Abstract
Isothermal oxidation of NiAl + Zr has been performed over the temperature range of 800–1200°C and studied by TGA, XRD, and SEM. A discontinuous decrease in growth rate of two orders of magnitude was observed at 1000° C due to the formation of α-Al2O3 from θ-Al2O3. This transformation also resulted in a dramatic change in the surface morphology of the scales, as a whisker topography was changed into a weblike network of oxide ridges and radial transformation cracks. It is believed that the ridges are evidence for a shortcircuit outward aluminum diffusion growth mechanism that has been documented in a number of18O tracer studies.
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Rybicki, G.C., Smialek, J.L. Effect of theθ-α-Al2O3 transformation on the oxidation behavior ofβ-NiAl + Zr. Oxid Met 31, 275–304 (1989). https://doi.org/10.1007/BF00846690
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DOI: https://doi.org/10.1007/BF00846690