Physico-Chemical nanomaterials science
Metal-based nanocrystalline materials condensed from the vapor phase
Kozyrev A., Grechanyuk V., Grechanyuk I., Matsenko A., Kovalchul Yu.
Department of Chemistry, Kyiv National University of Construction and Architecture. Povitroflotsky Ave., 31, Kyiv-03037, Ukraine. 
E-mail: artem.v.kozyrev@gmail.com
Experimental study of methods for obtaining nanocrystalline molybdenum- and copper-based materials  on from two independent crucibles on a stationary and rotating substrate [1] has been done. The interaction of the separating layer with condensed Cu-Mo materials was investigated. The influence of substrate material, surface roughness, temperature of the substrate, evaporation rate of starting materials on the mechanical properties of Cu-Mo condensed materials, partially described in [2, 3], was analyzed. It is determined certain content of molybdenum, exceeding which the strength dramatically decreases due to the formation of pores, and it was shown that an increase in the substrate temperature from 700°C to 900°C makes it possible to prevent this effect.
Due to the determination of mechanical characteristics of condensed composite materials obtained on rotating substrates with different surface roughnesses, it was found that a decrease of the roughness of the substrates leads to an increase in the ultimate tensile strength and elongation. It was found that structural defects in the form of rods formed on micro-droplets ejected from the evaporator are the cause of reduced strength and ductility of condensed composite materials. It was establish that the regularities of formation of the technological layer of Cu-Mo condensate depend on the thickness of the separating layer of calcium fluoride.

1.	Grechanyuk N.I., Grechanyuk V.G. Precipitation-Strengthened and Microlayered Bulk Copper- and Molybdenum-Based Nanocrystalline Materials Produced by High-Speed Electron-Beam Evaporation-Condensation in Vacuum: Structure and Phase Composition // Powder Metallurgy and Metal Ceramics.-2018.-56, N 11-12.-P. 633-646.
2.	Grechanyuk N.I., Grechanyuk V.G., Khomenko E.V., Kovalchuk D. Dispersed and layered volumetric nanocrystalline materials based on copper and molybdenum condensed from the vapor phase // Electrotechnica & Electronica.-2018.-7-8.-P. 212-223.
3.	Orac L., Grechаnyuk V., Metoseriu O., Constantinescu S. Structure-Property Correlation of Composite Materials Based on Cu-Mo Obtained by PVD Method // The Annals of “Dunarea de Jos” University of Galati, Fascicle IX. Metallurgy and Materials Science.-20136.-1.-P. 5-9.