Materials physics and mechanics

RAR RUS 1-19 Belgorod National Research University Nikitin I.S.

Belgorod, Russia

Belgorod National Research University Voropaeva E.A.

Belgorod, Russia

Belgorod National Research University Semenyuk A.O.

Belgorod, Russia

Belgorod National Research University Chernichenko R.S.

Belgorod, Russia

Belgorod National Research University Dolzhenko P.D.

Belgorod, Russia

Belgorod National Research University Borisov S.I.

Belgorod, Russia

Belgorod National Research University Kalinenko A.A.

Belgorod, Russia

Belgorod National Research University Kaliuzhnaya E.V.

Belgorod, Russia

Belgorod National Research University Zuiko I.S.

Belgorod, Russia

Shandong University Shi L.

Jinan, China

Shandong University Wu Ch.

Jinan, China

Belgorod National Research University Mironov S.Yu.

Belgorod, Russia

EBSD study of microstructure produced during laser powder bed fusion of 17-4 PH martensitic steel Electron backscatter diffraction was applied to investigate the broad aspects of the microstructure produced during laser powder beam fusion of 17-4 PH steel. It was found that the laser powder beam fusion process involved the d-ferrite-to-austenite-to-martensite phase transformation sequence. Remarkably, the solidification + fiber texture in d-ferrite was essentially inherited by the final martensitic phase, i.e., the texture-memory effect was observed. It was also revealed that the d-ferrite-to-austenite transformation involved a strict selection of crystallographic variants. This led to a pronounced crystallographic preference of 60° boundaries in the austenitic phase. The core result of this study was an integral pattern of microstructural changes during laser powder beam fusion from a solidification stage down to ambient conditions. 10.18149/MPM.5432026_1 martensitic steels laser powder bed fusion electron backscatter diffraction microstructure texture https://mpm.spbstu.ru/article/2026.114.1/ 1_mironov_syu_et_al.pdf

RAR RUS 20-31 National Research Tomsk State University Eftifeeva A.S.

Tomsk, Russia

National Research Tomsk State University Panchenko E.Y.

Tomsk, Russia

National Research Tomsk State University Fatkullin I.D.

Tomsk, Russia

National Research Tomsk State University Zherdeva M.V.

Tomsk, Russia

National Research Tomsk State University Ryzhakova V.G.

Tomsk, Russia

National Research Tomsk State University Chumlyakov Y.I.

Tomsk, Russia

Influence of aging in B2-austenite phase on stress-induced martensitic transformation for [001]B2-oriented Co35Ni35Al28Fe2 single crystals The effect of aging in the high-temperature B2-phase on the martensitic transformation, the strength properties of L1₀-martensite, and the cyclic stability of superelasticity in compression in [001]B2-oriented Co35Ni35Al28Fe2 single crystals was investigated. The B2-phase in quenched Co35Ni35Al28Fe2 single crystals remains stable without precipitation of secondary phases upon heating up to 520 K, which represents an increase of approximately 50 K compared to ternary Co35Ni35Al30 alloys. Aging at 673 K leads to the precipitation of nanosized (Ni,Co)5Al3-particles providing dispersion strengthening. Short-term aging for 15 min decreases the start B2-L10 martensitic transformation temperature Ms by 140 K and significantly improves functional properties, resulting in a wide temperature range of superelasticity (345 K) and high strength properties of L10-martensite (> 1870 MPa) while maintaining cyclic stability of superelasticity. 10.18149/MPM.5432026_2 single crystals martensitic transformation aging strengthening particles superelasticity yield stress https://mpm.spbstu.ru/article/2026.114.2/ 2_eftifeeva_et_al.pdf

RAR RUS 32-41 Nosov Magnitogorsk State Technical University Korchunov A.G.

Magnitogorsk, Russia

Nosov Magnitogorsk State Technical University Efimova Yu.Yu.

