Oxidation Resistance, Creep Strength and Room-Temperature Fracture Toughness of Mo–28Ti–14Si–6C–6B Alloy

A novel Mo–28Ti–14Si–6C–6B (atom %) alloy was designed for ultrahigh-temperature applications. Arc-melting and appropriate heat-treatment at 1600°C results in the targeted four-phase microstructure comprising Moss, Mo5SiB2 (T2), Ti5Si3 TiC. Previously developed three-phase alloys, Moss–T2–Ti5Si3 Moss–T2–TiC, are outperformed by this as an adequate balance of oxidation resistance, creep strength fracture toughness is attained. The behavior characterized substantial oxide scale formation 1200°C being accompanied a mass loss around -50 mg/cm2 after 100 h cyclic oxidation. found to be composed top TiO2 underlying duplex SiO2/TiO2 scale. Minimum rate order 10–7 s–1 300 MPa its room-temperature (12.8 ± 1.2) MPa(m)1/2.