https://www.elibrary.ru/title_about_new.asp?i
1605-8119
Materials physics and mechanics
33
1
2017
1-177
RAR
RUS
1-11
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Baimova
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Rysaeva
Ufa, Russia
Institute for Metals Superplasticity Problems
Dmitriev
Ufa, Russia
Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences
Lisovenko
Moscow, Russia
Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences
Gorodtsov
Moscow, Russia
Institute of Problems of Mechanical Engineering RAS
Indeitsev
St.Petersburg, Russia
Auxetic behaviour of carbon nanostructures
Various carbon nanostructures and their properties are of great interest nowadays. It is well known that graphene has unique mechanical properties among other carbon nanomaterials and at some conditions graphene can show auxetic behavior which means that it can have negative Poisson’s ratio. From the consideration of the mechanical properties of graphene and 3D carbon-based nanomaterials, several groups of promising candidates to be auxetics can be mentioned. In this study, mechanical properties of strained graphene and different diamond-like three-dimensional structures based on carbon nanotubes (tubulanes) are investigated by molecular dynamics method. It is shown that graphene has negative Poisson’s ratio under homogeneous tensile strain above 0.12. It is found that three of the studied tubulanes have negative Poisson’s ratio.
10.18720/MPM.3312017_1
auxetics
graphene
tubulanes
carbon nanostructure
mechanical properties
https://mpm.spbstu.ru/article/2017.57.1/
MPM133_01_baimova.pdf
RAR
RUS
12-18
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Shagiev
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Galeyev
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Valiakhmetov
Ufa, Russia
Ti2AlNb-based intermetallic alloys and composites
Optimization of the chemical composition of Ti2AlNb-based alloy resulted in development of high-strength Ti-20.3Al-22.1Nb-1.2Zr-1.3V-0.9Mo-0.3Si (at.%) intermetallic with rather low density ρ≈5.1 g/cm3. Mechanical properties of the alloy were considerably improved due to formation of the homogeneous ultrafine-grained structure. The ultrafine-grained material exhibited both high strength and ductility at room temperature (σUTS=1400 MPa; δ=25%) and superplastic behavior in the temperature range of 850-1000°C (δmax=930% at T=900°C). The metal-intermetallic composites consisting of alternating layers of the orthorhombic intermetallic alloy and the commercial high-temperature titanium alloywere produced. The 3-layered composite had high strength and reasonable ductility both at room and elevated temperatures: σUTS=1235 MPa and δ=4% at T=20°C; σUTS=875 MPa and δ=21% at T=600°C.
10.18720/MPM.3312017_2
intermetallic Ti2AlNb-based alloy
ultrafine-grained material
mechanical properties
metal/intermetallic composite
https://mpm.spbstu.ru/article/2017.57.2/
MPM133_02_shagiev.pdf
RAR
RUS
19-28
Institute for Metals Superplasticity Problems of RAS
Avtokratova
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Sitdikov
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Мarkushev
Ufa, Russia
Superplasticity of Al-Mg-Sc(Zr) alloys, subjected to intense plastic deformation
The data devoted to the high-strain-rate superplasticity of Al-Mg alloys containing dispersoids of aluminides of scandium and zirconium and having ultrafine-grained structure produced by severe plastic deformation were reviewed. The potential of various severe plastic deformation techniques to improve the superplastic characteristics of Al-Mg-Sc(Zr) alloys was discussed. The origin of high superplastic properties as well as their degradation is considered depending on the regimes and methods of deformation. The effectiveness of treatment mode, combining severe and conventional deformation to process sheets with high-temperature superplastic properties is evaluated.