Magnitogorsk, Russia

Nosov Magnitogorsk State Technical University Pivovarova K.G.

Magnitogorsk, Russia

OJSK Magnitogorsk hardware and sizing plant “MMK-METIZ” Stolyarov A.Yu.

Magnitogorsk, Russia

OJSK Magnitogorsk hardware and sizing plant “MMK-METIZ” Yazvenko A.M.

Magnitogorsk, Russia

Microstructural and chemical features of a zinc-aluminum coating on high-strength eutectoid steel wire microalloyed with vanadium This paper presents a comprehensive study of the processes involved in applying zinc-aluminum coatings onto high-strength eutectoid steel wire microalloyed with vanadium. The study provides description of surface preparation methods, such as fluxing in ZnCl₂ and FeCl₂ solutions, followed by hot-dip galvanizing and zinc-aluminizing at elevated temperatures. Particular attention is given to microstructural analysis of the coatings using optical microscopy, scanning electron microscopy, and X-ray microanalysis. As a result, structural zones of the coatings, their elemental composition, thickness, and microhardness were identified. The research revealed that the zinc-aluminum coating structure consists of layers with different crystalline phases — namely η-, ζ-, and δ-phases — along with the presence of iron, aluminum, and zinc in various zones. Elemental distribution analysis across the wire cross-section confirmed coating homogeneity and internal diffusion. An important aspect of the work was the evaluation of microhardness changes in the steel core after coating application. This study contributes to the development of protective coating technologies for fasteners, expands understanding of the structure and properties of zinc-aluminum layers, and highlights the need for further improvements to enhance the stability and performance of protective coatings under operating conditions. 10.18149/MPM.5432026_3 eutectoid steel microalloyed with vanadium high-strength wire galvanizing microstructure coating zinc-aluminizing phases chemical composition microhardness https://mpm.spbstu.ru/article/2026.114.3/ 3_korchunov_et_al.pdf

RAR RUS 42-53 Institute for Problems of Mechanical Engineering RAS Meshcheryakov Yu.I.

St.Petersburg, Russia

Institute for Problems of Mechanical Engineering RAS Divakov

St.Petersburg, Russia

St. Petersburg Institute of Technology (Technical University) Gaikov A.L.

St. Petersburg, Russia

Institute for Problems of Mechanical Engineering RAS Konovalov G.V.

St.Petersburg, Russia

Institute of Problems of Mechanical Engineering RAS Zhigacheva

St.Petersburg, Russia

Stochasticity of dynamic straining and high-velocity ejection of particles under shock loading Shock-tests of 1565 aluminum alloy under uniaxial strain conditions show that within local regions of target of 100–200 µm a significant increase in mass velocity occurs. Microstructural investigations of specimens revealed a presence of traces of local deformation in the form of narrow shear bands directed perpendicular to the free surface of the target. Simultaneously an ejection of particles from the back side of the target occurs. The discovered phenomenon correlates with the stochastic character of mesostructure behavior at the mesoscopic scale level. Theoretically, the stochasticity of shock-wave propagation in shock deformed solids is taken into account by using the mesoparticle velocity distribution function which is incorporated into the Klein-Gordon equation. The solution to this equation shows that shock-wave amplitude is determined by the relationship between viscosity and velocity variation of mesostructure. 10.18149/MPM.5432026_4 mesoparticle stochasticity ejection scale alloy impact shock-wave https://mpm.spbstu.ru/article/2026.114.4/ 4_konovalov_gv_et_al.pdf

RAR RUS 54-63 St. Petersburg, Russia Astapov Ya.K. Peter the Great St. Petersburg Polytechnic University Lukin A.V.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Popov I.A.

