https://www.elibrary.ru/title_about_new.asp?i
1605-8119
Materials physics and mechanics
24
3
2015
1-107
RAR
RUS
201-210
Institute Metal Physics, Ural Branch of RAS
Gornostyrev
Yekaterinburg, Russia
Institute Metal Physics, Ural Branch of RAS
Korzhavyi
Yekaterinburg, Russia
Institute Metal Physics, Ural Branch of RAS
Karkin
Yekaterinburg, Russia
Institute of Metal Physics, Ural Branch of RAS
Karkina
Ekaterinburg, Russia
Institute Metal Physics, Ural Branch of RAS
Kuznetsov
Yekaterinburg, Russia
Institute Metal Physics, Ural Branch of RAS
Petrik
Yekaterinburg, Russia
Segregation of Mg to generic tilt grain boundaries in Al: Monte Carlo modeling
The formation of equilibrium segregations at tilt grain boundaries of several different types in Al-Mg alloys has been investigated in the framework of a combined approach, which includes molecular dynamics simulation and thermodynamic Monte Carlo modeling. The concentration profile of Mg distribution in GB vicinity was calculated in dependence on the alloy concentration and temperature. We found that width of segregation on generic GB determined by feature of their structure and is match bigger in comparison with special low-energy GB. It is shown that segregation formation is control not only energy gain due to moving solute on GB but also interaction between solute atoms; as results, maximal enrichment of GB is not exceed 25 at.%. Possible origins of the formation of extended segregation on GB in materials subjected by severe plastic deformation have been discussed.
Al-Mg alloys; tilt grain boundaries; segregation of Mg; Monte Carlo modeling
https://mpm.spbstu.ru/article/2015.43.1/
MPM324_01_gornostyrev.pdf
RAR
RUS
211-217
Changzhou University
Wei
China
Changzhou University
Wei
China
Ufa State Aviation Technical University
Musin
Ufa, Russia
Ufa State Aviation Technical University
Alexandrov
Ufa, Russia
Ufa State Aviation Technical University
Sarkeeva
Ufa, Russia
Ufa State Aviation Technical University
Abramova
Ufa, Russia
Ufa State Aviation Technical University
Oreshkina
Ufa, Russia
Ufa State Aviation Technical University
Sitdikov
Ufa, Russia
Elevated tribological characteristics of ultrafine grained conductive Cu-0.5Cr-0.2Zr alloy
For the first time, the possibility of radical reduction of the friction coefficient from 0.7 up to 0.3 with an increase in the strength from 950 MPa up to 1600 MPa was demonstrated for electrical Cu-0.5Cr-0.2Zr alloy as a result of the ultrafine-grain structure formation by equal channel angular pressing.
electrical Cu-0.5Cr-0.2Zr alloy; ultrafine-grain structure; tribological characteristics.
https://mpm.spbstu.ru/article/2015.43.2/
MPM324_02_sarkeeva.pdf
RAR
RUS
218-223
Federal budget - funded research Institute of Machines Science named after A.A. Blagonravov RAS
Stolyarov
Moscow, Russia
Influence of structure refinement on electroplastic effect in shape memory TiNi alloys
The influence of structure-phase features and electric current modes on the electroplastic effect (EPE) revealed at tension for coarse-grained, nanocrystalline and amorphous TiNi-based alloys is investigated. Grain-size refinement up to nanoscale and amorphization in alloys lead to decreases or even full disappearance of EPE. In nanocrystalline alloys with reverse thermoelastic martensite transformation, the introduction of current pulses suppresses downwards stress jumps induced by the EPE and causes active upwards stress jumps connected with the shape memory effect (SME).
electroplastic effect; shape memory effect; pulse current; nanostructure; amorphous alloys
https://mpm.spbstu.ru/article/2015.43.3/
MPM324_03_stolyarov.pdf
RAR
RUS
224-231
Belgorod State University
Belyakov
Belgorod, Russia
Belgorod State University
Zherebtsov
Belgorod, Russia
Belgorod State University
Tikhonova
Belgorod, Russia
Belgorod State University
Salishchev
Belgorod, Russia
Kinetics of grain refinement in metallic materials during large strain deformation
The development of ultrafine grained microstructures in austenitic stainless steel and pure titanium subjected to large strain deformation was comparatively studied. The change in the volume fractions of newly developed ultrafine grains was used to quantify the progress in grain refinement during plastic deformation. The grain refinement kinetics could be expressed by a modified Johnson-Mehl-Avrami-Kolmogorov equation as a function of true strain. The grain refinement kinetics was suggested being sensitively depended on the deformation conditions and the deformation mechanisms operating during severe plastic working. Under conditions of warm working, an increase in the deformation temperature accelerated dynamic recovery and, therefore, promoted the new grain development. Under conditions of cold working, the grain subdivision in austenitic stainless steel and titanium during cold working was assisted by the deformation twinning. However, the kinetics of grain refinement in austenitic stainless steel was faster as compared to pure titanium owing to strain-induced martensitic transformation.
