Materials physics and mechanics

RAR RUS 1-21 Kurukshetra University Sharma

Kurukshetra, India

Kishan Lal Public College Batra

Rewari, Haryana, India

59122315900 0000-0002-1572-2108 Kurukshetra University Kumar Rajneesh

Kurukshetra, India

Fractional strain analysis on reflection of plane waves at an impedance boundary of non-local swelling porous thermoelastic medium The current work focuses on developing a model to examine wave analysis in non-local swelling porous thermoelastic medium under fractional order strain. After converting the governing equations into two-dimensional and utilizing the dimensionless quantities for further simplification the Helmholtz decomposition theorem has been used to decompose the system into longitudinal and transverse components. The frequency dispersion relation is derived by assuming the plane wave solution in two-dimensional case for the given problem. It is found that there exist two dilatational waves, a thermal wave and two transversal waves travelling at distinct velocities. The amplitude ratios for the reflected waves are obtained with the aid of impedance boundary restrictions. The obtained amplitude ratios are used to obtain the energy ratios of different reflected waves. Influence of fractional order parameter on distinct types of wave speeds is illustrated graphically and it is observed that increase in fractional order parameter diminishes the magnitude of all existing waves except longitudinal wave in solid. Also impacts of swelling pores and fractional order on the attained energy ratios are displayed graphically versus angle of incidence. It is verified that during reflection phenomena, the sum of energy ratio is equal to unity at each angle of incidence and there is no dissipation on the boundary surface. Swelling porosity decrease the impact of energy ratios of reflected longitudinal wave and thermal wave for all values of fractional order parameter. Some unique cases are also presented. The results find application in geophysics, civil engineering and structure related issues. 10.18149/MPM.5312025_1 energy ratios reflection coefficients impedance border fractional order strain swelling porous https://mpm.spbstu.ru/article/2025.106.1/ 1-Sharma%2C-Batra%2C-Kumar.pdf

RAR RUS 22-37 Kurukshetra University Gupta

India

Baba Mastnath University Kumar

Haryana, India

Baba Mastnath University Goel

Haryana, India

Study of different theories of thermoelasticity under the Rayleigh wave propagation along an isothermal boundary The propagation of Rayleigh surface waves in an isotropic thermoelastic solid half-space is the focus of the current study, which takes into account the compact form of six distinct thermoelasticity theories. An isothermal boundary surface in the absence of tangential and normal stress is used to solve the problem. A dispersion equation with irrational terms is obtained after creating a mathematical model. This equation needs to be transformed into a rational polynomial equation in order to use the algebraic method to find exact complex roots. The roots are filters for in-homogenous wave propagation that decays with depth. Then these roots are used to compute the numerically characteristic properties of the Rayleigh wave, which include phase velocity, attenuation coefficient, and polarisation of particles. The results are presented graphically for particular cases of thermoelasticity by using the physical data of copper metal. 10.18149/MPM.5312025_2 coupled model G-N model three phase lag model L-S model phase velocity dual phase lag model G-L model attenuation coefficient https://mpm.spbstu.ru/article/2025.106.2/ MPM.5312025_2

RAR RUS 38-47 Ioffe Institute Hilarov

St. Petersburg, Russia

Ioffe Institute Damaskinskaya

St. Petersburg, Russia

Multifractal properties of breaking bonds coordinates in heterogeneous materials revealed by the discrete element method Using the discrete element method coordinates of elementary acoustic emission sources (breaking bonds) were calculated as a function of time for materials of different degrees of heterogeneity under mechanical loading. The time dependences of multifractal dimension spectra D(q) for these sources were calculated using the “sandbox” algorithm. The time behavior of spectra width w and box counting fractal dimension D0 was studied. A narrowing of the multifractal dimension spectra was discovered (fractal self-organization of acoustic emission) before the destruction of materials and its subsequent expansion after the formation of a main crack. The influence of physical properties of the polycrystalline grain boundaries on the strength and ductility of materials has been revealed. 10.18149/MPM.5312025_3 fracture of materials discrete element method multifractals self-organization https://mpm.spbstu.ru/article/2025.106.3/ 3-Hilarov.pdf

RAR RUS 48-56 Altai State Technical University Poletaev Gennady M.

