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Effect of lamellar microstructure on oxidation kinetics of Fe3Al sintered by hot isostatic pressing |
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| Authors: | J Fedotova G Bonnet J Balmain V Gauthier N Ouabadi A Ilyuschenko |
| Affiliation: | a NC PHEP Belarusian State University, 153 M. Bogdanovich Street, 220050 Minsk, Belarus b LEMMA, Bâtiment Marie Curie, Avenue Michel Crépeau, 17042 La Rochelle Cedex 01, France c Laboratoire de Métallurgie Physique, Université de Poitiers, 86962 Futuroscope Cedex, France d Institute of Powder Metallurgy, 41, Platonova Street, 220005 Minsk, Belarus e Joint Institute of Solid State Physics and Semiconductors, 17, P. Brovki Street, 220072 Minsk, Belarus |
| Abstract: | The present paper focuses on the investigation of the relationship between microstructure of Fe3Al prepared by hot isostatic pressing (HIP) and kinetics of alumina layer formation during oxidation at 900 °C, 1000 °C and 1100 °C. As prepared HIPed Fe3Al sample reveals lamellar microstructure with inhomogeneous Al distribution which originates from the preliminary mechanical activation of Fe-Al mixture. At 900 °C, Fe3Al oxidation is characterized by selective growth of very rough alumina layer containing only transient aluminium oxides. In addition to these transient oxides, α-Al2O3 stable phase is formed at 1000 °C. At the highest temperature (1100 °C), continuous and relatively smooth alumina layer mainly contains fine crystallites of α-Al2O3. The initial lamellar structure and phase inhomogeneity in as-HIPed Fe3Al samples are supposed to be the main factors that determine observed peculiarities after Fe3Al oxidation at 900 °C and 1000 °C. |
| Keywords: | A Intermetallics B SEM B XRD B AFM C Selective oxidation |
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