Serdyuk I. Structure and physical-mechanical properties of the vacuum arc nitride coatings based on high-entropy alloys Ti-V-Zr-Nb-Hf and Ti-V-Zr-Nb-Hf-Ta

Dissertation is devoted to the creation of multi-component coatings based on high-entropy alloys. Nitride coatings based on multi-component alloys Ti-V-Zr-Nb-Hf and Ti-V-Zr-Nb-Hf-Ta are obtained by vacuum-arc method under various deposition conditions. The influence of deposition conditions on their physical and mechanical properties, surface morphology, phase and elemental composition, heat resistance, adhesion and wear resistance of coatings is investigated. The crystalline structure is formed without preferential orientation or the preferred orientation [111] for a small substrate bias potential (-100 V), and the crystalline structure have states: [111] + [110] in the case quintuple alloy and [111] + [311] in the case of a six-element alloy at a higher potential of -200 V. Annealing of nitride coating based on high entropy alloy Ti-V-Zr-Nb-Hf to a temperature of 1373K during 10 hours does not change its phase state, while hardness remains high. Multi-component coatings with low abrasion are characterized by a grain size of crystallites 12-25 nm, the absence or low level of perfection texture [111]. Production tests of tools with coatings based on high entropy alloys showed increased stability of the tool to 5-7 times.