St.Petersburg, Russia

A refined model of thermoelastic energy dissipation in microbeam resonators Thermoelastic damping is one of the main mechanisms of energy loss in nano- and microresonators. Thermoelastic damping assessment is traditionally explored for thermal boundary conditions of thermal insulation. In this work a classical Lifshitz-Roukes’ model is extended to the case of a generalized Newton’s law of cooling. Based on Bernoulli-Euler beam model, refined analytical expressions for complex eigenfrequencies and quality factor damping coefficient are derived. Taking into account heat flow in the longitudinal direction of the resonator. The results reveal that there are three qualitatively different cases, corresponding to thermal boundary conditions of thermal insulation, constant temperature and a mixture of both. Additionally, it is shown that the profile of each case significantly relies on geometric properties of the model. 10.18149/MPM.5432026_5 MEMS thermoelastic damping Newton’s law of cooling heat transfer in solids https://mpm.spbstu.ru/article/2026.114.5/ 5_astapov_et_al.pdf

RAR RUS 64-84 55632460600 University of Houston Sharma Saurav

Houston, Texas, USA

Kishan Lal Public College Batra D.

Rewari, Haryana, India

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

Kurukshetra, India

Wave reflection analysis in nonlocal porous thermoelastic media under hyperbolic two-temperature and higher-order Green-Lindsay models The reflection behavior of plane waves in a nonlocal porous thermoelastic half-space incorporating hyperbolic two-temperature effects under impedance boundary conditions within the framework of refined the Green-Lindsay theory is investigated. The formulation accounts for nonlocal elasticity, thermal relaxation, and porous interactions, leading to the propagation of four distinct wave modes, namely primary, thermal, porous, and shear vertical waves, each with different phase velocities. Reflection coefficients are derived analytically, and corresponding energy ratios are computed to examine the influence of hyperbolic two-temperature, two-temperature, and one-temperature models, as well as comparisons between the refined Green–Lindsay and simple Green–Lindsay theories. Numerical results reveal strong sensitivity of energy partition to both angle of incidence and thermal parameters. In particular, hyperbolic two-temperature effects significantly modify energy distribution, leading to pronounced deviations from classical the one-temperature model predictions, especially for primary and shear vertical waves incidences. The refined Green–Lindsay model consistently produces higher and more stable energy ratios compared to the simple Green–Lindsay model, indicating improved representation of thermo-mechanical coupling and relaxation effects. Oscillatory behaviour is observed in several reflected energy components, highlighting the combined influence of nonlocality and thermal phase lags on wave interactions. The results demonstrate that the inclusion of hyperbolic two-temperature and nonlocal effects provides a more refined and physically consistent description of wave propagation in porous media. These findings are of practical importance in applications such as soil mechanics, geophysics, and civil engineering, where accurate prediction of wave reflection and energy distribution under thermal loading conditions is essential. 10.18149/MPM.5432026_6 porous mediu reflection impedance boundary amplitude ratios energy ratios https://mpm.spbstu.ru/article/2026.114.6/ 6_sharma_.pdf

RAR RUS 85-92 Andhra University Swathi Ch.

Andhra Pradesh, India

GITAM (Deemed to be University) Jagadeesh Chandra S.V.

Andhra Pradesh, India

GITAM (Deemed to be University) Rajesh Kumar B.

Andhra Pradesh, India

Andhra University Srinivasa Rao Y.

Andhra Pradesh, India

Lakireddy Bali Reddy College of Engineering Krishna Rao E.V.

Andhra Pradesh, India

Andhra University Rama Koti Reddy D.V.

