High-temperature oxidation behaviour of a single-phase (Mo,Ti)5Si3 (Mo–Si–Ti) alloy

The alloy composition Mo–37Si–40Ti (at.%) was synthesized by arc melting in order to obtain nearly single-phase (Mo,Ti)5Si3. At 750–1300 °C, the intermetallic compound was found to be superior to both single-phase Mo5Si3 and single-phase Ti5Si3 with regard to oxidation resistance. Upon oxidation, formation of a protective SiO2–TiO2 duplex scale was observed, which dramatically reduces outward diffusion of Ti. The results indicate that Ti alloying is a promising concept to further improve oxidation resistance of Mo-based alloys such as Mo–Si–B.