Materials physics and mechanics

RAR RUS 1-10 Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences Malikov

Novosibirsk, Russia

Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences Orishich

Novosibirsk, Russia

Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences Karpov

Novosibirsk, Russia

Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences Vitoshkin

Novosibirsk, Russia

Control of the mechanical properties and microstructure of laser welded joints of the aluminum alloy V-1461 after heat treatment The paper presents the investigations of the influence of the thermal postprocessing on the mechanical characteristics and microstructure of the welded aluminum alloy V-1461 of the system Al-Cu-Li. The temperature and time characteristics of the quenching and artificial ageing processes of the laser welded connections have been optimized in order to have the ultimate tensile stress, yield stress, and relative elongation, as well as the microstructures close to the respective characteristics of the basic alloy. At the optimal modes of the thermal processing, the tensile stress, yield stress and relative elongation of welded samples are 0.92; 0.91 and 0.88, respectively, in respect to the basic alloy values. 10.18720/MPM.4312020_1 laser welding Al-Cu-Li alloy; strength; heat treatment microstructure https://mpm.spbstu.ru/article/2020.74.1/ MPM143_01_malikov.pdf

RAR RUS 11-17 Yu.A. Kosygin Institute of Tectonics and Geophysics, Far Eastern branch of the Russian Academy of Sciences Shtarev

Khabarovsk, Russian Federation

Far Eastern State Transport University Nashchochin

Khabarovsk, Russian Federation

Far Eastern State Transport University Syuy

Khabarovsk, Russian Federation

Far Eastern State Transport University Shtareva

Khabarovsk, Russian Federation

Temperature evolution of the diffuse reflectance spectra of Sr3Bi2O6 strontium bismuthate The diffuse reflection spectroscopy (DRS) method was used to study the properties of strontium bismuthate Sr3Bi2O6 in a wide temperature range. It is established that after the Kubelka-Munk transformation and logarithmization, it is possible to distinguish three linear sections on the DRS. The presence of such linear regions at energies smaller than the bandgap is usually associated with electron-phonon interactions in the crystal and is described using a model based on the Urbach rule. A high-energy linear region can be associated with a direct transition of electrons from the valence band to the conduction band. The remaining linear sections can be associated with the transfer into the conduction band of electrons biographically localized in deep traps in the bandgap. 10.18720/MPM.4312020_2 strontium bismuthate temperature dependence of diffuse reflection spectra Urbach rule Urbach energy electron-phonon interactions https://mpm.spbstu.ru/article/2020.74.2/ MPM143_02_shtarev.pdf

RAR RUS 18-29 Togliatti State University Vikarchuk

Togliatti, Russia

Togliatti State University Gryzunova

Togliatti, Russia

Belgorod State University Manokhin

Belgorod, Russia

Disclination models of transformation of icosaedric copper particles during their growth during electric crystallization For the first time, copper particles in the form of truncated micron-sized icosahedrons were experimentally obtained by electrodeposition, their morphology and internal structure were investigated. It is shown that fullerene-like copper microparticles grow from non-crystalline spherical nanoparticles and are transformed during electrocrystallization into perfect icosahedrons, which have a more stable shape and structure. The disclination models for the conversion of nanoparticles into icosahedral microparticles are developed and described. 10.18720/MPM.4312020_3 icosahedral copper particles fullerene-like copper microparticles disclination models of icosahedral microparticles https://mpm.spbstu.ru/article/2020.74.3/ MPM143_03_vikarchuk.pdf

RAR RUS 30-43 A.A. Baikov Institute of Metallurgy and Materials Science, RAS Politova

Moscow, Russia

A.A. Baikov Institute of Metallurgy and Materials Science, RAS Mikhailva

Moscow, Russia

A.A. Baikov Institute of Metallurgy and Materials Science, RAS Ganin

Moscow, Russia

A.A. Baikov Institute of Metallurgy and Materials Science, RAS Burkhanov

Moscow, Russia

Structure and magnetic properties substituted (Tb,R)Fe2 (R = Sm, Ce) Laves phases The rare earth SmFe2 and CeFe2 Laves phases and solutions on base of them with partial substitution by terbium ((Sm,Tb)Fe2, (Ce,Tb)Fe2) were obtained. The lattice parameters of compounds were refined by Rietveld method. To study the effect of substitution on the magnitudes of magnetostriction and magnetization of alloys, measurements in the temperature range 78-360 K in magnetic fields up to 1.2 T were carried out. Using Belov-Arrot method, the Curie temperatures for series of compounds in Ce1-xTbxFe2 (x = 0; 0.1 and 0.2) system were determined. It was found that in the Sm1-xTbxFe2 system, a change in the sign of magnetostriction should be observed at x = 0.4 - 0.45, which correlates well with X-ray diffraction data. 10.18720/MPM.4312020_4 rare-earth intermetallic compounds Laves phases magnetostriction magnetization phase transition CeFe2 SmFe2 https://mpm.spbstu.ru/article/2020.74.4/ MPM143_04_politova.pdf

RAR RUS 44-49 Ufa State Aviation Technical University Zhilyaev Alexandr P.