Barnaul, Russia

Polzunov Altai State Technical University Bebikhov Yuriy V.

Barnaul, Russia

Polzunov Altai State Technical University Semenov Alexander S.

Barnaul, Russia

Altai State University Rakitin

Barnaul, Russia

Altai State Technical University Novoselova

Barnaul, Russia

Influence of free surface on melting and crystallization in nickel and copper: molecular dynamics simulation The influence of free surface on melting and crystallization processes in nickel and copper was studied using molecular dynamics simulation. It was shown that crystallographic orientation of the surface and, accordingly, the energy of atoms on the surface affect the melting onset temperature of the simulated metal cell. The melting onset temperatures from the surface are arranged in the following order of increase for the considered orientations: (110), (112), (100), (111). When studying the formation of crystalline nuclei during gradual cooling from the molten state, it was found that most of the nuclei are formed near the surface. The orientation of the crystal structure in the nuclei near the surface in most cases was such that the crystalline plane (111) was formed on the surface, which is the most energetically favorable. 10.18149/MPM.5312025_4 molecular dynamics melting crystallization surface https://mpm.spbstu.ru/article/2025.106.4/ 4-Poletaev-et-al.pdf

RAR RUS 57-67 St. Petersburg State University Resnina

St. Petersburg, Russia

St. Petersburg State University Belyaev

St. Petersburg, Russia

National University of Science and Technology "MISIS" Bazlov

Moscow, Russia

St. Petersburg State University Sibirev

St. Petersburg, Russia

St. Petersburg State University Ponikarova

St. Petersburg, Russia

St. Petersburg State University Trofimova

St. Petersburg, Russia

St. Petersburg State University Ivanov

St. Petersburg, Russia

St. Petersburg State University Bikbaev

St. Petersburg, Russia

Thermal cycling stability of the martensitic transformation in Ti40.7Hf9.5Ni49.8-xCux (x = 1, 5 or 10 at. %) cast alloys The martensitic transformation and the defect density variation were studied during 500 thermal cycles of the Ti40.7Hf9.5Ni49.8-xCux shape memory alloys with various copper concentration (x = 1, 5 or 10 at. %). It was found that regardless the Cu content, the transformation temperatures decreased on thermal cycling. An increase in the Cu concentration led to alloys hardening but it did not improve thermal cycling stability. The variation in the defect density on thermal cycling did not correlate with the yield limit for dislocation slip measured in samples before cycling. The variation in the defect density variation did not correlate with the variation in the transformation temperatures on thermal cycling. This showed that the variation in defect density was not the only reason for the variation in the transformation temperatures on thermal cycling of cast Ti-Hf-Ni-Cu alloys. 10.18149/MPM.5312025_5 shape memory alloys thermal cycling stability martensitic transformation alloy hardening https://mpm.spbstu.ru/article/2025.106.5/ 5-Resnina-N-et-al.pdf

