Isothermal oxidation behavior of high-Nb-containing TiAl alloys doped with W, B, Y, and C/Si. (1st April 2023)

• Record Type: Journal Article
• Authors: Sun, Tielong; Guo, Zhichao; Cao, Jun; Liang, Yongfeng; Lin, Junpin
• Is Part Of: Corrosion science. Volume 213(2023)
• Publication Date: 2023-04-01
• Subjects: High-Nb-containing TiAl alloys -- Alloying elements -- High-temperature oxidation -- Oxide peg; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2023.110980
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The isothermal oxidation behavior of high-Nb-containing TiAl alloys doped with W, B, Y, and C (WBYC) /Si (WBYS) was investigated via oxidation tests at 900 °C in ambient air. Both alloys exhibited outstanding high-temperature oxidation resistance, with unit weight gains of < 1 mg/cm 2 after 200 h of oxidation at 900 °C. The inclusion of alloying elements could refine the crystalline particle size and reduce oxygen activity, consequently suppressing TiO2 growth and promoting Al2 O3 formation. Furthermore, the generated oxide pegs improved the adhesive strength between the oxide scale and the substrate and the spalling resistance of the oxide scale. Highlights: The oxidation resistance of Ti45Al8Nb alloys was effectively improved by the addition of W, B, Y, and C/Si. The oxidation-induced mass gain values of both alloys are less than 1 mg/cm 2 after oxidation at 900 °C for 200 h. Compared with C doping, the addition of Si effectively improves the oxidation resistance of TiAl alloy.