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The formation of α-Al2O3 scales at 1500°C

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Abstract

The growth of Al2O3 scales on β-NiAl was studied at 1500°C. Oxidation rates, diffusion mechanisms, and microstructures were examined in order to achieve a complete understanding of the scale development. Variation of the Al content within the β phase field had little effect on the oxidation behavior. Ionimplanted yttrium (2×1016/cm2) was observed to provide a short-term improvement in scale adhesion but little long-term effect. When doped with Y or Zr, the first 1 μm of α-Al2O3 was observed to grow mainly by an inward oxygen growth mechanism. At longer times when the implant was ineffective, microstructural observations indicate a mixed-growth mode.

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  1. B. A. Pint

    Present address: Oak Ridge National Laboratory, P.O. Box 2008, 37831-6156, Oak Ridge, Tennessee

Authors and Affiliations

  1. H. H. Uhlig.Corrosion Laboratory, Massachusetts Institute of Technology, 02139, Massachusetts, Cambridge

    B. A. Pint & L. W. Hobbs

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Pint, B.A., Hobbs, L.W. The formation of α-Al2O3 scales at 1500°C. Oxid Met 41, 203–233 (1994). https://doi.org/10.1007/BF01080781

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