Author:
Doychak Joseph K.,Mitchell T. E.,Smialek J. L.
Abstract
ABSTRACTThe oxidation of single crystal β-NiAl has been studied primarily using electron microscopy. Oriented metastable Al2O3phases 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-Al2O3scales. This structure results from impingement of oriented patchei α a-Al2O3as 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.
Publisher
Springer Science and Business Media LLC
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