Abstract
The influence of ∼0.18 wt.%Y addition on the oxidation behavior of Ni3Al-based single crystal alloy IC6SX at 1000 and 1100 °C was investigated, and the structure of oxidized surface was analyzed by X-ray diffraction. The research on the microstructure and composition of the oxides was conducted by means of a scanning electron microscope with EDAX unit. The results show that the addition of yttrium significantly improves the oxidation resistance of this alloy including reducing the oxidation rate and the spallation of oxide scale. The positive effects are probably due to finer grain size of surface oxide improving the scale plasticity, and thinner depth of oxide scale which allows greater critical strain energy of the scale to reduce the intrinsic growth stress. Meanwhile, a small amount of yttrium enhances the selective oxidation of Al and retards the formation of MoO3 which is detrimental to the oxidation resistance of alloys.
Published Version
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