10.18720/MPM.3312017_3
aluminum alloy
severe plastic deformation
ultrafine grain structure
high strain rate superplasticity.
https://mpm.spbstu.ru/article/2017.57.3/
MPM133_03_avtokratova.pdf
RAR
RUS
29-40
Institute for Metals Superplasticity Problems, Russian Academy of Science
Aletdinov
Ufa, Russia
Tohoku University
Mironov
Sendai, Japan
Institute for Metals Superplasticity Problems, Russian Academy of Science
Korznikova
Ufa, Russia
Ufa State Aviation Technical University
Zaripova
Ufa, Russia
University of Strathclyde
Konkova
Inchinnan, UK
Baikov Institute of Metallurgy and Material Science, Russian Academy of Science
Myshlyaev
Moscow, Russia
EBSD analysys of austenite steel microstructure after cryogenic rolling
This work is based on the use of electron backscatter diffraction (EBSD) methods to investigate the microstructure of metastable austeniticsteel 12X18Н10T (321) after cryogenic rolling. Cryogenic deformation was accompanied by martensitic transformations, and the martensitic phase nucleation mainly in deformation bands. It is assumed that the proceeding of the martensitic transformation in the most deformed parts of the microstructure should prevent the evolution of deformation-induced boundaries in the austenite and, thus, inhibit the process of fragmentation of this phase. Mechanical twinning was the primary (or even sole) mechanism providing HAB formation in the austenite.
10.18720/MPM.3312017_4
austenitic steel
cryogenic rolling
martensite
grain boundaries
microstructure
EBSD
https://mpm.spbstu.ru/article/2017.57.4/
MPM133_04_aletdinov.pdf
RAR
RUS
41-48
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Baimova
Ufa, Russia
Southern Federal University Research institute of physics
Shcherbinin
Rostov-on-Don, Russia
Southern Federal University Research institute of physics
Chechin
Rostov-on-Don, Russia
Institute for Metals Superplasticity Problems
Dmitriev
Ufa, Russia
On the stability of one-dimensional bushes in graphene
Earlier it has been proved that graphene supports four one-dimensional bushes (symmetry dictated, delocalized nonlinear vibrational modes), describing in-plane atomic vibrations. In this paper, the stability of two of them is investigated by the molecular dynamics method. It is found that for oscillation amplitudes greater than a certain critical value, the bushes lose their stability, and the critical exponent increases linearly with increasing amplitude above the critical value.
10.18720/MPM.3312017_4 5
graphene
bushes of nonlinear modes
molecular dynamics
https://mpm.spbstu.ru/article/2017.57.5/
MPM133_05_baimova.pdf
RAR
RUS
49-56
Ufa State Petroleum Technical University
Bachurina
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Murzaev
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Korznikova
Ufa, Russia
Institute for Metals Superplasticity Problems
Dmitriev
Ufa, Russia
Investigation of one-dimensional nonlinear vibrational model in FCC aluminum
It is known that the nonlinearity of interatomic interactions can ensure the existence of spatially localized vibrational modes in the crystal lattice. In the present work, we investigate a one-dimensional nonlinear vibrational mode of a new type in a defect-free FCC single crystal. In this mode, the atoms of one close-packed series oscillate with the same amplitude in antiphase with the nearest neighbors. The amplitudes of atomic vibrations in neighboring close-packed chains are much smaller and decrease rapidly with distance from the excited chain. The considered vibrational mode can be classified as a discrete breather (DB) of a special form, in which the oscillations are localized in two spatial directions and are delocalized in the third direction (along a close-packed atomic row). The obtained results broaden our understanding of the nonlinear dynamics of the crystal lattice of FCC metals
10.18720/MPM.3312017_6
molecular dynamics
aluminum
linear discrete breathers
https://mpm.spbstu.ru/article/2017.57.6/
MPM133_06_bachurina.pdf
RAR
RUS
57-68
Institute for Metals Superplasticity Problems of RAS
Galieva
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Valitov
Ufa, Russia
Ufa state aviation technological university
Zhigalova
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Lutfulin
Ufa, Russia
Institute for metals superplasticity problems RAS
Akhunova
Ufa, Russia
Formation of the joint during solid-state bonding of Ni-based superalloys EP975 and EK79
The effect of pressure welding involving a shear strain along the contact surface on the formation of a solid-state joint of dispersion-strengthened Ni-based superalloys EK79 and EP975 is studied. Quality of the joints is assessed in terms of porosity and tensile strength tests. It is shown that a 20 µm width transition diffusion zone is formed in the solid-state joint area during the pressure welding process. EDX analysis revealed the occurrence of cross diffusion processes of alloying elements W, Al, Cr in the diffusion zone. According to the tensile tests at room temperature, it is found that the solid-state joint strength is about 0.49-0.62 of the EK79 alloy strength level.
