Abstract
The partial spalling that occurs upon cooling after high temperature oxidation has permitted the direct observation of the alloy-oxide interface, as well as the separated interfaces of the alloy and the oxide. The large depth of focus of the scanning electron microscope has shown a striking difference between the true area of contact and the nominal geometrical interfacial area, both within the alloy grains and at the grain boundaries. The relevance of these observations to the determination of the rate controlling step and the diffusing species in the oxidation process is discussed.
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