RAR RUS 68-77 Saint Petersburg State University E.G. Zemtsova

St.Petersburg, Russia

Institute for Problems of Mechanical Engineering of the RAS Semenov

St.Petersburg, Russia

7005573911 St.Petersburg State University Morozov N.F.

St.Petersburg, Russia

St. Petersburg State University Sidorov

St. Petersburg, Russia

St. Petersburg State University of Film and Television Kudymov

St. Petersburg, Russia

Saint Petersburg State University Smirnov

St.Petersburg, Russia

Creation of aluminum matrix composites reinforced with micro- and nanoparticles of titanium carbide with nickel coating and description of their hardening mechanisms During the high-temperature synthesis of carbide reinforced Al matrix composites, as a result of a chemical reaction between carbide particles and a metal matrix, aluminum carbide is formed, which embrittles the system. To eliminate the negative effect of aluminum carbide in the material, the dispersed phase of TiC was pre-metallized with a thin Ni layer. Our work also evaluates the effect of Ni-plated particles of TiC and aluminum nickelide, formed as a result of the chemical reaction of Ni with molten Al, on the hardening of the Al matrix composite. The mechanisms of hardening of the aluminum matrix composites with a dispersed phase of micro- and nanometer size are proposed. The analysis of the contributions of the above mechanisms to the hardening of the TiC reinforced Al composite considered in this article, shows that the main contribution to the hardening due to the low bulk concentration of reinforcing particles is provided by the dispersion hardening Orowan-Ashby mechanism and the dislocation mechanism caused by a thermal expansion coefficients mismatch between the matrix and reinforcing particles. 10.18149/MPM.5312025_6 composite materials ceramic nanoparticles aluminum mechanical properties https://mpm.spbstu.ru/article/2025.106.6/ 6-Zemtsova-EG-et-al.pdf

RAR RUS 78-88 Peter the Great St. Petersburg Polytechnic University Zisman

St.Petersburg, Russia

0000-0002-0185-5452 Peter the Great St. Petersburg Polytechnic University Zolotorevsky

St.Petersburg, Russia

Institute for Problems in Mechanical Engineering of the Russian Academy of Science Petrov

St. Petersburg, Russia

National research centre “Kurchatov Institute” - Central Research Institute of Structural Materials “PROMETEY” Petrov

St.Petersburg, Russia

EBSD on bainitic steel to assess parent austenite state after multi-pass hot rolling: Textural analysis versus reconstruction of prior grains Owing to inter-phase orientation relationship, EBSD analysis of martensitic or bainitic steel enables reconstruction of prior grains. Thus, assessment of the treatment conditions remains possible even if the chemical etching cannot properly reveal the parent structure. However, such an approach is hardly applicable to the industrial modes of multi-pass rolling. Unlike a single thickness reduction, small strains per pass followed by a kind of annealing in inter-pass pauses cause specific mechanisms of austenite recrystallization so that the latter becomes difficult to be assessed in morphological terms. At the same time, the textural analysis enables estimation of the parent state using whether the texture of reconstructed austenite or the measured transformation texture. When tested on low carbon bainitic steel, both methods lead to close estimates of the parent texture and thus support each other. 10.18149/MPM.5312025_7 austenite bainite martensite martensite hot rolling prior grains transformation texture EBSD https://mpm.spbstu.ru/article/2025.106.7/ 7-Zisman-et-al.pdf

RAR RUS 89-108 Institute for Metals Superplasticity Problems of RAS Sitdikov

Ufa, Russia

Structural changes in a commercial Al-Cu alloy during hot equal channel angular pressing The evolution of the structure of aluminum alloy 2219 ingot during equal channel angular pressing (ECAP) to a cumulative strain of e = 12 at 475 °C (~0.8Tm) was studied. It was found that the structural changes during hot ECAP were determined by the action of two main structural processes. In the early stages of ECAP (e = 1–3), the alignment of the initial grains in the pressing direction was mainly accompanied by the formation of a dynamically equilibrated subgrain structure. However, upon reaching a critical strain (e ≈ 3–4), grain fragmentation by deformation/microshear bands started with a subsequent gradual increase in the number of bands and their misorientation, leading to grain refinement. As a result, a heterogeneous bimodal grain structure was formed after e = 12, consisting of about 50 % new grains of about 10 μm size and residual fragments of the initial grains containing subgrains. It was concluded that grain refinement during hot ECAP occurred by the mechanism of continuous dynamic recrystallization. 10.18149/MPM.5312025_8 aluminium alloy 2219 equal channel angular pressing ECAP microstructural evolution grain refinement https://mpm.spbstu.ru/article/2025.106.8/ 8-Sitdikov.pdf

