The Effect of Implanted Al and/or Y on the Scale Formation on Low-Al Fe20Cr2Al Alloy |
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| Authors: | Jerzy Jedlinski Jean Luc Grosseau Poussard Jarosław Dabek Kazimierz Kowalski Marek Nocun Grzegorz Smola Zbigniew Żurek |
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| Affiliation: | 1.Department of Physical Chemistry and Modeling of Processes, Faculty of Materials Science and Ceramics,AGH University of Science and Technology,Kraków,Poland;2.LaSIE,Université de La Rochelle,La Rochelle Cedex 01,France;3.Department of Surface Engineering and Materials Analysis, Faculty of Metals Engineering and Industrial Computer Science,AGH University of Science and Technology,Kraków,Poland;4.Department of Glass Technology and Amorphous Coatings, Faculty of Materials Science and Ceramics,AGH University of Science and Technology,Kraków,Poland;5.Institute of Inorganic Chemistry and Technology,Cracow University of Technology,Kraków,Poland |
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| Abstract: | The very early stages of the oxidation of an Fe20Cr2Al alloy, unmodified and ion-implanted by aluminium, yttrium and a combination of both elements, Al and Y, were studied at 1100 °C in oxygen using two-stage-oxidation exposures with 18O2 as a tracer and subsequent characterisation of the scales using SIMS analyses of distribution of oxygen isotopes and oxide-related negative ion clusters, SEM observations of the surface morphology and photoluminescence spectroscopy analysis of the phase composition. The scales formed in all cases, except for the Al-implanted alloy, exhibited layered structures, with the outer part comprising Fe- and Cr-rich oxide, and the inner part being Al2O3, which grew due to a mixed outward–inward mechanism . The alumina sub-layers contained the transient oxides and α-Al2O3. Implanted Al significantly affected the mechanism of the scale growth, providing that the scale consisted essentially of α-Al2O3, and grew via a mixed inward-outward mechanism typical for scales on alumina formers. |
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