Materials physics and mechanics

RAR RUS 1-17 Institute for Problems in Mechanical Engineering RAS Frolova K.P.

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Bessonov

St.Petersburg, Russia

Institute for Problems in Mechanical Engineering of the Russian Academy of Sciences Vilchevskaya

St.Petersburg, Russia

Determination of the contribution of an imperfectly bonded inhomogeneity to macroscopic diffusivity The paper contributes to the development of micromechanical approaches for determining the effective diffusivity of micro-heterogeneous materials, taking into account segregation, which is the accumulation of impurities at the phase interface. Two analytical approaches are investigated and compared with numerical simulation. In the first analytical approach, segregation is expressed in terms of a segregation parameter that prescribes the jump in concentration at the phase interface. In the second approach, an inhomogeneity with an ultra-thin mass isolating coating is introduced, and segregation is expressed in terms of equivalent surface resistivity. The developed numerical method considers inhomogeneities with an outer weakly permeable shell of thickness that tends to zero. Comparison among various models made it possible to estimate their limitations and perspectives. 10.18149/MPM.5252024_1 effective properties imperfect contacts segregation diffusion homogenization problem https://mpm.spbstu.ru/article/2024.104.1/ 1-Frolova_et-al.pdf

RAR RUS 18-28 Institute for Problems of Mechanical Engineering RAS Belyaev F.S.

St. Petersburg, Russia

St. Petersburg State University Volkov A.E.

St. Petersburg, Russia

Saint Petersburg State University Vukolov

St. Petersburg, Russia

St. Petersburg State University Evard M.E.

St. Petersburg, Russia

St. Petersburg State University Kudrina

St. Petersburg, Russia

St. Petersburg State University Starodubova

St. Petersburg, Russia

Influence of latent heat and heat exchange conditions on tension behavior of shape memory alloy specimen A microstructural model of functional behavior of shape memory alloys has been used for modeling of the pseudo-elasticity effect taking into account the influence of latent heat of the martensitic transformations, heat exchange conditions and strain rate. A completely coupled boundary value problem on tension of a cylindrical rod under conditions of heat exchange with the environment and heat diffusion along the radius has been solved. The obtained results are in good agreement with the available experimental data. The Fourier and Biot criteria were used to evaluate the critical radius, for which it is necessary to solve a fully coupled boundary value problem at given material parameters, deformation rate and heat exchange conditions. It has been shown that the microstructural model taking into account the latent heat release and adsorption is an adequate tool for describing the strain rate dependence of the pseudo-elastic behavior for shape memory alloys. 10.18149/MPM.5252024_2 heat exchange conditions latent heat microstructural modeling shape memory alloys TiNi tension boundary value problem Fourier number Biot number https://mpm.spbstu.ru/article/2024.104.2/ 2-Belyaev-et-al.pdf

RAR RUS 29-39 Ufa University of Science and Technology Medvedev Andrey E.

Ufa, Russia

Ufa University of Science and Technology Kiryanova

Ufa, Russia

Ufa University of Science and Technology Medvedev Evgenii B.

Ufa, Russia

LLC Krus-Zapad Gorbatkov

Ufa, Russia

Ufa University of Science and Technology Zhukova Olga O.

Ufa, Russia

Ufa State Aviation Technical University Murashkin Maxim Yu.

Ufa, Russia

Copper-clad thermally stable Al-Zr wire, produced via copper electrodeposition Producing of the copper-clad aluminium wire made of Al-0.4Zr alloy via electrodeposition was studied. In order to ensure the adhesion of the copper after deposition, the intermediate Ni layer was applied to the aluminium wire surface. Formation of the composite wire with aluminium alloy core and copper sheath resulted in the increase of the ultimate tensile strength from 175 to 233 MPa, while also slightly decreasing electrical conductivity and notably decreasing ductility from 6 to 3 %. Annealing at 300 °C for 1 hour was performed to the composite wire to increase its ductility. Annealing resulted in the recovery of the mechanical properties back to the level of initial aluminium alloy wire, while electrical conductivity increased by 3.5 % IACS, allowing the newly produced composite wire to compete with the commercially produced copper-clad aluminium wires. 10.18149/MPM.5252024_3 aluminium alloys Al-Zr copper-clad aluminium copper-clad aluminium wire electrodeposition mechanical strength electrical conductivity ductility https://mpm.spbstu.ru/article/2024.104.3/ 3-Medvedev-et-al.pdf

