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High Temperature Oxidation of β-NiAl

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Abstract

The oxidation of single crystal β-NiAl has been studied primarily using electron microscopy. Oriented metastable Al2O3 phases form during transient oxidation at 800°C. Specific orientation relationships exist on all metal orientations studied and are a result of the small mismatch along aligned close-packed directions in the cation sublattices of the metal and oxide. Transformation of the metastable Al2O3, phases at 1100°C results in an oxide morphology described as the “lacey” structure of α-Al2O3 scales. This structure results from impingement of oriented patches α-Al2O3 as the transformation initiates and moves radially parallel to the sugfhce. Scale growth occurs by diffusion along high angle grain boundaries. A drastic reduction in oxidation rate accompanies the change in oxide morphology.

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Authors and Affiliations

  1. Dept. of Metallurgy and Matl’s Sci., Case Western Reserve University, Cleveland, OH, 44106, USA

    Joseph K. Doychak & T. E. Mitchell

  2. NASA Lewis Research Center, Cleveland, OH, 44135, USA

    J. L. Smialek

Authors
  1. Joseph K. Doychak
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  2. T. E. Mitchell
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  3. J. L. Smialek
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Doychak, J.K., Mitchell, T.E. & Smialek, J.L. High Temperature Oxidation of β-NiAl. MRS Online Proceedings Library 39, 475–484 (1984). https://doi.org/10.1557/PROC-39-475

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