High-temperature oxidation behaviour of Zr alloyed Fe3Al-type iron aluminide
Source abstract
Abstract
Abstract The oxidation behaviour of two Fe 3 Al-based Fe–Al–Cr–Zr–C alloys has been evaluated between 900 and 1200 °C. The alloys contained either (Fe,Al) 2 Zr Laves phase or ZrC carbide. The alloys were oxidised for up to 1000 h in synthetic air using thermogravimetric analysis (TGA). Scales that formed on the surfaces of the sample as well as cross sections were analysed by light optical microscopy (LOM), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectrometry (EDS). At 900 °C parabolic growth and low weight gains for both tested alloys were observed. The scales are predominantly formed by Al 2 O 3 with minor amounts of ZrO 2 . Some Fe 2 O 3 was observed after oxidation at 900 °C. At 1000 °C oxidation ingresses into the samples along grain boundaries due to preferential oxidation of the Zr-rich precipitates, becoming more severe at higher temperatures. Ingress of oxidation into the sample is more pronounced for the alloy containing ZrC where at 1200 °C it is not any longer limited to the carbide but extends markedly into the Fe 3 Al matrix.
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Research context
OpenAlex topics: Intermetallics and Advanced Alloy Properties · High-Temperature Coating Behaviors · Advanced ceramic materials synthesis
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