RAR RUS 109-116 Eötvös Loránd University Mukhtarova

Budapest, Hungary

Institute for Metals Superplasticity Problems of RAS Shakhov

Ufa, Russia

Institute for Metals Superplasticity Problems of RAS Mukhtarov

Ufa, Russia

Effect of high pressure torsion and annealing on the microstructure and microhardness of Inconel 718 produced by selective laser melting Comparative study of Inconel 718 nickel-base superalloy produced by selective laser melting (SLM) and conventional technology was carried out. The SLM Inconel 718 microstructure consists of g grains, surrounded by d phase plates and small carbides. g¢¢ and g¢ precipitates were present within the g subgrains. The d phase plates are mainly located along grain boundaries like in conventional Inconel 718. The g grains consist of columnar and equiaxed subgrains. Study of microstructure showed that the columnar subgrains in their turn consisted of equiaxed subgrains. The SLM material features a developed substructure in g grains, and dispersed precipitates, oxides along subgrain boundaries. SLM Inconel 718 and conventional Inconel 718 were subjected to high pressure torsion (HPT), which resulted in microstructure refining down to nanocrystalline size and partial dissolution of Nb containing g¢¢ and d phases. d phase particles were revealed more clearly after subsequent annealing at the temperature close to aging temperature like in conventional superalloy. Nanostructure of SLM Inconel 718 formed by HPT had duplex (g + d) structure and was found to be thermally stable at 600 °C during 2 h. Annealing of the SLM Inconel 718 led to superior microhardness (956.46 HV), which was slightly higher than that of the conventional superalloy. 10.18149/MPM.5312025_9 nickel-based superalloy microstructure grain boundary selective laser melting severe plastic deformation high pressure torsion nanostructure annealing microhardness https://mpm.spbstu.ru/article/2025.106.9/ 9-Mukhtarova-KS-et-al.pdf

REV RUS 117-142 National Institute of Technology Jalandhar Kumar A.

Jalandhar (Punjab), India

National Institute of Technology Jalandhar Bedi

Jalandhar (Punjab), India

Mechanical and durability properties of sustainable composites derived from recycled polyethylene terephthalate and enhanced with natural fibers: a comprehensive review Pursuing sustainable and environment-friendly materials has spurred a paradigm shift in composite materials, with an increasing focus on composite materials with natural fibers as reinforcement. An in-depth study of composites crafted from natural fibers and recycled polyethylene terephthalate (rPET) as matrix is presented in this comprehensive review. The cellulosic fibers offer an eco-friendly alternative to synthetic reinforcements with attributes such as high tensile strength, low density, easy availability in abundance at low cost, and biodegradability. When incorporated into composites, they improve the mechanical behavior, and there is less material consumption, making it preferable for lightweight applications. Conversely, using rPET represents an innovative step in addressing the environmental challenges of using traditional petroleum-based plastics. The rPET matrix, derived from the chemical recycling of used PET bottles, is a promising material for developing environmentally conscious composites. The discussion includes mechanical properties and extends to the durability behavior of these composites, evaluating their resistance to moisture, UV radiation, and temperature variations: durability, resistance to deterioration, and performance of the composite materials under actual situations. The review concludes by exploring current challenges and limitations, highlighting areas for future research and development. 10.18149/MPM.5312025_10 sustainability NFRCs rPET mechanical performance surface modification durability behavior https://mpm.spbstu.ru/article/2025.106.10/ 10-Kumar-Ajay.pdf

RAR RUS 143-149 I.N. Ulyanov Chuvash State University Egorov E.N.

