Feasibility of using Y2Ti2O7 nanoparticles to fabricate high strength oxide dispersion strengthened Fe-Cr-Al steels

In order to improve the mechanical properties of Fe-Cr-Al ODS steels, Y2Ti2O7 nanoparticles (NPs) were added instead of the conventional Y2O3 NPs. These NPs crystallized with a fine size and shared a semi-coherent interface with the matrix after hot isostatic pressing of the ODS steel. The remarkably improved mechanical properties of the Al-containing ODS steels can be attributed to increasing number density of Y2Ti2O7 nanoprecipitates.421