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This study is concerned with air oxidation of TiAlCr-Y coated Ti45Al-8Nb (at%) alloy between 750 °C–950 °C for 500 hours. It was shown in these tests that at 750 °C, 850 °C and 950 °C, the oxidation degradation increased with temperature: at 750 °C the oxide scale consisted of TiO2/Al2O3/Cr2O3 phases, whilst at 850 °C the oxide scale consisted of TiO2/Al2O3 phases with a small amount of Cr2O3, and larger number of voids. The material exposed at 950 °C showed a significant formation of TiO2 with a small amount of Al2O3 and high number of voids; the formation of Cr2O3 at 950 °C was inhibited mainly due to the formation of volatile CrO3 or CrO2(OH)2 phase.

High temperature air oxidation resistance of TiAlCr-Y coated Ti45Al8Nb between 750 °C – 950 °C