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12. Heat Treatment Induced Structural Transformations and High-Temperature Oxidation Behavior of Al 21 Co 22 Cr 22 Fe 13 Ni 22 High-Entropy Coatings Produced by Non-Vacuum Electron Beam Cladding.

Author

Ogneva, Tatiana, Emurlaev, Kemal, Malyutina, Yulia, Domarov, Evgeny, Chakin, Ivan, Ruktuev, Alexey, Riabinkina, Polina, Yurgin, Aleksandr, and Bataev, Ivan

Subjects
HEAT treatment, VACUUM arcs, SURFACE coatings, ELECTRON beams, OXIDATION, SCANNING electron microscopy, MICROSCOPY
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. [ABSTRACT FROM AUTHOR]

Published
2023
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