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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 8    No. 1    March 1998

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INTERNAL OXIDATION OF Fe3Al DURING HIGH TEMPERATURE OXIDATION
Wang Yonggang1, 2  He Yedong1 and Zhu Rizhang1

1.Department of Surface Science and Corrosion Engineering, University of Science and Technology Beijing, Beijing100083, P. R. China;
2.Department of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, P. R. China

Abstract:The oxidation behavior of Fe3Al at 1 000℃in air was studied by thermobalance, scanning electron microscope (SEM) and X-ray diffraction (XRD). It was found that the oxidation kinetics approximately follows the parabolic law; the oxide scale consists of Al2O3 and a little amount of Fe2O3; and there occurs transgranular internal oxidation. Based on the analyses of the oxide scale and the matrix, an internal oxidation model was proposed, which considers the effect of the long-range ordered structure of Fe3Al on its hightemperature oxidation. The long-range ordered structure reduces the activity of Al in Fe3Al, thus reducing the diffusion coefficient of Al in the matrix. Consequently, in the oxidation process, the matrix surface will be seriously depleted in Al and then there occurs internal oxidation.

 

Key words: Fe3Al oxidation internal oxidation corrosion

ISSN 1672-7029
CN 43-1423/U

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