10.18720/MPM.3312017_7
heat-resistant Ni-based superalloys
pressure welding
solid-state joint
heat treatment
shear strain
joint strength
https://mpm.spbstu.ru/article/2017.57.7/
MPM133_07_galieva.pdf
RAR
RUS
69-79
Altai State Humanitarian and Pedagogical University. V.M. Shukshin
Zakharov
Biysk, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Korznikova
Ufa, Russia
Institute for Metals Superplasticity Problems
Dmitriev
Ufa, Russia
Surface discrete breathers in the Pt3Al intermetallic alloy
It is known that defect-free crystals having a wide gap in the phonon spectrum can support gap discrete breathers (DB) being spatially localized large amplitude vibrational modes with frequencies within theband gap. One of examples of such crystal type is the intermetallic alloy Pt3Al with a a gap in the phonon spectrum caused by large difference in the atomic masses of the components. In the present work, the first attempts of the molecular dynamics modelling studiesof the DB close to atomically smooth (100) orientation surface of the crystal is presented. It is shown that properties of the DB depend essentially on the composition of the surface atomic plane, which for the considered crystal can consist of Pt atoms or both of Pt and Al atoms in equal proportions. The results obtained can significantly contribute to the development of surface physics science.
10.18720/MPM.3312017_8
molecular dynamics
biatomic crystals
discrete breathers
https://mpm.spbstu.ru/article/2017.57.8/
MPM133_08_zakharov.pdf
RAR
RUS
80-96
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Imayev
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Imayev
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Gaisin
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Nazarova
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Shagiev
Ufa, Russia
Institute for Metals Superplasticity Problems (RAS)
Mulyukov
R.R.
Ufa, Russia
Heat-resistant intermetallic alloys and composites based on titanium: microstructure, mechanical properties and possible application
In the paper, microstructure design by means of hot working and heat treatment as well as some mechanical properties have been considered for intermetallic alloys based on γ(TiAl) and O(Ti2AlNb) phase. It has been shown that the current scientific and technical knowledge creates the prerequisites for development of both cast and wrought processing methods of these intermetallic alloys, particularly based on superplastic processing. In the paper, the results on discontinuously reinforced metal matrix Ti/TiB based composites produced in situ via conventional casting were also presented. For the matrix made of the alloy VT18U (Ti-6.8Al-4Zr-2.5Sn-1Nb-0.7Mo-0.15Si, wt. %), it has been demonstrated that the presence of TiB whiskers provided significant enhancement in strength and creep resistance as compared with those of the matrix alloy.
10.18720/MPM.3312017_9
intermetallic alloys
in situ composites
microstructure
hot working
heat treatment
mechanical properties
https://mpm.spbstu.ru/article/2017.57.9/
MPM133_09_imayev.pdf
RAR
RUS
97-103
Institute for Metals Superplasticity Problems of RAS
Kashaev
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Nagimov
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Husnullin
Ufa, Russia
Cyclic crack resistance of linear friction welded Ti-6Al-4V alloy joints
Kinetic diagrams of the fatigue crack growth rate of Ti-6Al-4V with various structures, namely lamellar, globular, bimodal and its linear friction welds, are presented. The lamellar structure showed a better crack growth resistance than the globular and bimodal structures. Cyclic crack growth resistance of linear friction weld is comparable to that of Ti6Al-4V titanium alloy with lamellar structure. For an alloy with fine-grained globular and bimodal structures for stress intensity < (15-20) MPa m0.5, the fatigue crack growth rate in linear friction weld is less than in base metal and for stress intensity > (15-20) MPa m0.5 crack growth rate in linear friction weld is close to the crack growth rate in base metal.
