Scanning Auger electron spectroscopy study of the oxide film formed on dendritic and interdendritic regions of C containing Fe3Al intermetallic |
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| Authors: | V Shankar Rao M Norell V S Raja |
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| Affiliation: | a Corrosion Science and Engineering, Indian Institute of Technology, Bombay, Powai, Mumbai 400 076, India;b Department of Materials Science and Engineering, Chalmers University of Technology, SE-412 96, Göteborg, Sweden |
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| Abstract: | The oxide films formed during early stage of oxidation at 800 °C on dendritic and interdendritic regions of the cast Fe–16Al–1C (wt.%) alloy were studied using scanning Auger electron spectroscopy. Microhardness measurement and elemental depth profiles by Auger spectroscopy reveal that the carbide, Fe3AlC0.69, is the major constituent of the interdendritic region, while dendrites are predominantly Fe3Al phase. Between the two, the interdendritic region is found to be more prone to oxidation than the dendritic region, which was attributed to presence of carbides with low-Al content. In spite of the difference in oxide film thickness exhibited by both the phases, they consist of an inner aluminium oxide layer and an outer iron oxide layer. |
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| Keywords: | Intermetallics-iron aluminide AES XRD Interfaces Oxidation |
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