Andhra Pradesh, India

Electrical properties of Nd doped barium zirconium titanate perovskite ceramics Barium zirconium titanate ceramics were prepared via the conventional solid-state reaction method. The influence of Nd³⁺ ion substitution on the ferroelectric and dielectric characteristics of barium zirconium titanate is investigated. To assess the thermal stability of Nd-doped samples, calcination was performed at temperatures of 1150, 1200, 1250, 1300, and 1350 °C for 4 h. The ferroelectric behavior of the doped ceramics was analyzed using polarisation-electric field hysteresis loops recorded at room temperature and 50 Hz, revealing improved energy storage density. Dielectric measurements, conducted over a frequency range of 1 kHz to 1 MHz with an impedance analyzer, indicated an increase in dielectric constant upon Nd addition. The BNZT-3 composition exhibited the highest remanent polarisation (Pᵣ = 14.12 µC·cm⁻²), highlighting its superior energy storage performance. Moreover, the materials demonstrated DC conductivity in the range of (1.26–8.37) × 10⁻⁶ S·m⁻¹, confirming enhanced electrical properties. 10.18149/MPM.5432026_7 barium zirconium titanate solid state reaction method ferroelectric properties dielectric properties https://mpm.spbstu.ru/article/2026.114.7/ 7_jagadesh_chandra_et_al.pdf

RAR RUS 93-103 International Islamic University Imran M.

Islamabad, Pakistan

International Islamic University Rafai A.

Islamabad, Pakistan

Fabrication of Ag/rGO/TiO2 nanocomposite-based electron transport layer for enhanced efficiency in planar perovskite solar cells The global transition toward renewable energy sources necessitates the development of cost-effective and high-efficiency photovoltaic technologies. Perovskite solar cells have emerged as promising candidates due to their exceptional optoelectronic properties. However, achieving enhanced efficiency and stability requires optimization of charge transport layers. In this work, we synthesized a ternary Ag/rGO/TiO2 nanocomposite via facile a hydrothermal method as an advanced electron transport layer for planar perovskite solar cells. Comprehensive characterization revealed well-distributed Ag nanoparticles and rGO nanosheets within anatase TiO2 structure. The optimized device demonstrated a power conversion efficiency of 8.72 % with a short-circuit current density of 14.98 mA·cm-2, an open-circuit voltage of 0.99 V, and a fill factor of 58.83 %, representing 24.9 % enhancement over the pristine TiO2 reference device. Photoluminescence quenching studies confirmed a superior electron extraction efficiency of 84 %. It was demonstrated that the strategic incorporation of plasmonic and carbonaceous nanomaterials into metal oxide electron transport layers offers viable pathway toward high-performance perovskite photovoltaics. 10.18149/MPM.5432026_8 perovskite solar cells electron transport layer titanium dioxide silver nanoparticles reduced graphene oxide hydrothermal synthesis charge transport nanocomposite https://mpm.spbstu.ru/article/2026.114.8/ 8_imran.pdf

RAR RUS 104-119 VNR Vignana Jyothi Institute of Engineering and Technology Srinivasa Rao L.

Hyderabad, Telangana, India

VNR Vignana Jyothi Institute of Engineering and Technology Jyotsna C.

Hyderabad, Telangana, India

VNR Vignana Jyothi Institute of Engineering and Technology Pothanna N.

Hyderabad, Telangana, India

VNR Vignana Jyothi Institute of Engineering and Technology Vijaya Saraswathi R.

Hyderabad, Telangana, India

B.V. Raju Institute of Technology Prabhatha Sindu Sri L.

Narsapur, Telangana, India

Ruhr-University Bochum Sahith B.

Bochum, Germany

Synthesis and characterization of corn starch based biodegradable plastic: microstructural, structural, and decomposition studies for potential applications This study focuses on the synthesis and characterization of biodegradable plastics using corn flour, vinegar, glycerin, and varying amounts of water. The biodegradable plastics were synthesized via a two-step process involving solvent casting and controlled physical foaming. X-ray diffraction patterns exhibited broad amorphous halos centered at 2θ ≈ 19.6°, alongside weak peaks at 15.1 and 23.3°, indicating a semi-crystalline nature. Scanning electron microscopy displayed a heterogeneous grain surface of starch granules with an average pore size of ~ 119–585 μm2. The prepared biodegradable plastics have the highest porosity (~ 31.67 %), depicting a loosely packed amorphous nature. Energy dispersion spectroscopy provided the elemental analysis of starch-based biopolymers. Fourier-transform infrared spectra showcased functional groups viz., hydroxyl (O–H) at ~ 3340–3365 cm-1, carbonyl (C=O) at ~ 1717–1735 cm-1, and glycosidic linkages (α-1,4) at ~ 917–926 cm-1. The bioplastic samples have considerable degradation (up to 84.298 %) in red soil in a week. Thus, such starch-based bioplastics can be used as alternatives to conventional plastics. 10.18149/MPM.5432026_9 bioplastics solution casting U-net model porosity FTIR spectra biodegradability https://mpm.spbstu.ru/article/2026.114.9/ 9_linganaboina_srinivasa_rao_et_al_.pdf

