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Nanocrystalline structure remarkably enhances oxidation resistance of Fe-20Cr-5Al alloy

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  • NSTL
  • Elsevier
The present study investigates the oxidation behavior of nanocrystalline (NC) and microcrystalline (MC) Fe-20Cr-5Al alloys at 900 oC. A protective layer of Al2O3 layer is formed at a relatively lower Al content in the case of microcrystalline Fe-Cr-Al alloys containing sufficient amounts of Cr (i.e. third element effect). The required critical content of Al for the formation of a full-fledged Al2O3 layer can further be reduced by the nanocrystalline structure. We demonstrate here that nanocrystalline Fe-20Cr-5Al alloy becomes capable of developing a protective layer of Al2O3. The results show that nanocrystallization presumably reduces the Al requirement below that is necessary for the “third element effect” of Cr. Consequently, the nanocrystalline Fe-20Cr-5Al alloy oxidized at an insignificant rate (c.f., its microcrystalline counterpart). Accordingly, the NC Fe-20Cr-5Al alloy follows logarithmic oxide growth kinetics, whereas the MC Fe-20Cr-5Al alloy follows parabolic kinetics. Additionally, the MC alloy exhibits four times higher weight gain than the NC alloy after 60 h of oxidation.

DiffusionFe-Cr-Al alloysGrain boundariesNanocrystalline materialsOxidationSintering

Kumar R.、Raja V.S.、Parida S.、Raman R.K.S.、Bakshi S.R.

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Department of Metallurgical and Materials Engineering Punjab Engineering College Chandigarh

Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay

Department of Mechanical and Aerospace Engineering Monash University

Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras

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2022

10.1016/j.jallcom.2021.163568

Journal of Alloys and Compounds

Journal of Alloys and Compounds

EISCI
ISSN：0925-8388
年,卷(期)：2022.900
  • 4
  • 60