Abstract
Y2O3-dispersed NiAl was produced by a powder-metallurgy process. By adding Y as an oxide dispersion (OD), problems with NiYx formation and internal oxidation were avoided. Short-term isothermal and cyclic-oxidation performance at 1200°–1500° C was compared to cast NiAl alloys with and without Zr. Results indicate that the Y2O3 addition was beneficial to scale adhesion and significantly modified the α-Al2O3 scale microstructure, similar to a Zr alloy addition. However, at 1400 and 1500° C, neither the Y2O3 or Zr additions changed the scale-growth rate, eliminated the formation of voids at the metal-scale interface or prevented scale spallation. These similarities in performance suggest that similar mechanisms occur when the reactive element is added as either an OD or an alloy addition.
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Pint, B.A., Hobbs, L.W. The Oxidation Behavior of Y2O3-Dispersed β-NiAl. Oxidation of Metals 61, 273–292 (2004). https://doi.org/10.1023/B:OXID.0000025335.62402.79
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DOI: https://doi.org/10.1023/B:OXID.0000025335.62402.79