10.18720/MPM.3312017_10
cyclic crack resistance
linear friction welding
Ti-alloys
https://mpm.spbstu.ru/article/2017.57.10/
MPM133_10_kashaev.pdf
RAR
RUS
104-112
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Korznikov
Ufa, Russia
Institute for Metals Superplasticity Problems, Russian Academy of Science
Korznikova
Ufa, Russia
Influence of the structure on the deformation ability of the Fe-Cr-Co system alloys
The deformation behavior of two hard magnetic alloys 23X15KТ (Fe-23% Cr-15% Co) and 30X23K (Fe-30% Cr-23% Co) have been studied in the temperature range 800-1050 °C and strain rates 10-1 - 10-4 s-1. The influence of two types of structures - ultrafinegrained and lamellar (α+γ in the 23Х15КТ alloy and γ+σ in the alloy 30Х23К) on the superplasticity characteristics of alloys was established. During tensile straining of the 30X23K alloy with a lamellar structure, the flow stress after 10% deformation is gradually decreased, while in the alloy 23X15K, on the contrary, the deformation proceeds with hardening. It is shown that the investigated alloys with an ultrafine-grained structure exhibit superplastic behavior both under tensile straining and upsetting deformation in the temperature range of 900-950 °С and deformation rates of 10-2 - 10-4 s-1.
10.18720/MPM.3312017_11
superplasticity
ultrafine-grained structure
hard magnetic alloys
https://mpm.spbstu.ru/article/2017.57.11/
MPM133_11_korznikov.pdf
RAR
RUS
113-123
Institute for Metals Superplasticity Problems of RAS
Мarkushev
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Avtokratova
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Ilyasov
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Krymskiy
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Sitdikov
Ufa, Russia
Effect of aging and re-aging on nanostructuring and strenghening of severely deformed aluminum alloy
The effect of preliminary and post-deformation heat treatment on structure and hardness of severely deformed aluminum alloy D16 was investigated. Pre-quenched and aged at 190 °C from 1 to 10 hrs alloy was subjected to high pressure torsion (HPT) (N=10 turns, P=6 GPA, T=20 °C), and then to re-aging at 100 °C up to 100 hrs. Despite of ~ 40 HV increase in the alloy hardness at aging before HPT and also reduction in development of the nanostructure under HPT, hardness of all deformed conditions was close and reached 260±10 HV. It was found that re-aging was quite effective for all the alloy states, except peakaged one, to increasing their hardness on 20-50HV with maximum after 50 hrs in pre-quenched alloy. The nature of the alloy structural and mechanical behavior was discussed in detail.
10.18720/MPM.3312017_12
aluminum alloy
severe plastic deformation
nanostructure
aging
https://mpm.spbstu.ru/article/2017.57.12/
MPM133_12_markushev.pdf
RAR
RUS
124-136
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Musabirov
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Safarov
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Galeyev
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Afonichev
Ufa, Russia
Kotel’nikov Institute of Radio Engineering and Electronics of Russian Academy of Sciences
Koledov
Moscow, Russia
Peter the Great St. Petersburg Polytechnic University
Rudskoy
Andrey
St.Petersburg, Russia
Institute for Metals Superplasticity Problems (RAS)
Mulyukov
R.R.
Ufa, Russia
Plastic deformation of the Ni-Mn-Ga alloy by multiple isothernal forging
The paper presents the results of plastic deformation by the multiple isothermal forging on microstructure and martensitic transformation in polycrystalline Ni54.1Mn19.6Ga24.6Si1.7 alloy. The method of plastic deformation was applied to Heusler alloys for the first time. By recording the temperature dependence of thermal expansion in the field of the existence of the martensitic transformation for Heusler alloys, the characteristic temperatures for given phase transformation in the alloy in as-cast state and after deformation processing are determined. After plastic deformation by forging at 680°С the bimodal grain structure of "necklace" type is formed.
10.18720/MPM.3312017_13
plastic deformation
Heusler alloys
multiple isothermal forging
Ni2MnGa alloys
microstructure
https://mpm.spbstu.ru/article/2017.57.13/
MPM133_13_musabirov.pdf
RAR
RUS
137-151
Institute for Metals Superplasticity Problems of RAS
Sitdikov
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Avtokratova
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Мukhametdinova
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Garipova
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Ilyasov
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Мarkushev
Ufa, Russia
Microstructure, mechanical properties and thermal stability of the ultrafine grained Al-Mg-Sc-Zr alloy processed by multy-directional isothermal forging
Changes in the structure and mechanical properties of the billets from the cast nonage-hardenable complex-alloyed 1570C alloy (Al-5Mg-0.18Mn-0.2Sc-0.08Zr, weight%) were studied during multi-directional isothermal forging with decreasing temperature from 325 to 175°C up to cumulative strain e ≈ 24 and subsequent annealing in the temperature interval from 325 to 450°C. It is shown that the multi-directional forging with decreasing temperature can be an effective method providing processing of billets with ultrafine grain structure with the grain size up to 1-2 µm and a favorable combination of strength and ductility in the aluminum alloy 1570C.
