Abstract
Effects of yttrium addition on the formation of oxide scales and the oxidation resistance of elemental powder metallurgy (EPM) processed TiAl-Mn-Mo-C alloys were studied. The Y-containing TiAl-based alloys (0:1� 0:6 at%Y) showed better oxidation resistance than Y-free alloy oxidized in air at 800 � C for 350 h. The Y-containing alloys showed a significantly reduced weight gain, especially for 0.6 at%Y-added alloy. In the Y-free alloy, the scale formed during extended air-exposure at 800 � C consisted of TiO2 and � -Al2O3. For 0.6 at%Y-added alloy, however, the oxide scale was composed of a complex mixture of TiO2, � -Al2O3 ,Y 2O3 and Al5Y3O12. The formation of multi-phase (Y, Al)O-type oxides layer in a transitional Y-rich subscale close to the substrate and an increase of the amount of � -Al2O3 in the mixture oxide layer in the Y-added alloys were the main contributor to improving the oxidation resistance of the alloys. The reduction of oxygen content in the substrate also had a beneficial effect on the oxidation resistance of the Y-containing TiAl-based alloys.
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