Abstract
Stages in the development of a protective α-Al2O3 scale on a Ni-15Cr-6Al (wt.%) alloy have been examined. It is shown that prior to the formation of a continuous α-Al2O3 layer, a transient stage of oxidation occurs that consists of a rapid uptake of oxygen with conversion of a thin surface layer of alloy to predominantly spinel and the subsequent development of a discrete layer of Cr2O3. It is also shown that during the transient period of oxidation metastable phases of aluminum oxide are formed which transform to α-Al2O3 upon incorporation into the external oxide scale.
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