Funct. Mater. 2023; 30 (4): 597-605.
Simulation of the influence of alloying elements on the characteristics of the formation of vacuum-arc nitride coatings
1National Technical University "Kharkiv Polytechnic Institute", Kharkiv, Ukraine
2Karlstad University, Karlstad, Sweden
An analysis of trends in the interaction of elements of the Periodic Table was carried out and the results obtained were compared with a model material (namely with a TiN coating); predictions were made for structure formation in vacuum-arc nitride coatings and modeling of the properties of the final coating depending on the composition and deposition conditions This made it possible to explain changes in structural characteristics and mechanical properties in the presence of weaker and/or stronger nitride-forming elements in nitride coatings. Under all deposition conditions and different elemental compositions, single-phase crystalline coatings were obtained. The addition of Mo to the coating increases the lattice period of TiMoN. It was established that the high-entropy coatings (TiVZrNbHf)N and (TiVZrNbHfTa)N are single-phase with an fcc lattice. The high entropy of the system prevents the formation of intermetallic compounds. The coatings are polycrystalline with a crystallite size of 20-23 nm. It has been established that high-entropy coatings obtained at a nitrogen atmosphere pressure of 0.26 Pa and a constant bias potential of –200 V have the highest hardness value of 53–55 GPa. The theoretical model used to analyze the characteristics of high-entropy alloys and nitride coatings based on them has been confirmed experimentally.
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