RAR RUS 120-136 University Mustapha Stambouli Houari T.

Mascara, Algeria

University Mustapha Stambouli Khellafi H.

Mascara, Algeria

University Mustapha Stambouli Ould Chikh E.

Mascara, Algeria

University Mustapha Stambouli Meddah H.M.

Mascara, Algeria

University Mustapha Stambouli Bendouba M.

Mascara, Algeria

0000-0002-6595-5786 University of Sidi Bel Abbes Benguediab M.

Sidi Bel Abbe`s, Algeria

Mechanical response of polyvinyl chloride under various stress triaxiality levels Polyvinyl chloride is a thermoplastic material commonly employed in various engineering applications. The material properties of polyvinyl chloride have been observed to vary significantly with the applied loading conditions. A comprehensive knowledge of the deformation and failure characteristics of the material is necessary for evaluating its performance in engineering applications. In the present work, the stress response of the material is studied by subjecting flat and notched polyvinyl chloride specimens of various geometries to uniaxial tensile testing. The tests were conducted at room temperature and over a range of strain rates, namely 10⁻³, 10⁻², and 10⁻¹ s⁻¹. In addition, tests were also conducted for a range of loading rates from 0.2 to 1.4 mm/s to explore the combined effect of strain rate and stress triaxiality. The results of the experiments indicate a three-stage deformation process of the material: viscoelastic deformation, necking and plastic flow, and a hardening process due to cavitation. An increase in the rate of strain results in an increase in the elastic modulus, yield strength, ultimate strength, and strain at fracture. The geometry of the test specimen also has a strong influence on the results. The effects of stress triaxiality and reduced ductility are related to the radius of curvature of the test specimen. The larger the radius of curvature of the test specimen, the more deformable the material. In addition, these results highlight the interaction between strain rate and stress state on the mechanical response and failure of polyvinyl chloride, providing a solid experimental basis for formulating models for the nonlinear elasto-viscoplastic response of the material. 10.18149/MPM.5432026_10 polymeric materials PVC experimental characterization uniaxial tension plasticity damage initiation elasto-viscoplastic behavior https://mpm.spbstu.ru/article/2026.114.10/ 10_houari_et_al.pdf

RAR RUS 137-147 Pryazovskyi State Technical University Burlakov V.I.

Mariupol, Russia

Pryazovskyi State Technical University Burlakova G.Yu.

Mariupol, Russia

Peter the Great St. Petersburg Polytechnic University Artiukh V.G.

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kitaeva D.A.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Korihin N.V.

St. Petersburg, Russia

Study of performance of vibration treatment of mechanical equipment details Finishing and cleaning treatments of surface of details (for the purpose of cleaning details), removal of burrs, rounding off sharp edges, are preparing surfaces for coatings by grinding and polishing are used in all branches of industry, especially widely in mechanical engineering and instrument making. The essence of volumetric vibro-abrasive treatment is that details to be machined with abrasive bodies are placed in a container that is imparted with oscillatory motion at a certain frequency. Microparticles of metal are removed from treated surfaces due to the relative movement and pressure between abrasive granules and details caused by container vibrations. Factors that influence the intensity of processing are shown. Equations for the relative motion of loading granules and the working medium have been compiled. Dynamic equations for the relative motion of loading elements are obtained. Influence of the container shape on the process of vibration treatment of small flat details was investigated. Features of the dynamics of boundary elements of the loading mass are considered. The influence of vertical and horizontal movement of the container on the details is considered. 10.18149/MPM.5432026_11 container shape vibration treatment container granule transfer inertial force relative motion equations of container motion https://mpm.spbstu.ru/article/2026.114.11/ 11_burlakov_vi_et_al_.pdf

UNK RUS 148-162 National Institute of Technology Kurukshetra Yadav A.

