Abstract
An alloy of 51.23Ti−48.73Al−0.4Fe (at.%) was oxidized at 800, 900 and 1000°C in air to determine the effect of Fe on oxidation. The scales formed consisted of an outer TiO2 layer, an intermediate Al2O3 layer, and an inner mixed (TiO2 Al2O3) layer, typical of conventional TiAl alloys. A small amount of dissolved Fe ions was weakly segregated in the outer TiO2 layer and also in the inner (TiO2−Al2O3) mixed layer. Ti2AIN and TiN were detected in the scale in some instances. A thin, oxygen-affected Ti3Al sublayer formed at the oxide-substrate interface. The overall oxidation kinetics and the scale morphology were not affected by Fe-addition.
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