steel, was investigated in the present study after 1.6 MeV Fe13+ ions irradiation at 450 °C. Atomic probe tomography (APT) and transmission electron microscopy (TEM) were used to track the evolution of microstructure at an atomic scale. Results demonstrate the uniform dispersion of numerous Y-Ti-O nanoclusters in the matrix. The average diameter and Y:Ti ratio of the clusters increased after irradiation. The interface-favorable precipitation of irradiation-induced nanosized α′ phase was especially demonstrated. Radiation-enhanced diffusion (RED) combined with Oswald ripening were considered to illustrate the evolution of Y-Ti-O nanoclusters during irradiation. The segregation behavior of α′ was discussed on the basis of the RED accelerated kinetics and thermodynamic.
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