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

• Published in: Corrosion science 2023-11, Vol.224, p.111508, Article 111508
• Main Authors: Cui, Jinghao, Sun, Jianrong, Cheng, Zhaoyi, Xu, Zhibiao, Wang, Tao, Ren, Junqiang, Chang, Hailong, Tai, Pengfei
• Format: Article
• Language: English
• Subjects: Corrosion mechanism; Corrosion resistance; Mechanical properties; Medium-entropy alloys; Nuclear structural materials; Precipitated phase
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2023.111508

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. [Display omitted] •The precipitated phase make the synergy of corrosion resistance and mechanical properties in BCC+Laves structure MEAs.•The selective dissolution of the precipitated phase makes TiO2 segregated at the surface of passive film.•The Ti addition increase the content of V oxides in the passive film to improve the corrosion resistance.•The Ti addition mainly induces precipitation strengthening, grain refinement strengthening to improve mechanical properties.