Abstract
The features of the formation the structural state and physic-mechanical characteristics of high-entropy alloys based on refractory metals, both in the cast state and in the state of vacuum-arc coatings, are considered. The studies were carried out using scanning electron microscopy methods with energy dispersive elemental analysis, X-ray diffractometry, and determination of the coefficient of thermal expansion, hardness and adhesive strength. It has been established that the basic state of a high-entropy alloy based on Nb and Zr refractory metals is a single-phase solid solution with a bcc crystal lattice. With the formation of nitrides, the type of crystal lattice changes to fcc. The formation of a nanocrystalline textured state in vacuum-arc coatings is accompanied by a significant increase in mechanical characteristics. The highest hardness of 52.9 GPa and high adhesive strength (181.4 N) were achieved in (TiVZrNbHf)N coatings obtained at PN = 2 • 10−3 Torr.
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