RAR RUS 40-47 ITMO University Babkina

St. Petersburg, Russia

ITMO University Kharisova

St. Petersburg, Russia

ITMO University Sheremet

St. Petersburg, Russia

ITMO University Barbash

St. Petersburg, Russia

ITMO University Zhikov K.A.

St. Petersburg, Russia

ITMO University Zyryanova

St. Petersburg, Russia

The heat treatment effect on the spectral and luminescent properties of sodium-germanate glass with CdS The nucleation of CdS quantum dots in a sodium germanate glass matrix by means of isothermal treatment is demonstrated. It is shown that a sufficiently high concentration of cadmium ions in the initial glass results in nucleation of fairly big quantum dots. The luminescence of CdS is mainly of a trap nature and is localized in the region of 600–900 nm. Excess cadmium ions and nucleation of quantum dots in oxide glass lead to the defect nature of the luminescence bands: mainly associated with interstitial cadmium ions (ICd), the donor-acceptor pairs [VCd–VS], and deep trap levels created by volume cadmium vacancies. The luminescence quantum yield of CdS quantum dots is less than 1 %, indicating that nonradiative recombination of charge carriers is the dominant process. 10.18149/MPM.5252024_4 cadmium sulfate germanate glass heat-induced crystallization trap luminescence https://mpm.spbstu.ru/article/2024.104.4/ 4-Babkina-et-al.pdf

RAR RUS 48-54 ITMO University Kaminskii

St.Petersburg, Russia

ITMO University Panov Dmitrii

St.Petersburg, Russia

ITMO University Spiridonov Vladislav

St.Petersburg, Russia

ITMO University Bauman Dmitrii

St.Petersburg, Russia

Ioffe Institute Kalganov

St. Petersburg, Russia

Ioffe Institute Scheglov

Saint Petersburg, Russia

F-1445-2014 7202768874 0000-0003-3738-408X ITMO University Romanov Alexey alexey.romanov@niuitmo.ru

St.Petersburg, Russia

Effect of high-temperature annealing on the internal friction and optical transmittance of single crystal gallium oxide The effect of high-temperature annealing on the structure and properties of single crystal β-phase gallium oxide is reported in this work. The investigated sample obtained by cleaving from a bulk β-Ga2O3 ingot grown by the edge-defined film-fed growth method. Some of the samples were annealed in an oxygen-containing atmosphere at temperatures up to T = 1673 K. The temperature dependences of internal friction and dynamic modulus of elasticity were obtained by the composite oscillator method at a frequency of 100 kHz. Optical absorption spectra were investigated in the wavelength range from 200 nm to 2 µm. It was found that annealing and redistribution of gallium vacancies in beta-phase gallium oxide crystals is accompanied by simultaneous changes in the internal friction in the temperature region around 290 K and in the optical spectrum in the infrared region. 10.18149/MPM.5252024_5 Young’s modulus internal friction optical transmittance vacancies single crystal gallium oxide https://mpm.spbstu.ru/article/2024.104.5/ 5-Kaminskii.pdf

RAR RUS 55-63 Ioffe Institute Butenko

St.Petersburg, Russia

Ioffe Institute Chikiryaka

St.Petersburg, Russia

Ioffe Institute Boiko

St.Petersburg, Russia

0000-0003-4205-3226 Ioffe Institute Guzilova L.I.

