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Structural State of High-Entropy Fe40–xNiCoCrAlx Alloys in High-Temperature Oxidation

  • STRUCTURAL MATERIALS RESEARCH
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Powder Metallurgy and Metal Ceramics Aims and scope

The evolution of phase composition and mechanical properties and the formation of oxide layers on Fe40–xNiCoCrAlx (x = 5 and 10 at.%) alloys in long-term oxidation at 900 and 1000°C were studied. In the initial cast state, depending on the aluminum content and valence electron concentration, the alloys contain only an fcc solid solution (VEC = 8 e/a) or a mixture of fcc and bcc phases (VEC = = 7.75 e/a). Thin continuous oxide scales containing Cr2O3 and NiCr2O4 spinel formed on the surface of both alloys oxidized at 900°C for 50 h. A further increase in the annealing time to 100 h leads to the formation of aluminum oxide Al2O3 in the scale on the Fe30Ni25Co15Cr20Al10 alloy, having high protective properties. An increase in the oxidation temperature to 1000°C results in partial failure of the protective layer on the alloy with 10 at.% Al. Long-term holding at 900°C (100 h) + 1000°C (50 h) does not change the phase composition of the Fe35Ni25Co15Cr20Al5 alloy matrix, being indicative of its high thermal stability. In the two-phase Fe30Ni25Co15Cr20Al10 alloy, the quantitative ratio of solid solutions sharply changes: the amount of the bcc phase increases from 4 to 54 wt.% and its B2-type ordering is observed. The mechanical characteristics of the starting alloys and those after long-term high-temperature annealing were determined by automated indentation. The hardness (HIT) and elastic modulus (E) of the cast Fe35Ni25Co15Cr20Al5 alloy are equal to 2 and 147 GPa, respectively, and decrease to 1.8 and 106 GPa after a series of long-term annealing operations. The Fe30Ni25Co15Cr20Al10 alloy shows the opposite dependence: HIT increases from 2.5 in the initial state to 3.1 GPa after annealing and E decreases from 152 to 134 GPa. This indicates that the Fe30Ni25Co15Cr20Al10 alloy is promising as a high-temperature oxidation-resistant and creep-resistant material.

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Authors and Affiliations

  1. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    M. V. Karpets, O. A. Rokytska, V. F. Gorban, M. O. Krapivka & A. V. Samelyuk

  2. National Technical University ‘Igor Sikorsky Kyiv Polytechnic Institute’, Kyiv, Ukraine

    M. I. Yakubiv

Authors
  1. M. V. Karpets
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  2. O. A. Rokytska
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  3. M. I. Yakubiv
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  4. V. F. Gorban
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  5. M. O. Krapivka
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  6. A. V. Samelyuk
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Correspondence to O. A. Rokytska.

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Translated from Poroshkova Metallurgiya, Vol. 59, Nos. 7–8 (534), pp. 139–151, 2020.

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Karpets, M.V., Rokytska, O.A., Yakubiv, M.I. et al. Structural State of High-Entropy Fe40–xNiCoCrAlx Alloys in High-Temperature Oxidation. Powder Metall Met Ceram 59, 467–476 (2020). https://doi.org/10.1007/s11106-020-00180-3

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  • DOI: https://doi.org/10.1007/s11106-020-00180-3

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