Abstract
A nearly single-phase θ-Al 2O 3 scale has been grown on two FeCrAl alloys, according to a time-temperature-transformation relationship for the formation of external alumina scales. SIMS sputter depth profiles of the 18O 16O distribution consistently indicate that θ-Al 2O 3 scales grow primarily by the outward transport of Al. This mechanism is consistent with the observed scale microstructure and is significantly different from tracer profiles for α-Al 2O 3 scales.
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