Advanced Materials Research Vol. 1085

Abstract: The study examines the influence of the modifier based on refractory metal ultrafine oxides on the structure and properties of frogs made of 110Г13Л (Russian grade) high-manganese steel. It is established that the introduction of the modifying mixture leads to the samples grain size refining by 1.5 times, significant reduction in the amount of nonmetallic inclusions in the grain body and along its boundaries, and enhancement of mechanical properties.

Abstract: The design of layers for multilayer flame-resistant glass is a vital task in terms of upgrading fire resistance of window glass units. This paper describes chemical modification of flame-proof acrylate hydrogel layers and shows experimentally how a cross-linking agent — hexamethoxymethylmelamine ether – influences the kinetics of hydrogel polymerization and the enhancement of carbonated structures yield. It has been determined that adding HMMM to the hydrogel composition raises the coke residue yield from 10 % to 35 % and increases the 19 mm thick glass flame resistance class from EI30 to EI50.

Abstract: The effect of high intensity pulsed beam (HIPB) of accelerated carbon ions on zirconia ceramics of the 97ZrO₂-3Y₂O₃ (in mol %) composition is investigated. The parameters of the ion beam are as follows: the energy of the accelerated ions is 200 keV, pulse duration is 100 ns, pulse current density equal to 40 and 150 A/cm². It was revealed that ions treatment of ceramics leads to melting of the subsurface layer. In this area, the grains are elongated towards the surface. Upon treatment of ceramics by accelerated ions with the pulse energy density equal to 3 J/cm² (fluence ≥ 9.4•10¹⁵ cm^–2), formation of zirconia cubic phases up to 30 mass % is observed. The size of coherent-scattering region X-rays of the grains of the c-ZrO2 phase is 15–20 nm. The analysis of the elemental composition of the irradiated surface layers by secondary ion mass spectrometry (SIMS) method makes possible to conclude that formation of high concentration of non-stoichiometric oxygen vacancies under ion treatment is the main cause of the cubic phase stabilization in zirconia.

Abstract: Arrangement of Internal Stresses in Deformed Austenitic Steel is Studied. the Internal Stresses are Determined Using Parameters of Bending Extinction Contours Observing on Electron Microscope Images of the Steel. at the Deformation Degree ε = 14% the Average Internal Stress Values inside Separate Grains with Complex Bending is much Greater than <σ> in a Grain with Simple Bending. the Difference of <σ> at the Deformation Degree ε = 25% in Grains with Simple and Complex Bending is Small. this is Explained by Considerable Relaxation of the Internal Stresses in the Deformed Steel Caused by Appearance at ε > 20% of a Great Number of Microtwin Packages

Abstract: The paper presents the experimental results of saturation of the carbon material containing nanotubes with hydrogen from the gas. The dependences of hydrogen concentration from pressure (from 0 to 8 atmospheres), at the same temperature for adsorption (-30 degrees Celsius) and different temperatures for desorption were obtained. The temperature has an influence on sorption-desorption process and sorption properties of carbon material. The amount of residual hydrogen depends on saturation parameters.

Abstract: Results of surface modification of the VT-23 titanium alloy by high flux of copper ions with an energy of 2 keV and ion current density of 3.5 mA/cm² was studied. The dependence of the microhardness and penetration depth of ion as function of duration of ion treatment was determined. Structural-phase state of ion-modified of the VT-23 titanium samples surface layer was investigated by TEM and SEM. Microhardness was researched by nanoindentation method.

Abstract: The amorphous and nanocomposite coatings on the basis of Si-Al-N with different ratios of Al and Si concentrations were prepared by reactive magnetron sputtering method. Structural-phase state of coatings on the basis of Si-Al-N was investigated by TEM, SEM and X-ray analysis. Microhardness, modulus of elasticity, elastic recovery coefficient was determined by nanoindentation method.

Abstract: The method of translucent diffraction electronic microscopy conducted researches of a microstructure and phase structure of a titanic alloy of VT1-0 implanted by ions of aluminum. There are two types of grains; 1) large grains (LG) with an average size of 1.4 microns and 2) the small grains (FG) with an average size of 0.5 μm. It is established that as a result of radiation the ion-alloyed layer, on the basis of α-Ti grains is formed. The sizes, form and places of localization of secondary phases (Ti₃Al, Al₃Ti and TiO₂) depend on the size of grain of a titanic matrix. The size of dispersive hardening of σ_or for different type of grains on depth of the ion-alloyed layer is calculated. It is shown that in MZ the size σ_or is provided only with TiO₂ particles, in LG – generally TiO₂ particles.

Abstract: The results of the study on properties of shape memory effect alloys, obtained on the basis of the experimentally determined temperature dependency of the shear martensitic stress in the alloy Ti₅₀Ni_48.7Mo_0.3V₁, are described. It has been established that the total strain of the sample and the yield point reach a maximum value (ε = 25.5 %, σ_В = 1280 МPа) at a test temperature of 300 K. It has been methodically shown how using this experiment in NiTi-based alloys it is possible to estimate temperature ranges of shape memory effect occurrence and to determine parameters of mechanical properties.

Abstract: The results of the X-ray phase and thermodynamic analysis of phase formation in the Zr-Y-O system which is the initial material for formation of yttrium of stabilized ceramics on the basis of dioxide of zirconium are presented. It is established that the material is multiphase and contains monoclinic, cubic and tetragonal modifications of dioxide of zirconium which weight ratios differ considerably.