Materials physics and mechanics

RAR RUS 1-7 Ioffe Institute Rul' N.I.

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Romanov V.V.

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

Peter the Great St. Petersburg Polytechnic University Gasumyants Vitaliy

St. Petersburg, Russia

Field dependences of the magnetization of the hybrid SiC/Si structure grown by the vacancy method of coordinated substitution of atoms The measurement data and a general approach to the analysis of the field dependencies of magnetization of the hybrid SiC/Si structure grown by the vacancy method of coordinated substitution of atoms (VMCSA) are presented. The experimental results can be interpreted as a set of additive contributions to the magnetization of the sample. The analysis of the field dependences of magnetization allowed us to identify a presence of paramagnetic impurities in the sample under study and an inclusion that demonstrates characteristic features of ferromagnetic ordering. It is shown than the value of the specific diamagnetic mass susceptibility of the main SiC/Si substance determined from 10.18149/MPM.5262024_1 silicon carbide VMCSA hybrid structure SQUID external magnetic field magnetization diamagnetism impurity ferromagnetism https://mpm.spbstu.ru/article/2024.105.1/ 1-Rul%2C-Romanov.pdf

RAR RUS 8-16 0000-0003-0727-6352 Institute of Problems of Mechanical Engineering RAS Gutkin M. Yu.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Krasnitckii S.A.

St.Petersburg, Russia

7003559440 0000-0003-2192-0386 Institute for Problems of Mechanical Engineering RAS Skiba Nikolai nikolay.skiba@gmail.com

St. Petersburg, Russia

Formation of liquid-like inclusions near pores in amorphous intercrystalline layers in high-temperature ceramics A theoretical model is suggested that describes a mechanism of plastic deformation in high-temperature ceramic materials containing amorphous intercrystalline layers (AILs) and pores in triple junctions of AILs. Within the model, the plastic deformation is realized through the generation of liquid-like inclusions on pore surfaces and their subsequent propagation along the AILs. In the exemplary case of high-temperature α-Al2O3 ceramics with AILs, the dependences of the critical values of the external shear stress for the formation of a liquid-like inclusion on deformation temperature in a wide range of the deformation temperatures from 300 to 1500 K are calculated. It is shown that the critical stress for the nucleation of a liquid-like inclusion strongly depends on the deformation temperature and weakly depends on the pore size. 10.18149/MPM.5262024_2 high-temperature ceramics amorphous intercrystalline layers liquid-liked inclusions pores deformation temperature https://mpm.spbstu.ru/article/2024.105.2/ 2-Gutkin.pdf

RAR RUS 17-26 Herzen State Pedagogical University of Russia Pronin

St.Petersburg, Russia

Herzen State Pedagogical University of Russia Ryzhov

St. Petersburg, Russia

Ioffe Institute Senkevich S.V.

St.Petersburg, Russia

National Research Centre "Kurchatov Institute" -Central Research Institute of Structural Materials "Prometey" Staritsyn M.V.

St. Petersburg, Russia

Ioffe Institute Kaptelov E.Yu.

St.Petersburg, Russia

Ioffe Institute Pronin I.P.

St.Petersburg, Russia

An influence of mechanical stresses on the phase state of spherulitic thin films of lead zirconate titanate The influence of lateral mechanical stresses on the crystal structure, microstructure and dielectric properties of spherulitic thin films of lead zirconate titanate is studied. The composition of lead zirconate titanate corresponded to the region of the morphotropic phase boundary. In thin films, the perovskite phase was formed during high-temperature annealing of amorphous films deposited by RF magnetron sputtering of a ceramic target on a cold silicon substrate. The deformation of the crystal lattice caused by the change in density during crystallization of the perovskite phase in the films changed with an increase in the area of spherulitic blocks with a variation in the target-substrate distance during their deposition. An increase in mechanical stress led to a linear rotation of the crystal lattice and a change in its parameters, as well as to a change in the microstructure of thin films. Based on the temperature dependences of the reverse dielectric permittivity, changes in the temperature of structural phase transitions in the films were revealed. 10.18149/MPM.5262024_3 lead zirconate titanate thin films morphotropic phase boundary spherulitic microstructure mechanical stresses https://mpm.spbstu.ru/article/2024.105.3/ 3-Pronin.pdf