austenitic stainless steel; titanium; ultrafine grained microstructure; grain refinement kinetics; modified Johnson-Mehl-Avrami-Kolmogorov equation
https://mpm.spbstu.ru/article/2015.43.4/
MPM324_04_zherebtsov.pdf
RAR
RUS
232-238
Ufa State Aviation Technical University
Khafizova
Ufa, Russia
Ufa State Aviation Technical University
Islamgaliev
Ufa, Russia
Togliatti State University
Klevtsov
Togliatti, Russia
Togliatti State University
Merson
Togliatti, Russia
Microstructure, strength and fatigue of an ultrafine-grained Al-Cu-Mg alloy
The impact of equal-channel angular pressing (ECAP) on the microstructure of an Al-Cu-Mg alloy has been investigated using transmissio electron microscopy and electron backscatter diffraction. A combination of an ultrafine-grained and bimodal structure was observed in the alloy as a result of ECAP processing. The ECAP-processed samples after tensile tests and cyclic loads have demonstrated an enhanced ultimate tensile strength and fatigue endurance limit in comparison with the properties of the samples subjected to the standard T6 treatment.
ultrafine-grained Al-Cu-Mg alloy; microstructure; strength; fatigue
https://mpm.spbstu.ru/article/2015.43.5/
MPM324_05_khafizova.pdf
RAR
RUS
242-252
Frantsevich Institute for Problems in Materials Science NASU
Danylenko
Kiev, Ukraine
Ufa State Petroleum Technical University
Tsenev
Ufa, Russia
Ufa State Aviation Technical University
Bakhtizin
Ufa, Russia
Ufa State Aviation Technical University
Aleshin
Ufa, Russia
Ufa State Aviation Technical University
Raab
Ufa, Russia
Ufa State Aviation Technical University
Raab
Ufa, Russia
Ufa State Aviation Technical University
Gunderov
Ufa, Russia
0000-0002-7947-801X
Kazan Federal University
Shafigullin
Kazan, Russia
Frantsevich Institute for Problems in Materials Science NASU
Podrezov
Kiev, Ukraine
Structural variations in low-carbon steel under severe plastic deformation by drawing, free torsion, and drawing with shear
This paper presents the findings of the numerical simulation of conventional drawing, free torsion and drawing with shear, as well as the structural studies of deformed billets fabricated of low-carbon steel. The non-uniform severe deformation distribution observed in the model corresponds principally to actual physical experiments with similar parameters of structural inhomogeneity. It has been found that the diffusion processes of dissolution of the initial dispersed cementite particles and formation of new ones become essentially more active. The microhardness of Steel 10 rod surface layer therewith increases up to ~ 7000 MPa.
low-carbon steel; severe plastic deformation; drawing; free torsion; drawing with shear; numerical simulation
https://mpm.spbstu.ru/article/2015.43.6/
MPM324_06_raab.pdf
RAR
RUS
253-258
0000-0003-1619-309X
Peter the Great St. Petersburg Polytechnic University
Rybin
St.Petersburg, Russia
0000-0003-3094-8559
Central Research Institute of Structural Materials “Prometey”
Ushanova
St.Petersburg, Russia
0000-0002-0185-5452
Peter the Great St. Petersburg Polytechnic University
Zolotorevsky
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Ermakova
St.Petersburg, Russia
Study of copper work-hardening behavior on a single sample experienced inhomogeneous dynamic deformation
The microhardness variation as a function of strain has been evaluated on the base of the EBSD characterization of copper sample subjected to strongly inhomogeneous dynamic deformation. In order to fulfill the evaluation, the microhardness measurements as well as the microstructure analysis were performed at several locations along the direction of the strain gradient. The local strains have been determined based on the distribution of misorientations at deformation-induced boundaries. Mechanical twinning was shown to give significant contribution to the work-hardening under condition of dynamic deformation.