St.Petersburg, Russia

Ioffe Institute Krymov

St.Petersburg, Russia

Ioffe Institute Obidov

St. Petersburg, Russia

Ioffe Institute Timashov

St.Petersburg, Russia

Ioffe Institute Shapenkov

St. Petersburg, Russia

Ioffe Institute Sharkov

St.Petersburg, Russia

Ioffe Institute Nikolaev

St.Petersburg, Russia

Spalling-induced β-Ga2O3 lift-off protocol Fabrication of gallium oxide 1–100 µm-thick layers by exfoliation them from single crystals opens up the way to provide good thermal management in high-power Ga2O3 devices. Here we propose a lift-off protocol based on spalling of homoepitaxial layers from (100) β-Ga2O3 bulk crystal. The process includes sputtering of Ni sacrificial mask on β-Ga2O3 substrate and its modification by annealing, prior to epitaxial layer deposition in mist-CVD reactor. The separated 4 μm-thick β-Ga2O3 layers have been studied. It is shown that implementation of the lift-off protocol allows obtaining high-quality free-standing layers. 10.18149/MPM.5252024_6 gallium oxide thick layers single crystals exfoliation lift-off mist-CVD free-standing layers https://mpm.spbstu.ru/article/2024.104.6/ 6-Butenko-et-al.pdf

RAR RUS 64-73 Ioffe Institute Argunova

St. Petersburg, Russia

National Research Centre “Kurchatov Institute” Kohn

Moscow, Russia

National Research Centre “Kurchatov Institute” Roshchin

Moscow, Russia

National Research Centre “Kurchatov Institute” Nuzhdin

Moscow, Russia

Pohang Accelerator Laboratory Lim

Pohang, South Korea

Ioffe Institute Lebedev

St. Petersburg, Russia

Ioffe Institute Ankudinov

St. Petersburg, Russia

Surface study by x-ray scattering technique and phase contrast imaging: the examples of graphene and sapphire Nano-roughness evaluation for the surface of epitaxial graphene and height measurement are considered for a microstep on as-grown surface of sapphire in order to provide homogeneous graphene films on large areas of silicon carbide or sapphire substrates. To investigate dissimilar surface properties, different approaches have been used: off-specular grazing incidence X-ray scattering and in-line phase contrast imaging with synchrotron radiation. Statistical and local parameters of two types of surface morphology are measured. For the graphene surface, the dependence of the root-mean-square roughness of terrace-step nanostructure on the direction of the steps is estimated. For the vicinal face of sapphire, a surface step height of about one micron is determined directly from a phase contrast image, proving for the first time that the phase contrast imaging resolves surface morphology on a micrometer scale. Atomic force microscopy confirmed the obtained results. 10.18149/MPM.5252024_7 Graphene epitaxial SiC sapphire ribbons X-ray scattering phase contrast imaging synchrotron radiation https://mpm.spbstu.ru/article/2024.104.7/ 7-Argunova.pdf

RAR RUS 74-82 Belarusian State University of Informatics and Radioelectronics Gladinov

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Boiprav Olga V.

Minsk, Belarus

Belarusian State University of Informatics and Radioelectronics Bogush

Minsk, Belarus

S-parameters of flexible electromagnetic radiation shields with Fe-Ni system coating The results of studies of 2.0–17.0 GHz frequency responses of S11 and S21 values of flexible electromagnetic radiation shields made of metallized polymer film, on the surface of which a coating of the Fe–Ni system is applied by electron beam evaporation, are presented. It has been experimentally established that an alloy in the Fe–Ni system containing 56 wt. % (~ 57 at. %) Fe and 44 wt. % (~ 43 at. %) Ni is azeotropic one. Such composition corresponds to the minimum temperature at which the total vapor pressure reaches 10 Pa. It has been determined that by applying of the Fe–Ni system coating with the specified content of components to the surface of a metallized polymer film, it is possible to reduce S11 value by a maximum of 5.0 dB and S21 value by a maximum of 6.7 dB in the frequency range of 2.0–17.0 GHz of this film. 10.18149/MPM.5252024_8 flexible shield electromagnetic radiation Fe–Ni system electron beam evaporation https://mpm.spbstu.ru/article/2024.104.8/ 8-Gladinov-et-al.pdf

