High-Entropy Alloy Coatings: State and Prospects

• Published in: Steel in translation Vol. 52; no. 10; pp. 899 - 906
• Main Authors: Gromov, V. E., Konovalov, S. V., Peregudov, O. A., Efimov, M. O., Shlyarova, Yu. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.10.2022; Springer Nature B.V
• Subjects: Alloying elements; Boriding; Chemistry and Materials Science; Coefficient of friction; Corrosion resistance; Electrodeposition; Electroerosion (machining); Electron beams; Electropolishing; High entropy alloys; Laser deposition; Magnetron sputtering; Materials Science; Mechanical polishing; Microhardness; Niobium; Phase composition; Protective coatings; Solid solutions; Solution strengthening; Stainless steels; Substrates; Surface hardening; Surface treatment; Titanium alloys; Titanium base alloys; Tribology; Wear resistance; films; coatings; high-entropy alloys; deposition methods; wear resistance; tribological properties; mechanical properties
• ISSN: 0967-0912; 1935-0988
• DOI: 10.3103/S0967091222100047

We have made a brief review of recent foreign and domestic publications, in which the structures, phase compositions, and properties of films and coatings of five-component high-entropy alloys (HEA) on different substrates and the modification of HEA surfaces by different kinds of treatment have been studied. The main methods of film deposition and coatings such as magnetron sputtering, thermal evaporation, laser deposition, and electrodeposition are discussed in the paper. Special attention is paid to the deposition of coatings on stainless steels and titanium alloys. A positive change in the tribological, strength properties, and corrosion resistance of film coatings is seen in a wide temperature range. Possible reasons for the observed effects are discussed considering the role of solid-solution hardening, the formation of a fine-grained structure, and the formation of oxide layers enriched by one of the HEA components. New methods for deposition of HEA coatings and subsequent treatment have been distinguished. The role of niobium and titanium in an increase in the microhardness, wear resistance, and decrease in the friction coefficient of the coatings is considered exemplified by alloying with these elements. The electrolytic polishing, electroerosive machining, mechanical polishing, and combinations thereof are used among the HEA surface treatment methods. In some works, it is suggested to use the powder boriding technique to increase the surface strength and wear resistance of HEA. The studies have been analyzed with respect to electron-beam treatment—one of the promising and highly effective methods of HEA surface hardening.