10.18720/MPM.3312017_14
aluminum alloy
multidirectional forging
microstructural evolution
ultrafine grained structure
mechanical properties
thermal stability
https://mpm.spbstu.ru/article/2017.57.14/
MPM133_14_sitdikov.pdf
RAR
RUS
152-160
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Utyashev
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Nagimov
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Mukhtarov
Ufa, Russia
Effect of complex loading during isothermal roll-forming on forming of hollow shafts out of hard-to-deform alloys
Fabrication of hollow shafts for gas turbine engines by traditional methods such as forging or pressing is characterized by high labor intensity and a low metal utilization ratio. Low technological effectiveness of these methods is caused by the low plasticity and workability of high-temperature alloys, of which the shafts are fabricated and their complex shapes as well. In the present work, the possibility of using isothermal roll-forming to enhance the efficiency of the manufacturing process of such parts is demonstrated. Computer and physics modeling of the shaft roll-forming process is carried out. The effect of complex loading of a billet and its configuration on strain localization and forming of an article during rollforming are demonstrated. The rational form of a billet is determined and method of its rollforming is developed that allows for forming a given article. The results of the study are used for quasiisothermal roll-forming of a real hollow shaft out of chromium steel EI962-Sh with given shape, a homogeneous structure and high level of mechanical properties.
10.18720/MPM.3312017_15
simulations; roll-forming; isothermal deformation; chromium steel; hollow shaft
https://mpm.spbstu.ru/article/2017.57.15/
MPM133_15_utyashev.pdf
RAR
RUS
161-170
Institute for Metals Superplasticity Problems of RAS
Khisamov
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Nazarov
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Safarov
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Musabirov
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Yumaguzin
Ufa, Russia
Institute for Metals Superplasticity Problems (RAS)
Mulyukov
R.R.
Ufa, Russia
Effect of nanostructuring of Al-6%Mg aluminum alloy cathode on the glow gas-discharge current
The paper presents the results of studies on the effect of deformation nanostructuring of cathodes from aluminum alloy Al-6%Mg on the glow gas-discharge current in a discharge device. Microstructure and work function of nanostructured alloy are studied. It is shown that a decrease of the work function as a result of alloy nanostructuring leads to an increase of potential ion-induced electron emission yield and glow discharge current.
10.18720/MPM.3312017_16
nanostructure
cold cathode
glow gas-discharge
ion-induced electron emission
work function
https://mpm.spbstu.ru/article/2017.57.16/
MPM133_16_khisamov.pdf
RAR
RUS
171-177
Institute for Metals Superplasticity Problems of RAS
Shakhov
Ufa, Russia
Institute for Metals Superplasticity Problems of RAS
Nagimov
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Mukhtarov
Ufa, Russia
Institute for Metals Superplasticity Problems of the Russian Academy of Sciences
Utyashev
Ufa, Russia
Mechanical Engineering Research Institute of RAS
Sukhorukov
Moscow, Russia
Mechanical Engineering Research Institute of RAS
Sidorov
Moscow, Russia
Numerical simulation of superplastic roll-forming of a hollow shaft out of nickel-based superalloy
Numerical simulations of superplastic roll-forming used for manufacturing of hollow shafts out of superalloys are carried out. Configurations of the workpiece and roller, mutual orientations of their rotation planes are varied. Various initial cone-shaped blanks with angles of 15° to 45° between the generatrix and axis, and initial positions of the roller are considered. As a result, an optimal design of the workpiece and tool, which allows one to obtain required shapes and dimensions of a shaft with a bearable deformation load on the existing roll forming equipment are determined. Basing on this, an optimal shape of a blank with a cone angle of 30° is selected.
10.18720/MPM.3312017_17
numerical simulations; isothermal roll-forming; superplasticity; nickel base superalloy; hollow shaft.
https://mpm.spbstu.ru/article/2017.57.17/
MPM133_17_shakhov.pdf