RAR RUS 83-100 University of Relizane Berrahou

Relizane, Algeria

University of Relizane Zahraoui

Relizane, Algeria

University of Relizane Djabbar

Relizane, Algeria

University of Relizane Kamel

Relizane, Algeria

University of Relizane Benzinab

Relizane, Algeria

Numerical and experimental study of the effect of adhesive quality on the repair efficiency of corroded and cracked aluminum plate under mechanical loading A corroded aluminum plate with an inclined crack at the corrosion end was repaired by boron/epoxy composite patches, bonded with various adhesive types under mechanical loads. The aim of this study was to discover which glue types are better for the composite patch adhesive and the most efficient in transferring stresses from the aluminum plate to the patch, so in this study three-dimensional finite element analysis was used to study the changes in the damaged area of the adhesive (DR) and the stress factor (SIF) in the two modes (mode I KI and mode II KII), then compare them. To confirm the analytical results, we conducted a laboratory experiment using corroded aluminum plate 2024 with random cracks that were repaired with a composite patch affixed with several adhesive types, and then we calculated the ultimate tensile strength. The obtained results, both on the analytical and experimental side, showed that the adhesive type FM73 is more efficient in fixing the composite patch and more effective in transferring stress from the damaged plate towards the patch compared to the other materials used in this study (araldite, adekit and redux). 10.18149/MPM.5252024_9 composite corrosion mixed mode stress intensity factor SIF damaged area ratio DR ultimate tensile strength https://mpm.spbstu.ru/article/2024.104.9/ 9-Berrahou-_et-al.pdf

RAR RUS 101-111 Peter the Great St. Petersburg Polytechnic University Leonov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Skotnikova

St.Petersburg, Russia

Resistance of alloys in seawater Using the methods of optical metallography and scanning electron microscopy, a systematic study of the features of destruction of structurally and crystallographically textured titanium blanks after low-cycle tests in synthetic seawater containing 3.5 % NaCl was carried out. It is shown that corrosion-resistant structurally and crystallographically isolated regions with a basic orientation of the interface and a width of 20–30 µm, which periodically lay over the entire thickness of the workpiece in increments of 100–170 µm, are responsible for reducing fatigue life. The main types of corrosion of steels in sea water are considered. It is shown that for austenitic steels there is a duality regarding the presence of chlorine in seawater: it reduces the activity of microbiological corrosion but increases the risk of pitting and crevice corrosion. 10.18149/MPM.5252024_10 corrosion seawater microbiological pitting crevice corrosion and corrosion cracking https://mpm.spbstu.ru/article/2024.104.10/ 10-Leonov-et-al.pdf

RAR RUS 112-118 I.N. Ulyanov Chuvash State University Egorov E.N.

Cheboksary, Russia

I.N. Ulyanov Chuvash State University Kol’tsov

Cheboksary, Russia

The properties of rubber based on a combination of butadiene nitrile NBR 4045 and halobutyl CIIR and BIIR caoutchoucs The influence of chlorinated butyl rubber (CIIR) and bromobutyl rubber (BIIR) in combination with nitrile butadiene rubber NBR 4045 on the rheometric characteristics of the rubber compound, physico-mechanical, performance and dynamic properties of rubber is examinated. Along with rubber, the rubber compound contained a vulcanizing agent (sulfur), vulcanization accelerators (2,2′-dibenzthiazole disulfide, diphenylguanidine), vulcanization activators (zinc white, stearic acid), stabilizer (naphtham-2), softeners (rosin, SMPlast resin, bitumen petroleum, industrial oil I-12A), fillers (carbon blacks P 514 and P 803, natural chalk, trans-polynorbornene) and other ingredients. It has been established that the nature of halobutyl rubbers in combination with NBR 4045 rubber has virtually no effect on the maximum and minimum torques, and BIIR promotes a higher rate of vulcanization of the rubber mixture. Vulcanizates containing combinations of NBR 4045 rubber with halobutyl rubbers are characterized by almost identical physical and mechanical properties and, after exposure to sea water, their masses change slightly. Vulcanizate based on a combination of rubbers NBR 4045: BIIR = 75:25 parts per hundred parts of rubber (phr) has the least changes in physical and mechanical properties in sea water and advanced dynamic properties. 10.18149/MPM.5252024_11 physico-mechanical performance and dynamic properties butadiene-nitrile rubber halobutyl rubber vulcanized rubber rheometric https://mpm.spbstu.ru/article/2024.104.11/ 11-Egorov-et-al.pdf

