Abstract
As an important precipitate in Zr-alloy, detailed study on the oxidation behavior of Zr(Fe,Nb)2 in atomic scale will help to develop safer materials for reactors. In this study, Zr(Fe,Nb)2 intermetallic was fabricated and exposed to subcritical water (320 °C, 15.5 MPa). On oxidation frontier, the interplay between element diffusion and structure evolution was analyzed. The oxidation process started with the incorporation of oxygen in local strips, which was perpendicular to the direction of oxygen diffusion. Fe was segregated from the oxygen-rich strips via an uphill diffusion process along {001} lattice plane. The “spinodal decomposition”-like phenomenon was observed and discussed.
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