Simultaneous triple-ion beam irradiation experiments with Fe5+, He+ and H+ ions were performed to simulate fusion damage on two nanostructured ferritic alloys with nominal composition Fe-14Cr-0.3Y(2)O(3) and Fe-14Cr-2W-0.3Ti-0.3Y(2)O(3). Samples were irradiated at 600 degrees C to an estimated dose of similar to 30 dpa, 60 0 appm He, 150 0 appm H, and the effects on the microstructure of these alloys investigated by analytical transmission electron microscopy. The results reveal the development of nanovoids, or small bubbles, undetected in the unirradiated samples, and a virtual compositional stability of the dispersion. Nevertheless, upon irradiation the measured size distribution indicates a slight growth of those dispersoids having the smaller sizes.
Oxide dispersion strengthened steels; Transmission electron microscopy; Nanoparticles; Bubbles