Abstract
The oxidation behavior of a cast nickel aluminide alloy, IC221M, was examined after long-term aging in air for up to 16,600 hours at 900 °C and 5000 hours at 1100 °C. The oxidation products were identified using X-ray diffraction and energy-dispersive X-ray (EDX) spectroscopy with multivariate statistical analysis. At 900 °C, NiO dominates the oxidation products initially, but at longer times, NiAl2O4 spinel and Al2O3 predominate and remain stable for times up to 16,600 hours. Cross-sectional observation confirmed that a continuous surface oxide that is mostly a mixture of Al2O3 and NiAl2O4 protects the base metal. In its initial stages, the oxidation process at 1100 °C is qualitatively similar to that at 900 °C but with faster kinetics. However, as aging proceeds, NiO spalls freely from the surface, and a protective continuous oxide scale does not form. The oxidation mechanism can be qualitatively understood by the selective oxidation mechanism maps developed by Giggins and Pettit.
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An erratum to this article is available at http://dx.doi.org/10.1007/s11661-006-0022-1.
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Lee, D., Santella, M.L., Anderson, I.M. et al. Long-term oxidation of an as-cast Ni3Al alloy at 900 °C and 1100 °C. Metall Mater Trans A 36, 1855–1869 (2005). https://doi.org/10.1007/s11661-005-0049-8
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DOI: https://doi.org/10.1007/s11661-005-0049-8