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The aim of the present study was to investigate the early stages of protective oxide layer growth on Fe-15 at.%Al and Fe-40 at.%Al oxidized at 700 to 900 °C for 5 to 300 min in dry, synthetic air. Emphasis was put on the analysis of the oxide layer with respect to chemical and phase composition using X-ray photoelectron spectroscopy (XPS), grazing incidence XRD with synchrotron radiation and TEM investigations. The results indicate that at all conditions an external oxide layer grows and that this oxide layer consists of an outer, approximately 40 nm thin, Fe 2 O 3 -containing layer followed by a nearly pure Al 2 O 3  layer which grows continuously with increasing temperature and time. The Fe 2 O 3  content of the outer oxide layer decreases with time, temperature and Al content of the binary iron aluminide.

Early Stages of Protective Oxide Layer Growth on Binary Iron Aluminides