Effects of precipitated phase on the synergy of corrosion resistance and mechanical properties for FeCrVTix medium-entropy alloys

Abstract

Precipitated phases are generally considered to be beneficial to mechanical strengthening, while harmful to corrosion resistance. However, this study found that the Ti-induced precipitated Laves phase in FeCrVTix medium-entropy alloys (MEAs) improves both corrosion resistance and mechanical properties than FeCrV MEA. Results reveal that the selective dissolution of precipitated phase enhances the corrosion resistance by the segregation of TiO2 and increased V oxide content in the passive film. Only appropriate distribution, size, and content of the precipitated phase induced by specific Ti addition can achieve synergy between corrosion resistance and mechanical properties, suggesting potential reliable materials for nuclear systems.