Abstract
Fe25Cr4Al alloys containing Pd and Ru additions were oxidized in air at 1090°C. Scanning electron microscopy, dispersive x-ray analyses, and x-ray mapping were used to characterize the morphologies of the scales formed on these alloys. The results showed that Pd tended to segregate at the oxide-alloy interface as discrete and platelike particles during elevated temperature oxidation of the Pd-containing FeCrAl alloys. These Pd particles appeared to improve the adherence of the alumina scale. However, no improvement of the scale adherence of Ru-containing FeCrAl alloys was observed as outward diffusion of Ru cations to the external alumina scale led to the formation of RuO 2 within this scale.
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