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Structure of transient oxides formed on nicrai alloys

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Abstract

The structure of transient scales formed on pure, Y-doped, and Zr-doped NiCrAI alloys was examined by transmission electron microscopy. Oxidation for 0.1 hour in 1100 °C air produced many of the features observed in mature α-Al2O3 scales, but on a much finer degree: randomly oriented 0.1 to 0.2 μm grains, dispersed porosity decreasing in size and amount toward the oxide-metal interface, and indications of strain and deformation. Other layers in the scale contained structures which preceded the random α-Al2O3 layer: γ-Al2O3, α-(Al, Cr)2O3, or Ni(Al, Cr)2O4 oxides which were composed of 0.1 μm subgrains having nearly the same crystallographic orientation. These layers were densely populated with internal precipitates and Moiré patterns. The underlying metal structures showed evidence of plastic flow (dislocations) due to growth stresses in the oxide and recovery of these interface dislocations into low energy networks. The formation of coherent layers of aluminum-depleted phases indicated the selective removal of aluminum, even for these very short times.

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Authors and Affiliations

  1. NASA Lewis Research Center, 44135, Cleveland, OH

    James L. Smialek (Research Metallurgist)

  2. Case Western Reserve University, Cleveland, OH

    Ronald Gibala (Professor of Metallurgy)

Authors
  1. James L. Smialek
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  2. Ronald Gibala
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Smialek, J.L., Gibala, R. Structure of transient oxides formed on nicrai alloys. Metall Trans A 14, 2143–2161 (1983). https://doi.org/10.1007/BF02662381

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