RAR RUS 119-126 0000-0002-7682-9830 University of Tyumen Ganopolskij Rodion

Tyumen, Russia

0000-0003-0347-3930 University of Tyumen Fedorov Konstantin

Tyumen, Russia

Irkusk Oil Company LLC Gilmutdinov

Irkutsk, Russia

0000-0001-7790-9958 Irkusk Oil Company LLC Folomeev Alexey

Irkutsk, Russia

Development of the semi empirical approach on wormhole formation in carbonates Carbonate acidizing is a technology of well productivity stimulation in oil recovery practice. The maximum effect of such a well treatment is connected with acidizing channels formation of several millimeters in diameter (wormholes). One of the approaches to predict the acidizing effect of wormholing is the semi empirical simulation based on the results of the experiments of core plug channeling by acid injection. It was established that maximum of permeability improvement corresponds to the minimum of injected volume and is defined by wormhole breakthrough. Presentation of such equation in the dimensionless form involves dimensionless criteria such as Damköhler, Peclet, etc, that are defined by the results of the calculation and with experiment data matching. The new approach to derivate of the main equation defining the acid wormholing process is developed in the present paper. 10.18149/MPM.5252024_12 wormhole formation in carbonate core plug dimensionless numbers by Damköhler and Peclet acidizing of carbonate reservoir https://mpm.spbstu.ru/article/2024.104.12/ 12-Ganopolskij-et-al.pdf

RAR RUS 127-147 Peter the Great St. Petersburg Polytechnic University Melker A.I.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Krupina

St.Petersburg, Russia

Periodic system of fullerenes: the column of six-fold symmetry The possible ways of generation and growing the fullerenes having six-fold symmetry have been studied. Beginning with cyclohexane C6H12, benzol C6H6 and clusters C6C6, we obtained elementary fullerenes C12 and mini-fullerenes C24, which produce the fullerenes from C24 to C84; perfect (basic), as well as nanotubes. The basic fullerenes C24, C36, C48, C60, C72 and C84 have the ordinary six-fold symmetry. We have calculated their energies and discussed possible reasons for their dependence on a fullerene size and shape in the framework of the periodic system of fullerenes. 10.18149/MPM.5252024_13 carbon energy fullerene fusion reaction graph representation nanotube periodic system single and double bonds symmetry https://mpm.spbstu.ru/article/2024.104.13/ 13-Melker.pdf

RAR RUS 148-160 Peter the Great St. Petersburg Polytechnic University Melker A.I.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Krupina

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Zabrodkin

St. Petersburg, Russia

Changing symmetry during the growth of fullerenes originated from the nuclei of six-fold symmetry The possible ways of generation and growing the fullerenes having at first six-fold symmetry has been studied. Beginning with a hexagonal prism (elementary fullerene C12), six-cornered barrel-shaped fullerene C24 and high six-cornered barrel-shaped fullerene C36, we obtained their direct descendants throw the use of Endo-Kroto’s mechanism known as embedding carbon dimers. We have calculated the energies of the possible fullerenes and discussed possible reasons of their dependence on a fullerene size and shape. 10.18149/MPM.5252024_14 carbon center of curvature concentration energy fullerene fusion reaction graph representation periodic system single and double bonds symmetry https://mpm.spbstu.ru/article/2024.104.14/ 14-Melker.pdf