Abstract
The isothermal oxidation behavior of TiAl based alloys at 900 °C in air with a combination of Nb (5%-10%, mole fraction) and Si (1%-5%, mole fraction) was investigated. The microstructure and the composition of the oxidation scale were studied by using XRD, TEM and EPMA. The results show that the combination of Nb and Si can improve the oxidation resistance of the alloys significantly. The element Si can change the typical microstructure of oxidation scale on TiAl based alloys. In alloys with Si addition, the compact Al 2O 3 forms in the interior side of oxidation scale. When x(Si)>3%, the Ti 5Si 3 phase forms and the coarse crystal TiO 2 forms on Ti 5Si 3 phase after oxidation. The increase of Nb content in the TiAl based alloys impedes the growth of Ti 5Si 3 phase, and the formation of TiO 2 on surface and on Ti 5Si 3 phase is also impeded.
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