RAR RUS 27-37 Maharishi Markandeshwar (Deemed to be University) Sachdeva

Mullana-Ambala, Haryana, India

Maharishi Markandeshwar University Choudhary

Mullana, India

Photoluminescent characteristics of solution-processed nanoscale copper oxide In the present work, pure CuO nanoparticles were synthesized using the co-precipitation method, and their properties such as structural, morphological, and optical were elucidated. The obtained X-ray diffraction (XRD) patterns confirm that the synthesized CuO powders crystalize to a monoclinic phase. In addition to that, the appearance of the broad XRD peaks reflects the confinement of the particle size to nonorange. The average particle size of the synthesized CuO nanoparticles measured using field emission scanning electron microscopy (FESEM) image is 36.8 nm. Due to the size confinement to the nanoscale, the synthesized CuO nanoparticles showed a high optical band gap of 2.84 eV. Further, the emission properties of CuO measured using photoluminescence (PL) spectroscopy at an excitation wavelength of 300 nm reflects that most of the emission lies in the ultraviolet (UV) range. However, upon close investigation of the emission spectra, the peak corresponding to the blue emission was also observed. The appearance of this blue emission was the consequence of the various defects present in CuO such as oxygen vacancies and copper interstitials. The Commission Internationale de I'Eclairage (CIE) color coordinates for the blue color emitted by CuO nanoparticles is (0.15, 0.13), which lies close to the ideal blue color. Further, the synthesized CuO nanoparticles showed a high color purity of 84.71 % for blue color. 10.18149/MPM.5262024_4 CuO nanoparticles absorption emission defects https://mpm.spbstu.ru/article/2024.105.4/ 4-Sachdeva-S%2C-Choudhary-I.pdf

RAR RUS 38-60 Peter the Great St. Petersburg Polytechnic University Borovkov A.I.

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Maslov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Zhmaylo

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Tarasenko

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Nezhinskaya

St. Petersburg, Russia

Finite element analysis for prediction of femoral component strength in hip joint endoprosthesis made from meta-biomaterial A theoretical study on the structural strength of an endoprosthesis stem made from meta-biomaterial is presented. We considered six types of metamaterials based on a biocompatible titanium alloy comprised by unit cells of lattice and surface structures. The standard for testing femoral components of endoprostheses was used to develop virtual test benches for simulation of the loading process, followed by stress–strain analysis of meta-biomaterial implants. Our general findings confirm the load-bearing capacity of the structures, additionally pointing to potential issues that may arise if the manufacturing technology of metamaterial endoprostheses is insufficiently rigorous. 10.18149/MPM.5262024_5 meta-biomaterial lattice structures surface structures hip joint endoprosthesis finite element analysis strength https://mpm.spbstu.ru/article/2024.105.5/ 5-Borovkov.pdf

RAR RUS 61-80 Peter the Great St. Petersburg Polytechnic University Pulin

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Laptev

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Alisov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Barskov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Rassokhin

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Gong

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Kotov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Roshchenko

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Balakin

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Golubtsov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Nurkov

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Basati Panah

St. Petersburg, Russia

Heat exchanger and the influence of lattice structures on its strength The heat exchanger is the main heat engineering equipment in various industries. The design of modern heat exchangers implies the presence of various turbulators. The purpose of turbulators is to increase the efficiency of heat exchange processes. Research of turbulators is limited to finding the optimal ratio between heat exchange parameters and hydraulic resistance of the system, without touching upon the issues of changing the strength characteristics of heat exchangers. Within the framework of this article, an analysis of a section of a tubular heat exchanger with a flow turbulator in the form of a lattice structure is carried out. Within the framework of this article, the method of comparative numerical modeling was chosen, consisting in the study of the stress-strain state and frequency response of the objects of study in the original and modernized formulations, under the action of thermal and gas-dynamic loads, modeled in heat-conjugate and mechanical analysis. The result of this study is the results of numerical modeling, reflecting the general change in the stress-strain state and frequency response of the heat exchanger. The analysis showed that the use of lattice structures reduces the average equivalent stresses in the heat exchanger by 10–20 % depending on the flow mode. In addition, frequency analysis showed a significant increase in the natural frequencies of the modified heat exchanger in the range from 86 % to 125 %. These results show that the use of flow turbulators allows increasing not only the efficiency of heat exchange processes, but also its strength. 10.18149/MPM.5262024_6 mechanics numerical investigation structural analysis modal analysis physics of strength additive technologies heat exchangers https://mpm.spbstu.ru/article/2024.105.6/ 6-Pulin.pdf

RAR RUS 81-90 Institute for Problems of Mechanical Engineering RAS Belyaev F.S.

St. Petersburg, Russia

St. Petersburg State University Volkov A.E.

St. Petersburg, Russia

St. Petersburg State University Gorbachenko

St. Petersburg, Russia

St. Petersburg State University Evard M.E.