copper; inhomogeneous dynamic deformation; work-hardening behavior
https://mpm.spbstu.ru/article/2015.43.7/
MPM324_07_rybin.pdf
RAR
RUS
259-265
0000-0002-0185-5452
Peter the Great St. Petersburg Polytechnic University
Zolotorevsky
St.Petersburg, Russia
0000-0003-1619-309X
Peter the Great St. Petersburg Polytechnic University
Rybin
St.Petersburg, Russia
0000-0003-3094-8559
Central Research Institute of Structural Materials “Prometey”
Ushanova
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Ermakova
St.Petersburg, Russia
Microstructure formation during inhomogeneous dynamic deformation produced by steel plates bonding
With the electron backscattered diffraction (EBSD) technique the non-uniform microstructure forming under conditions of inhomogeneous dynamic deformation were investigated by the example of explosively bonded steel plates. The layers with fine-grained recrystallized structure as well as deformation-induced fragmented structure are distinguished within the narrow interface zone undergone intense deformation. The study was focused on the mechanism of the fragmented structure formation. Within the layers subjected to mediate deformation, the deformation-induced branching boundaries, along which the misorientation gradually changes from the angles above 30° to the ones below a tolerance angle of 2°, have been examined. The development of such boundaries was shown to demonstrate early stage of the fragmentation process.
steel; steel plates; inhomogeneous dynamic deformation; microstructure
https://mpm.spbstu.ru/article/2015.43.8/
MPM324_08_rybin.pdf
RAR
RUS
266-277
Ufa State Aviation Technical University
Botkin
Ufa, Russia
Ufa State Aviation Technical University
Valiev
R.Z.
Ufa, Russia
Ufa State Aviation Technical University
Kublikova
Ufa, Russia
Ufa State Aviation Technical University
Varenik
Ufa, Russia
Computer modeling of metal damage during severe plastic deformation of long-length titanium billets by equal channel angular pressing conform
https://mpm.spbstu.ru/article/2015.43.9/
MPM324_09_botkin.pdf
RAR
RUS
278-283
STR Group ‒ Soft-Impact, Ltd.
Rudinsky
St.Petersburg, Russia
STR Group ‒ Soft-Impact, Ltd.
Karpov
St.Petersburg, Russia
Aalto University
Lipsanen
Aalto, Finland
F-1445-2014
7202768874
0000-0003-3738-408X
ITMO University
Romanov
Alexey
alexey.romanov@niuitmo.ru
St.Petersburg, Russia
Critical thickness and bow of pseudomorphic InxGa1-xAs-based laser heterostructures grown on (001)GaAs and (001)InP substrates
Using the energy-balance approach, we have estimated critical thickness for misfit dislocation (MD) formation and wafer bow for single- and multi-layer InGaAs-based pseudomorphic heterostructures used in light-emitting devices. Indicating the onset of stress relaxation via MD formation, the analysis of critical thicknesses serves as a guideline for device structure design avoiding extensive defect generation usually accompanying the relaxation. Estimates of structure bow are helpful for meeting requirements of the wafer post-growth processing technology. Suggested methodology may be applied to optimization of strain-compensated semiconductor laser heterostructures.
InxGa1-xAs-based laser heterostructures; (001)GaAs substrate; (001)InP substrate; critical thickness; bow
https://mpm.spbstu.ru/article/2015.43.10/
MPM324_10_rudinsky.pdf
RAR
RUS
284-288
Connector Optics LLC
Novikov
St.Petersburg, Russia
Connector Optics LLC
Karachinsky
St.Petersburg, Russia
ITMO University
Egorov
St.Petersburg, Russia
Connector Optics LLC
Babichev
St.Petersburg, Russia
ITMO University
Kurochkin
St.Petersburg, Russia
ITMO Univesity
Kolodeznyi
St.Petersburg, Russia
Connector Optics LLC
Gladyshev
St.Petersburg, Russia
Molecular beam epitaxy grown strained heterostructures for active region of laser diode with emission wavelength 1520-1580 nm
We describe strained semiconductor heterostructures InGaAlAs/InGaAs/InP fabricated by molecular beam epitaxy and designed for active region of laser diode with emission wavelength 1520-1580 nm. Structural and optical properties of the strained semiconductor heterostructures InGaAlAs/InGaAs/InP were studied by X-ray diffraction and photoluminescence analysis. We confirm the possibility to use strained semiconductor heterostructures InGaAlAs/InGaAs/InP for active region of laser diode with 1.6 % lattice mismatch between InGaAs quantum wells and InP substrate.
