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The Structure Formation and Hardness of High-Entropy Alloy Coatings Obtained by Electrospark Deposition

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Powder Metallurgy and Metal Ceramics Aims and scope

This paper examines the use of high-entropy alloys (HEAs) as materials for electrospark deposition (ESD). This method is known to produce high-quality protective coatings with a long service life. Arc-melted AlCrFeCoNiCux (x = 0 and 2 mole) cast alloys were used in the research. The HEA coatings were applied to steel 45 employing an Elitron-52A unit. The phase composition, hardness, and microstructure of the cast alloys and associated coatings were compared. The starting HEAs were found to have an inhomogeneous microstructure peculiar to the cast alloys and crystallize to form simple solid solutions with bcc and fcc phases. The AlCrFeCoNi alloy has higher hardness (6229 MPa) than the AlCrFeCoNiCu2 alloy does (5814 GPa). Studies of the structure and phase state of the samples showed that they consisted of an upper layer (coating), transition zone, and substrate with a ferrite–pearlite structure. The hardness, thickness, and continuity of the coatings increase with higher discharge energies Wd in ESD. At Wd = 0.13 J, the coating is 20 μm thick and has 70% continuity; at Wd = 4.6 J, the coating becomes 130 μm thick and is 100% continuous. In contrast to the cast alloys, the high-entropy coatings show higher microhardness: 6230 and 7320 MPa for AlCrFeCoNiCu2 and AlCrFeCoNi, respectively, at a discharge energy of 4.6 J. The coating thickness increases when copper is added to the electrode material. Simple solid solutions peculiar to high-entropy alloys form in both the cast alloys and the coatings. Unlike the cast alloys, the coatings are characterized by homogeneous microstructure.

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Authors and Affiliations

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

    O.M. Myslyvchenko & M. O. Krapivka

  2. Sumy State University, Sumy, Ukraine

    O.P. Gaponova

  3. Sumy National Agrarian University, Sumy, Ukraine

    V.B. Tarelnyk

Authors
  1. O.M. Myslyvchenko
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  2. O.P. Gaponova
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  3. V.B. Tarelnyk
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  4. M. O. Krapivka
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Corresponding author

Correspondence to O.M. Myslyvchenko.

Additional information

Translated from Poroshkova Metallurgiya, Vol. 59, Nos. 3–4 (532), pp. 109–119, 2020.

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Myslyvchenko, O., Gaponova, O., Tarelnyk, V. et al. The Structure Formation and Hardness of High-Entropy Alloy Coatings Obtained by Electrospark Deposition. Powder Metall Met Ceram 59, 201–208 (2020). https://doi.org/10.1007/s11106-020-00152-7

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  • DOI: https://doi.org/10.1007/s11106-020-00152-7

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