St. Petersburg, Russia

Modeling of working cycles of thermomechanical actuators based on shape memory alloys at repeated actuation The microstructural model of the mechanical behavior of shape memory alloys was applied to describe the operation of a thermomechanical torsion actuator with a TiNi alloy working body and an elastic counterbody. The calculated dependences of а recovery strain, maximum stress in a cycle, and irreversible deformation on the cycle number were plotted for the working body of the actuator. It is shown that from cycle to cycle there is an accumulation of irreversible deformation, the rate of which gradually decreases. As a consequence, both the value of а recovery strainand the value of the stresses developed by the actuator decrease, which together leads to a decrease in the work output. The influence of the stiffness of the elastic counterbody on the specific work produced in the cycle was investigated. It is shown that the produced work depends non-monotonically on the stiffness of the counterbody and there is an optimal stiffness at which this work is maximized. 10.18149/MPM.5262024_7 shape memory alloys actuator microstructural modeling plastic deformation TiNi https://mpm.spbstu.ru/article/2024.105.7/ 7-Belyaev.pdf

RAR RUS 91-100 Motilal Nehru National Institute of Technology Allahabad Kumar

India

Motilal Nehru National Institute of Technology Allahabad Bharti

India

Sanjivani College of Engineering Rony

Kopargaon, India

Sanjivani College of Engineering Kapgate

Kopargaon, India

Effect of Ti reinforcement on the thermal behaviour of AZ91/Ti composites Despite magnesium's high strength-to-weight ratio and eco-friendly nature, its limited industrial applications due to low corrosion and wear resistance have prompted extensive research into enhancing these properties. Magnesium matrix composites have been developed with various reinforcements, including B4C, SiC, carbon nanotubes, graphite, and titanium (Ti). Among these, Ti is particularly promising as it improves wear resistance while preserving mechanical strength and ductility. In this study, the influence of Ti volume fraction on the thermal properties of AZ91/Ti composites fabricated via powder metallurgy is explored. Results revealed a reduction in thermal conductivity up to 6 % Ti content (6 W/m‧K), attributed to Ti's lower thermal conductivity compared to magnesium. However, the Mg + 8% Ti composite exhibited enhanced thermal conductivity (10.51 W/m‧K), but mechanical properties degraded. After analysis of physical, mechanical, and thermal tests, it is concluded that 6 % Ti volume fraction is the optimum choice for balancing mechanical performance in Mg/Ti composites. This research contributes valuable insights for tailoring Mg/Ti composites to specific engineering needs, offering a potential solution to the challenge of wear resistance in magnesium-based materials. 10.18149/MPM.5262024_8 AZ91 Mg alloy powder metallurgy titanium composites thermal conductivity thermal diffusivity https://mpm.spbstu.ru/article/2024.105.8/ 8-Naveen-Kumar.pdf

RAR RUS 101-113 Visvesvaraya Technological University Gangadharappa

Belagavi, Karnataka, India

KR Pet Krishna Government Engineering College Geetha

KR Pet, Karnataka, India

BMS College of Engineering Manjunath

Bengaluru, Karnataka, India

Bangalore Institute of Technology Umesh

Bengaluru, Karnataka, India

BMS College of Engineering Shivakumar

Bengaluru, Karnataka, India

Study on n-TiB2 particulates reinforced Al7075 nano composite for soil nail applications: mechanical, wear, and fracture characterizations Stir casting was used to produce Al7075/n-TiB2 composites with three distinct n-TiB2 weight percentages: 1, 1.5, 2 and 2.5 %. The mechanical and tribological characteristics of Al7075/n-TiB2 composites have been investigated in dry sliding situations. Evenly distributed dispersion of n-TiB2 particulates and the strong interfacial interaction among the matrix as well as reinforcement are confirmed by the microstructural characterization. Composites with 1, 1.5, 2 and 2.5 % reinforced n-TiB2 show the better mechanical properties when compared to base alloy. Fracture research revealed that n-TiB2 reinforced aluminum matrix composites and non-reinforced aluminum alloy exhibited ductile expression in the form of dimples. Dry sliding wear assessments have been performed using pin-on-disc instruments. We measured the wear loss of the nano composites and found that the cumulative wear loss variation with n-TiB2 is linear for each composite. According to the SEM examination of worn-out surfaces, oxidative wear is responsible for specimens that fall within the prescribed stress and sliding distance. The experiment demonstrates that wear loss decreases linearly with an increase in the weight percentage of titanium diboride nanoparticles. The obtained results show that the fabricated nano composites exhibit improved hardness of 14 %, tensile strength of 9 % and wear resistance of 20 % when compared to the base alloy. 10.18149/MPM.5262024_9 Al7075 n-TiB2 microstructure mechanical properties wear behavior fracture surface https://mpm.spbstu.ru/article/2024.105.9/ 9-Gangadharappa-et-al.pdf