laser diode; wavelength 1520-1580 nm; molecular beam epitaxy; strained heterostructures; structural properties; optical properties
https://mpm.spbstu.ru/article/2015.43.11/
MPM324_11_babichev.pdf
RAR
RUS
289-296
Peter the Great St. Petersburg Polytechnic University
Orlov
St.Petersburg, Russia
Institute of Experimental Medicine
Polyakov
St.Petersburg, Russia
ITMO University
Skomorokhova
St.Petersburg, Russia
ITMO University
Sukhanova
St.Petersburg, Russia
ITMO University
Rozhkova
St.Petersburg, Russia
Herzen State Pedagogical University of Russia
Babich
St.Petersburg, Russia
Herzen State Pedagogical University of Russia
Kudryavtseva
St.Petersburg, Russia
Togliatti State University
M.R. Shafeev
Togliatti, Russia
F-1445-2014
7202768874
0000-0003-3738-408X
ITMO University
Romanov
Alexey
alexey.romanov@niuitmo.ru
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Puchkova
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Sankova
St.Petersburg, Russia
Togliatti State University
Sosnin
Togliatti, Russia
Peter the Great St. Petersburg Polytechnic University
Karpenko
St.Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Ilyechova
St.Petersburg, Russia
On the biological activity of silver nanoparticles
Silver nanoparticles (SNPs) were synthesized by reduction of silver ions to elementary silver in the system of β -cyclodextrin clathrates. SNPs were characterized by optical spectroscopy, microscopy (AFM, TEM), and X-ray diffractometry. Toxicity of the SNPs was tested in viruses, bacteria, yeast, cultured human cell lines, mollusks, and mammals. The particles displayed high antimicrobial activity and low toxicity in eukaryotic cells. The invertebrates were found to be more sensitive to SNPs, than mammals. Silver from SNPs was transported (apparently as Ag(I)) into the cells of prokaryotes and eukaryotes, bound to Cu(I) transport proteins. Silver was unevenly distributed between cell organelles; it was inserted to active centers of cuproenzymes and impaired their activity. The prospects to use these SNPs as antimicrobial agents, which enhance the action of antibiotics, as inhibitors of copper transport to growing tumors, and as a tool for studying copper metabolism are discussed.
silver nanoparticles; virus; Escherichia coli; Saccharomyces cerevisiae; cell lines HepG2 and HEK293; mollusks; mammals; copper metabolism
https://mpm.spbstu.ru/article/2015.43.12/
MPM324_12_puchkova.pdf
RAR
RUS
297-307
Ufa State Aviation Technical University
Valiev
R.Z.
Ufa, Russia
Ufa State Aviation Technical University
Medvedev
Ufa, Russia
Ufa State Aviation Technical University
Murashkin
Maxim Yu.
Ufa, Russia
Ufa State Aviation Technical University
Enikeev
Ufa, Russia
Institute of Problems of Mechanical Engineering RAS
I.A. Ovid’ko
И.А.
St.Petersburg, Russia
Strength and electrical conductivity of ultrafine-grained aluminum alloy Al-2Fe subjected to annealing and straining
In this work the influence of thermal treatment and deformation processing on the microstructure, mechanical properties and electrical conductivity of ultrafine-grained (UFG) aluminum alloy Al-2Fe was considered. The UFG structure in the alloy was formed by high pressure torsion (HPT) at room temperature. As was demonstrated, HPT leads to the formation of UFG structure accompanied by the refinement of ferrum aluminide particles to nano-scale, change in their composition as well as dissolution of up to 1 wt.% Fe in aluminum. It was revealed that the optimum combination of strength and electrical conductivity in the UFG alloy can be achieved through additional ageing during annealing or subsequent straining at 200 °С.
ultrafine-grained aluminum alloy Al-2Fe; high pressure torsion; annealing; strength; electrical conductivity
https://mpm.spbstu.ru/article/2015.43.13/
MPM324_13_medvedev.pdf