OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 3 2023 Structure and properties of HEA-based coating reinforced with CrB particles Alexey Ruktuev 1, a,*, Aleksandr Yurgin 1, b, Vladislav Shikalov 2, c, Arina Ukhina 3, d, Ivan Chakin 4, e, Evgeny Domarov 4, f, Gleb Dovzhenko 5, g 1 Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation 2 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, 4/1 Institutskaya str., Novosibirsk, 630090, Russian Federation 3 Institute of solid state chemistry and mechanochemistry SB RAS, 18 Kutateladze str., Novosibirsk, 630090, Russian Federation 4 Budker Institute of nuclear physics SB RAS, 11 Lavrentyeva str., Novosibirsk, 630090, Russian Federation 5 SRF “SKIF”, 1 Nikolsy Prospekt, Koltsovo, 630559, Russian Federation a https://orcid.org/0000-0002-1325-1533, ruktuev@corp.nstu.ru, b https://orcid.org/0000-0003-0473-7627, yurgin2012@yandex.ru, c https://orcid.org/0000-0002-0491-2803, v.shikalov@gmail.com, d https://orcid.org/0000-0003-1878-0538, auhina181@gmail.com, e https://orcid.org/0000-0003-0529-2017, chak_in2003@bk.ru, f https://orcid.org/0000-0003-2422-1513, domarov88@mail.ru, g https://orcid.org/0000-0003-0615-0643, g.d.dovjenko@srf-skif.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2023 vol. 25 no. 3 pp. 87–103 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2023-25.3-87-103 ART I CLE I NFO Article history: Received: 07 April 2023 Revised: 25 April 2023 Accepted: 11 May 2023 Available online: 15 September 2023 Keywords: Electron beam surfacing Chromium boride CoCrFeNiMn High entropy alloy Coating Funding This study was funded by Russian Science Foundation No. 22-79-00189, https://rscf.ru/project/22-79-00189/. Acknowledgements Structural investigations were conducted at core facility “Structure, mechanical and physical properties of materials”, wear resistance test was conducted at core facility “Mechanics”. ABSTRACT Introduction. Currently, a new class of materials, namely high-entropy alloys, is an active area of research. One of the areas of its application is the fabrication of protective coatings with high performance properties. The high-entropy alloy of CoCrFeNiMn composition is characterized by high ductility, which is retained both at elevated and cryogenic temperatures, as well as high thermal stability and, thus, can be considered as promising materials for protective coatings formation. At the same time, its disadvantages are low hardness and strength. It is known that the reinforcement of the CoCrFeNiMn high-entropy alloy with hardening particles is an effective way to improve the mechanical properties of coatings. It is assumed that the addition of hardening boride particles affects positively on the mechanical characteristics of the alloy. The aim of this work is to study the structural and phase states and wear resistance of coatings based on a CoCrFeNiMn high-entropy alloy reinforced with CrB particles. Coatings obtained by the method of non-vacuum electron-beam surfacing of powder mixtures with different mass ratios of CoCrNiMn metal powders to the CrB powder (100:0, 95:5, 90:10, 80:20, 70:30) are studied in this work. To investigate the structure and phase composition of the coatings, such methods as optical microscopy, scanning electron microscopy and X-ray diffraction analysis were applied. To study the elemental composition, energy-dispersive X-ray analysis was used. The mechanical properties were evaluated based on the microhardness measuring results. The wear resistance of the coatings was determined under conditions of dry sliding friction during reciprocating motion. Results and discussion. The addition of CrB powder to the surfacing mixture led to the formation of eutectic structures. When 5 wt. % CrB was added, a hypoeutectic structure is formed in the coating. An increase in the amount of CrB leads to the formation of coatings with a hypereutectic structure containing primary borides. The main phases found in the coatings are the fcc solid solution, and (Cr,Mn,Fe)2B, (Ni,Co,Mn)2B, CrB borides. All the studied coatings are characterized by an adhesive wear mechanism. The addition of 20 % and 30 % CrB to the surfacing mixture composition results in the wear resistance increase of the high-entropy alloy-based coatings by 3.6 and 6.1 times, respectively. For citation: Ruktuev A.A., Yurgin A.B., Shikalov V.S., Ukhina A.V., Chakin I.K., Domarov E.V., Dovzhenko G.D. Structure and properties of HEA-based coating reinforced with CrB particles. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2023, vol. 25, no. 3, pp. 87–103. DOI: 10.17212/1994-6309-2023-25.3-87-103. (In Russian). ______ * Corresponding author Ruktuev Alexey A., Ph.D. (Engineering), Associate Professor Novosibirsk State Technical University, 20 Prospekt K. Marksa, 630073, Novosibirsk, Russian Federation Tel.: +7 (383) 346-06-12, e-mail: ruktuev@corp.nstu.ru
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