Ufa, Russia

Ufa State Aviation Technical University Raab

Ufa, Russia

Research Institute of Advanced Materials Physics at USATU Kodirov

Ufa, Russia

Ufa State Aviation Technical University Raab

Ufa, Russia

Analysis of the degree isotropic deformation, strength and structure steel samples after severe deformation by shifting The article presents the results of computer simulation and physical research of severe deformation by free torsion of long-length specimens with a round cross-section of steel 10 at a temperature of 600°C. Based on virtual approaches in the Deform 3D software package, the deformed state of the samples, including the distribution of accumulated strain in the bulk workpiece, was investigated. A physical experiment was carried out, the structure and microhardness in the longitudinal section of the samples were studied. The principles of the mutual influence of the degree of anisotropy of the deformed state on the formation of the structure and mechanical properties are established. The anisotropic (gradient) nature of the formation of the structure and mechanical properties in bulk samples using the free torsion method and the accumulation of super high, up to e~6, large shear strains in the precrystallization temperature range of plastic processing is established. 10.18720/MPM.4312020_5 a degree of isotropy (gradient) structure and mechanical properties free torsion severe plastic deformation computer simulation https://mpm.spbstu.ru/article/2020.74.5/ MPM143_05_zhilyaev.pdf

RAR RUS 50-58 Peter the Great St. Petersburg Polytechnic University Kitaeva D.A.

St.Petersburg, Russia

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

VŠB – Technical University of Ostrava Kliber

Ostrava – Poruba, Czech. Republic

University of Patras Apostolopoulos

Greece

Physical fundamentals of thermomechanical processing in ultrafine-grained metallic materials manufacturing The processing of metallic materials through the application Thermomechanical Processing (TMP) has now become of major importance in the world research and industrial companies. A great attention is paid to study of mechanism TMP applied to different techniques and technological processes providing ultrafine-grained state of metal materials including submicro – and nanocrystalline ones. The main development in terms of obtaining bulk metallic materials received in the recent years, various schemes of TMP of metallic materials, which allows to realize the severe plastic deformation (SPD). The approach usually propose realization of large plastic strains, providing a well-developed fragmented substructure with the creation of high-angle misorientation between the fragments of the substructure. This paper discusses the physical fundamentals and various methods of thermomechanical processing, applied to single and multiphase steels and alloys ensuring the produce ultrafine-grained (UFG) metallic materials. 10.18720/MPM.4312020_6 ultrafine-grained (UFG) metallic materials severe plastic deformation (SPD) large plastic strain thermomechanical processing (TMP) fragmented substructure https://mpm.spbstu.ru/article/2020.74.6/ MPM143_06_rudskoi.pdf

RAR RUS 59-64 University of Ioannina Apostolopoulos

Ioannina, Greece

University of Patras Apostolopoulos

Greece

University of Patras Drakakaki

Patrac, Greece

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

Corrosion resistance and mechanical performance of steel reinforcement, before and after shot-blasting process As it is widely known, corrosion of steel reinforcement is one of the main causes of deterioration of the reinforced concrete structures. Corrosion phenomena combined with seismic loads aggravate the situation. For this reason, in the present paper, an effort is made to upgrade the performance of steel reinforcement against corrosion, using the shot blasting method. Precisely, two groups of specimens were prepared, one of which had previously been shot blasted. Afterwards, the specimens were undergone artificial corrosion, in order to compare the results of the developed corrosion damage. Some of them were inserted in a salt spray chamber and the rest of them were corroded via "impressed current density corrosion" technique. Finally, mechanical tests were executed, in order to make an assessment concerning the performance of the reference and the shot blasted material, before and after corrosion effect. Both selection of the double shot blasting process and experimental results that came out, were really encouraging. 10.18720/MPM.4312020_7 corrosion resistance shot blasting mechanical performance https://mpm.spbstu.ru/article/2020.74.7/ MPM143_07_apostolopoulos.pdf

RAR RUS 65-71 Peter the Great St. Petersburg Polytechnic University Polozov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Borisov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Sufiiarov

St.Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Popovich

St.Petersburg, Russia

Selective laser melting of copper alloy Additive Manufacturing (AM) of copper and its alloys is a promising way to produce parts with complex geometries without tooling. One of the AM processes is Selective Laser Melting (SLM) technology that uses a laser beam to fuse powder layers to obtain a final part. Laser processing of copper is considered to be a challenging task due to its high thermal conductivity and poor laser absorptivity. In the present work, Cu-Cr-Zr-Ti alloy powder has been utilized in the SLM process to produce bulk samples. SLM process parameters (laser power, scanning speed, hatch distance) have been optimized to achieve almost fully-dense samples with a relative density of about 99.2% and a smooth surface. The obtained bulk samples were used to evaluate the microstructure of the as processes Cu-Cr-Zr-Ti alloy, which consisted of elongated grains with the size of 30–250 µm. A test part built using the optimized SLM parameters was 3D-scanned to evaluate the dimension accuracy, which resulted in the average deviation of +88 μm / -81 μm from the CAD-model. 10.18720/MPM.4312020_8 Selective Laser Melting Copper Alloy Powder Metallurgy https://mpm.spbstu.ru/article/2020.74.8/ MPM143_08_polozov.pdf

RAR RUS 72-83 Orel State University Gribanov

Orel, Russian Federation

Orel State University Markov

Orel, Russian Federation

Orel State University Khripunov

Orel, Russian Federation

Quantum chemical modeling bismuth-based clusters The article presents the results of calculations of the structure and energy parameters of BiN : Bi8 , Bi18 , Bi50 , Bi98 , Bi162 bismuth nanoclusters using quantum chemical methods. An extrapolation estimate of the number of atoms in a cluster with a zero band gap is made. The band gap width of bismuth nanoclusters passivated by Bi HmN hydrogen is calculated . The results of quantum chemical modeling of Bi Sb ( ) N n n  bismuthantimony clusters are presented. 10.18720/MPM.4312020_9 cluster bismuth a transition semiconductor-semimetal bismuth-antimony quantum-chemical simulation band gap width https://mpm.spbstu.ru/article/2020.74.9/ MPM143_09_gribanov.pdf