Cheboksary, Russia

I.N. Ulyanov Chuvash State University Kol’tsov

Cheboksary, Russia

The influence of brombutyl and divinylstyrene caoutchoucs, sevilen on the properties of seawater-resistant rubber The effect of bromobutyl caoutchouc BBK-232, sevilene 11808-340, divinylstyrene caoutchoucs DSSK-628V and SKMS-30ARK on the rheometric characteristics of the rubber mixture, physical, mechanical, operational and dynamic properties of rubber used for the manufacture of seawater-resistant products are studied. Along with the listed ingredients, the rubber mixture contained a vulcanizing agent - sulfur; vulcanization accelerators - 2,2'-dibenzothiazole disulfide, diphenylguanidine; vulcanization activators - zinc white, stearin; antioxidant - naphtham-2; fillers - technical carbons P 514 and P 803, natural chalk; polymer filler - trans-polynorbornene; softeners - rosin, petroleum polymer resin "Shinplast", factice; plasticizer - petroleum bitumen. It was found that rubber based on DSSK-628V and BBK-232 couutchoucs with their mass ratio of 75:25 not containing sevilen 11808-340 has better rheometric, physical-mechanical, dynamic properties and resistance to sea water. 10.18149/MPM.5312025_11 physical-mechanical and operational and dynamic properties bromobutyl caoutchouc sevilen rubber divinylstyrene caoutchous rheometric sea water https://mpm.spbstu.ru/article/2025.106.11/ 11-Egorov-EN%2C-Kol%E2%80%99tsov-NI.pdf

RAR RUS 150-158 Rajamangala University of Technology Isan Sakonnakhon Campus Moonphukhiao

Phangkon, Sakonnakhon, Thailand

Nakhon Phanom University Samran

Nakhon Phanom, Thailand

Rajamangala University of Technology Isan Sakonnakhon Campus Chaiwichian

Sakonnakhon, Thailand

Preparation and characterization of geopolymer/activated carbon composite materials used as a bone substitute material Geopolymer/activated carbon composite materials were successfully prepared using alkaline activator solution to be a binder. The physical and mechanical properties of as-prepared samples were characterized through X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectrometry and compressive strength techniques. Results revealed that geopolymer/activated carbon composite materials exhibited amorphous phase and spherical-like and plate-like morphologies. Fourier transform infrared spectrometry results indicated that after the geopolymerization reaction, the band at 977 cm-1 was shifted to lower wavenumber (975 cm-1). This might be attributed to the interaction of aluminum atoms and the formation of higher cross-linking in silicate geopolymer structure. The compressive strength of geopolymer/activated carbon composite materials decreased with increasing amount of activated carbon in geopolymer. It was found that the concentration of 0.001 mol. % activated carbon introduced into geopolymer gave the highest strength compared with other samples. 10.18149/MPM.5312025_12 geopolymer activated carbon alkaline activator geopolymerization reaction https://mpm.spbstu.ru/article/2025.106.12/ 12-Saranyoo-Chaiwichian-et-al.pdf

RAR RUS 159-164 Peter the Great St. Petersburg Polytechnic University Romanov V.V.

St. Petersburg, Russia

Ioffe Institute Rul' N.I.

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Gasumyants Vitaliy

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Venevtsev

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Taranets

St.Petersburg, Russia

M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences Korolev

Ekaterinburg, Russia

P-4505-2016 7006034020 0000-0002-2973-8645 Institute of Problems of Mechanical Engineering RAS Kukushkin S.A. sergey,a.kukushkin@gmail.com

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS Osipov A.V.

St.Petersburg, Russia

0000-0001-8286-3472 Ioffe Institute Bagraev N.T.

St.Petersburg, Russia

Magnetism of the hybrid SiC/Si structure grown on silicon surface A low-dimensional hybrid structure of silicon carbide grown on silicon by the vacancy method of coordinated substitution of atoms based on the measurements of its magnetic characteristics – magnetic susceptibility and magnetization is studied. The measurements were carried out on the Quantum Design MPMS XL SQUID (superconducting quantum interferometer), M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg, and Faraday Balance (Faraday method), Peter the Great St. Petersburg Polytechnic University, St. Petersburg. The results of magnetization field dependences measurement, carried out by two experimental setups, clearly confirm the reliability of the obtained results. 10.18149/MPM.5312025_13 hybrid structure silicon carbide VMCSA magnetic properties superconducting quantum interferometer Faraday method magnetization https://mpm.spbstu.ru/article/2025.106.13/ 13-VV-Romanov-et-al.pdf