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Information × Registration Number 0219U102221, 0115U001401 , R & D reports Title Scientific basics development of obtaining and physic-mechanical properties determination of the new class nanostructural superhard nitride coatings based on high-entropy alloys popup.stage_title Head Voyevodin Viktor M., Доктор фізико-математичних наук Registration Date 23-12-2019 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description2  The research report contains 58 pages, 15 figures, 17 tables, 45 references. The research objects are multicomponent high-entropy alloys (VES) and nanostructured multilayer nitride coatings. The aim of the work is to obtain high-entropy cathodes containing lanthanides for vacuum arc spraying. Investigation of physical and mechanical properties, structural state, heat resistance of superhard coatings. Research methods - measurement of hardness, determination of the level of elasticity and yield strength by indentation method, determination of friction coefficients by two methods, heat resistance, structural studies. The performed studies of the structure, physical and mechanical properties and X-ray analysis of high-entropy alloys with the optimal compositions of TiZrNbTaHfY and AlCrTiZrNbY. The possibility of obtaining nanostructured nitrides of these alloys with hardness up to 50 GPa in vacuum up to 1100 ° C is shown. The introduction of yttrium makes it possible to increase the thermal stability of highly entropic superhard nitride nanostructured coatings during annealing in vacuum and at atmospheric pressure. It is shown that metal coatings, like cast alloys, have friction coefficients at the level of 0.6, but nitride coatings of these alloys have sufficiently low friction coefficients at the level of 0.06-0.085. Key words: nanocrystalline coatings, multi-element coatings, multilayer coatings, supersolidity, lanthanides, morphology, structure. Product Description popup.authors Andreev Anatolii O. Voyevodin Viktor M. Dolomanov Andrij V. Kovteba Dmitro V. Ostroverh Oleksij O. Serdiuk Irina V. Stolboviy Vyacheslav O. Chikrigov Oleksandr M. Chernoivanov Evgen V. Shepelev Anatolij popup.nrat_date 2020-04-02 Close