Kurukshetra, India

National Institute of Technology Kurukshetra Jain A.

Kurukshetra, India

National Institute of Technology Kurukshetra Verma R.

Kurukshetra, India

Thermal-mechanical response to plunge depth variation in friction stir lap welding of AA6061 and SS304-computational fluid dynamics approach The influence of plunge depth on key thermo-mechanical performance indicators during dissimilar friction stir lap welding of AA6061 and SS304 using a finite volume method-based computational fluid-dynamics model is investigated. Simulations were conducted for plunge depth values ranging from 0 to 0.45 mm while maintaining constant rotational speed (1200 rpm), traverse speed (100 mm/min), and tool tilt angle (1.5°). The results show that the maximum workpiece temperature remains nearly constant at ~ 978 K across all plunge depth values, indicating minimal influence of plunge depth on overall heat generation. However, weld interface characteristics vary significantly with plunge depth. The maximum weld interface temperature increases from 743 to 791 K (~ 6.5 %), demonstrating enhanced interfacial heat transfer. Similarly, the maximum weld interface velocity increased from 0.07865 to 0.08121 m/s (~ 3.25 %), indicating improved material flow. In contrast, the minimum weld interface viscosity decreases from 8.94 × 10⁵ to 6.82 × 10⁵ kg/(ms) (~ 23.7 %), reflecting increased material softening. Tool-workpiece interface torque reduces from 14.96 to 13.91 Nm (~ 7 %), suggesting lower resistance to tool motion. These findings indicate that increasing plunge depth enhances bonding and material mixing, with an optimal plunge depth range of 0.15–0.30 mm for balanced weld quality and stability. 10.18149/MPM.5432026_12 friction stir weld computational fluid-dynamics finite-volume approach ANSYS fluent https://mpm.spbstu.ru/article/2026.114.12/ 12_yadav_a_et_al.pdf

RAR RUS 163-175 Peter the Great St. Petersburg Polytechnic University Rudskoy Andrey

St.Petersburg, Russia

T-5749-2017 6602123579 0000-0002-2102-1076 Peter the Great St. Petersburg Polytechnic University Kodzhaspirov Georgij kodjaspirov@spbstu.ru

St.Petersburg, Russia

Simulation of recrystallization and mechanical properties under hot rolling and high temperature thermomechanical treatment Experimental design and the finite element method were used for the simulation of dynamic and static recrystallization and mechanical properties of steels under hot rolling and high-temperature thermomechanical treatment conditions. It is proposed that a recrystallization diagram of a special type could be used for the quantitative estimation of dynamic and static recrystallization development. The latter depends on the main high temperature thermomechanical treatment parameters: deformation temperature, strain and elapsed time followed by the end of deformation up to the start of accelerated cooling. It was found that mechanical properties changes correspond to recrystallization changes. Mathematical models and nomographs of recrystallization fraction and yield strength dependences from above mentioned parameters were obtained. The study results demonstrate the possibilities to use such type of recrystallization diagrams and the finite element method modeling simulation to predict structure and mechanical properties for different cross-sections of rolled billets and parts. 10.18149/MPM.5432026_13 hot rolling simulation mechanical properties high temperature thermomechanical treatment recrystallization finite element method https://mpm.spbstu.ru/article/2026.114.13/ 13_kodzhaspirov_et_al.pdf