Heat Treatment Induced Structural Transformations and High-Temperature Oxidation Behavior of Al21Co22Cr22Fe13Ni22 High-Entropy Coatings Produced by Non-Vacuum Electron Beam Cladding Full article
Journal |
Metals
, E-ISSN: 2075-4701 |
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Output data | Year: 2023, Volume: 13, Number: 10, Article number : 1689, Pages count : 17 DOI: 10.3390/met13101689 | ||||||
Tags | HEA; coating; electron beam cladding; annealing; structure; SEM; SXRD; EDX; microhardness; oxidation | ||||||
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Abstract:
In this study, Al21Co22Cr22Fe13Ni22 high-entropy coatings were produced on steel substrates by non-vacuum electron beam cladding of Co, Cr, and NiAl powders. The high-temperature oxidation behavior of the coatings was studied by holding the specimens at 900 °C in air. The microstructure and phase constitution of the samples were studied both in the as-cladded state and after the heat treatment. The microstructure was characterized using light microscopy (LM) and scanning electron microscopy (SEM). Synchrotron X-ray diffraction (SXRD) and energy-dispersive X-ray spectroscopy (EDX) were used to study the phase constitution of the coatings and the “coating-substrate” interface. The coating consisted of disordered bcc (A2), ordered bcc (B2), and disordered fcc (A1) phases. Annealing the coatings for 50 h at 900 °C led to the formation of fcc precipitates in the bcc dendritic grains and a mixture of fcc and σ-phase particles in the interdendritic regions. Needle-like nanosized B2-precipitates were formed due to annealing in the fcc grains at the coating/substrate interface. The microhardness at the top of the as-cladded coating was 585 HV and gradually decreased towards the substrate. A more uniform distribution of the microhardness was obtained after the annealing. Its average value was 441 HV. Rhomboid Cr2O3, needle-like Al2O3, and spinels of a different morphology were found on the surface of the samples after oxidation at 900 °C.
Cite:
Ogneva T.
, Emurlaev K.
, Malyutina Y.
, Domarov E.
, Chakin I.
, Ruktuev A.
, Ryabinkina P.
, Yurgin A.
, Bataev I.
Heat Treatment Induced Structural Transformations and High-Temperature Oxidation Behavior of Al21Co22Cr22Fe13Ni22 High-Entropy Coatings Produced by Non-Vacuum Electron Beam Cladding
Metals. 2023. V.13. N10. 1689 :1-17. DOI: 10.3390/met13101689 WOS Scopus РИНЦ AN OpenAlex
Heat Treatment Induced Structural Transformations and High-Temperature Oxidation Behavior of Al21Co22Cr22Fe13Ni22 High-Entropy Coatings Produced by Non-Vacuum Electron Beam Cladding
Metals. 2023. V.13. N10. 1689 :1-17. DOI: 10.3390/met13101689 WOS Scopus РИНЦ AN OpenAlex
Dates:
Submitted: | Aug 30, 2023 |
Accepted: | Sep 29, 2023 |
Published print: | Oct 3, 2023 |
Published online: | Oct 3, 2023 |
Identifiers:
Web of science: | WOS:001097952000001 |
Scopus: | 2-s2.0-85175017597 |
Elibrary: | 59877874 |
Chemical Abstracts: | 2023:2324669 |
OpenAlex: | W4387343238 |