Advanced Materials Research Vol. 1084

Abstract: The results of study of surface morphology and chemical composition of biocompatible titanium oxide and oxynitride coatings deposited by the method of reactive magnetron sputtering are presented in this paper. The distribution of coating’s fragments in size was obtained. Molecular composition of the coatings was obtained by scanning electron microscopy and Raman scattering.

Abstract: The mechanical activation of the base mixture of TiO2-B was researched in terms of the structural changes leading to the formation of a mixture of micro particles whose volume increases with the increase of the power intensity of the mechanical activation of the furnace charge and it also increases the surface contact area of the components of the mixture participating in the synthesis. The limit of the mechanical activation of the researched system is 120g.

Abstract: High-reflectance aluminum films are widely used in applied optics. As part of this work, we deposited aluminum films on glass substrates by magnetron sputtering using argon ion beam assistance. The reflectivity of the films obtained was measured on the SF-256 spectrophotometer. The microstructure and topology of the films were examined with a transmission electron microscope (TEM), X-ray diffraction (XRD) and atomic force microscope (AFM). The studies have shown that the aluminum films deposited with ion assistance have higher reflectance in the UV range than the films formed by magnetron sputtering alone. The results of TEM and AFM measurements show that the geometric factor (crystallite size, surface roughness) is not the reason for the increase of reflectivity. X-ray diffraction analyses have shown a significant increase in microstress in the aluminum films deposited with ion assistance, which is caused by an increase in the defect density of the vacancy-type crystal structure. The results have shown that the increase in the density of crystal defects leads to an increase in reflectance in the UV range.

Abstract: The study demonstrated that implementation of eddy currents of different frequencies enables identification of altered phase composition, diffusion properties and metal hydrogenation extent. Using the newly developed parameters of eddy current method sensitivity, we have established that the change of a metal structure from one layer to another is identified by the currents of different frequency according to the depth of their penetration into a metal.

Abstract: The work considers the application of a magnetic spectrometer (MS) for analyzing the hydrogenation of metals (particularly, titanium and copper). Therefore, for the sake of increasing the sensitivity of the magnetic spectrometer, the following ratios are introduced: (ΔU/U)/(Δd/d) (where ΔU/U is the relative change of the MS signal and Δd/d is the relative change in the thickness of a sample), (ΔU/U)/(Δδ/δ) (where Δδ/δ is the relative change in the depth of eddy current penetration into metal) and (ΔU/U)/(ΔS/S) (where ΔS/S is the relative change in the area of sample). These parameters allow to eliminate or reduce the error in determining the conductivity value. Parameter β that is equal to the product of the sample area and the inverse value of eddy current penetration depth into metal corresponds to the effectiveness of the current penetration into metal. The authors derived a formula that ties the electric conductivity of metal to the number of implanted hydrogen atoms, which allows determining the composition of titanium hydride at different depth of metal.

Abstract: As a result of the work of Frank-Read dislocation source the shear zone is formed. It is filled with deformation defects forming as a consequence of the dynamic features of the motion of dislocation loops and due to the interaction of shear forming dislocations with dislocations of non-coplanar slip systems. The accumulation of jogs on screw segments leads to the fact that the edge segments are moving faster than the screw segments so the shear zone is swept out generally by screw segments. The expressions of the intensities of the deformation defects accumulation in shear zones are given in the article. The point defects plays special role in the formation and evolution of misorientation substructures into deformed monocrystals, polycrystals and nanocrystals.

Abstract: We have researched the influence of the carbon pulse ion beam on samples of technical titanium VT1-0. The beam energy was 200 kV; the pulse duration, 80 ns; the energy density, 1.92 J/cm². It was established that the 1.8 µm deep modified layer with high hardness and low rate of hydrogen sorption in the bulk of material was formed during the exposure to the carbon pulse ion beam.

Abstract: The paper presents the investigation results of an opportunity to create a new type membrane with increased characteristics for the pure hydrogen release from hydrogenous gas mixtures. A multilayer coating formed from alternating layers of Nb–Ti and Ti/TiNi on the substrates was used to create hydrogenselective membranes. The substrates of two types were used: plates of porous metal with submicron pore sizes and nickel plates with submicron columnar structure grown on its surface by means of nickel synthesis via a template.

Abstract: Hydrogen sorption, structural phase state and mechanical properties after hydrogenation of zirconium alloy Zr1%Nb with ZrO₂ and TiO₂ coatings were investigated. It has been established that ZrO₂ coating reduces the rate of hydrogen sorption by zirconium alloy Zr1%Nb in comparison with the initial material at hydrogen saturation temperature 450 °С.