The oxidation behavior of binary Fe-Al alloys with an aluminum content between 58 and 64 at.% was studied by isothermal and cyclic oxidation experiments in a temperature range of 900-1000°C. The parabolic rate constants were determined to be comparable to those of B2-ordered Fe-48Al. All investigated alloys exhibited a fine-scaled, lamellar microstructure (\300 nm lamellar spacing), which was a result of the eutectoid decomposition of the high-temperature phase Fe 5 Al 8 into FeAl and FeAl 2 . None of these two phases showed a preferential oxidation. At 900°C h-Al 2 O 3 formed, whereas at 1000°C a transformation of the initially formed h-Al 2 O 3 to the slower growing and passivating a-Al 2 O 3 was confirmed by grazing incidence X-ray diffraction measurements.
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