RAR RUS 114-125 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

Effect of rotational speed on various performance measures in friction stir lap weld of aluminium alloy 6061 using numerical simulation approach The quality of a friction stir weld is significantly influenced by the choice of appropriate weld parameters, with rotational speed being one of the key factors. This study aims to examine these elements' influence on physical characteristics of velocity, viscosity, and torque. The performance measures being evaluated include the assessment of maximum weld interface velocity, minimum weld interface viscosity and tool-workpiece interface torque. This study utilises a computational fluid dynamics model to examine the influence of various rotational speeds on the aforementioned performance indicators. The workpiece selected for this study is an Aluminium Alloy 6061, while the tool employed is a truncated conical pin tool featuring a conical shoulder in a lap joint configuration. The study reveals that with an increase in rotational speed from 500 to 2900RPM, maximum weld interface velocity exhibits an increase with decreasing slope. As the rotational speed increases, the minimum weld interface viscosity decreases with decreasing slope. It is also found that tool-workpiece interface torque decreases with approximately constant slope with increasing rotational speed (500 to 2900RPM), meaning a linear decreasing trend. The findings of this investigation are validated through a comparative analysis with previously published data. With this information and the resulting conclusions, friction stir welders can deepen their understanding of how rotational speed affects welding quality. 10.18149/MPM.5262024_10 friction stir welding computational fluid dynamics fluent finite volume method https://mpm.spbstu.ru/article/2024.105.10/ 10-Amit-Yadav.pdf

REV RUS 126-135 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 from the mathematical standpoint The types of classification for fullerenes’ property are considered. It accumulates empirically found the horizontal and vertical symmetry of fullerenes which give a preliminary classification. Two different symmetries are united into a common symmetry producing the periodic system of fullerenes. This system may be considered as the topological lattice in the topological space of the points corresponding to the fullerenes. The system gives the general classification of fullerenes on the basis of symmetry. 10.18149/MPM.5262024_11 carbon fullerene graph growth isomer periodic system topology https://mpm.spbstu.ru/article/2024.105.11/ 11-Melker.pdf

REV RUS 136-153 0000-0001-7563-5623 National Institute of Technology Kurukshetra Agarwal

Haryana, India

0000-0002-5648-6113 National Institute of Technology Kurukshetra Singh

Haryana, India

Production techniques and properties of particulate reinforce metal matrix composites: a review The production techniques intended for synthesizing the metal matrix composites (MMCs) with particle-sized reinforcements are summarized and also the influence of reinforcement particles on various properties of MMCs is discussed. Stir casting is one of the largely used production practice for such MMCs as it is economical but there is some compromise with quality of composite due to agglomeration of reinforcement particles within the matrix phase. Such problem does not occur when MMCs are fabricated using ultrasonic stir casting process, squeeze casting and powder metallurgy technique. Tensile strength and hardness of MMCs were improved by 9 to 110 % and by 5 to 120 %, respectively, by adding reinforcement (0.5% to 30%). Wear rate and corrosion rate were decreased from 5.5 to 3.7 mm3/km and 0.0396 to 0.0178 mm/yr, respectively. But some properties like ductility, % elongation, toughness and impact strength of the composite are compromised due to the brittle nature of the reinforcement. 10.18149/MPM.5262024_12 metal matrix composites reinforcements mechanical properties stir casting powder metallurgy https://mpm.spbstu.ru/article/2024.105.12/ 12-Agarwal(2).pdf

REV RUS 154-170 Maharishi Markandeshwar University Kumar P.

Mullana-Ambala, India

National Institute of Technology Kurukshetra Kumar

Haryana, India

Dev Polytechnic College Kaur

Ambala, India

Medi-Caps University Chalisgaonkar

Indore, India

Poornima University Singh

Jaipur, India

Investigation of aluminum metal matrix composite fabrication processes: a comparative review Aluminum alloys are widely used in industry because of their superior mechanical qualities and high specific strength-to-weight ratio. Al-matrix composites (AMC) may identify the newly synthesized material because it has the mechanical properties of pure aluminum alloys with reinforcement from a variety of ceramics. Matrix materials have included aluminum alloys, with ceramic reinforcements including aluminum oxide (Al2O3), magnesium oxide (MnO), graphene nanoplatelets (GNPs), boron carbide (B4C), silicon carbide (SiC), graphite (Gr), fly ash (FA), etc. The best, most practical, and most cost-effective way to create the composites is by the stir casting process. The review focuses on the two-step stir-casting process for AMCs production. Reinforcement pre-heating temperature, injection rate, porosity, wettability, stirrer structure, stirring time and speed, purge, pouring temperature, solidification rate, and mold temperature are examined to optimize the casting process. Optimal conditions include preheating particles at 200–500°C for 30–60 min, maintaining a feeding rate of 8–10 mg/min, stirring speeds of 700–800 rpm for 10–40 min, and using a 30-degree to 60-degree impeller-blade angle. Emerging trends suggest enhancements such as microwave heating, ultrasonic probe usage, inert environment incorporation, and electromagnetic stir casting for improved wettability and uniformity. 10.18149/MPM.5262024_13 aluminum alloys composites reinforcements ceramics stir-casting https://mpm.spbstu.ru/article/2024.105.13/ 13-PKumar-2025.pdf