45 research outputs found
Investigation the effect of machining conditions on the orientation of the crystal lattice of metals and alloys with cubic and hexagonal lattice
Π¦Π΅Π»ΡΡ Π²ΡΠΏΠΎΠ»Π½ΡΠ΅ΠΌΠΎΠΉ ΡΠ°Π±ΠΎΡΡ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΈΠ·ΡΡΠ΅Π½ΠΈΠ΅ Π²Π»ΠΈΡΠ½ΠΈΡ ΡΠ΅ΠΆΠΈΠΌΠΎΠ² ΡΠ΅ΡΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ, ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΈ ΡΠ΅ΡΠΌΠΎΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΎΠΊ Π½Π° ΠΎΡΠΈΠ΅Π½ΡΠ°ΡΠΈΡ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅ΡΠ΅ΡΠΊΠΈ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² ΠΏΡΠΈ ΠΏΠΎΠΌΠΎΡΠΈ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΎΠ±ΠΎΡΡΠ΄ΠΎΠ²Π°Π½ΠΈΡ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Π½ΠΎΠ³ΠΎ Π² Π£ΡΠ°Π»ΡΡΠΊΠΎΠΌ ΡΠ΅Π΄Π΅ΡΠ°Π»ΡΠ½ΠΎΠΌ ΡΠ½ΠΈΠ²Π΅ΡΡΠΈΡΠ΅ΡΠ΅. Π ΡΠ°Π±ΠΎΡΠ΅ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ ΠΈΠ·ΡΡΠ΅Π½ΠΈΠ΅, Π²Π»ΠΈΡΠ½ΠΈΡ ΡΠ΅ΠΆΠΈΠΌΠΎΠ² ΡΠ΅ΡΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ, ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΈ ΡΠ΅ΡΠΌΠΎΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΎΠΊ Π½Π° ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠ΅ Π²ΡΠΎΡΡΡ
ΡΠ°Π·, ΠΎΡΠΈΠ΅Π½ΡΠ°ΡΠΈΡ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅ΡΠ΅ΡΠΊΠΈ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ², ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ ΡΠ°ΡΡΡΠΎΠ²ΠΎΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠΉ ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ ΠΈ Π΄ΠΈΡΡΠ°ΠΊΡΠΈΠΈ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΡΠ°ΡΡΠ΅ΡΠ½ΡΡ
ΡΠ»Π΅ΠΊΡΡΠΎΠ½ΠΎΠ².The aim of the work is the study on the effect of thermal, mechanical and thermo-mechanical treatments on the orientation of the crystal materials lattice. In the paper the study on the effect of thermal, mechanical and thermo-mechanical treatments on the formation of secondary phases and the orientation of the crystal materials lattice by scanning electron microscopy and electron backscatter diffraction.ΠΡΠΎΠ³ΡΠ°ΠΌΠΌΠ° ΡΠ°Π·Π²ΠΈΡΠΈΡ Π£ΡΠ€Π£ Π½Π° 2013 Π³ΠΎΠ΄ (ΠΏ.2.1.2.1
Effects of Sliding Velocity and Thermal Conduction of the Tool on X20Cr4 Steel Friction Coefficient and Structure in Nanostructuring Burnishing
The developmental study has succeeded in finding how the sliding velocity of an indenter affects the friction coefficient and changes the structure and phase state in the surface layer of a X20Cr13 stainless steel when nanostructuring burnishing is done with a tool with no heat removal and, alternatively, when the tool is equipped with a cooling system. It has been shown that structural dispersion of the treated material results in obtaining 20β―80 nm nanocrystallites if the friction coefficient of the spherical synthetic diamond indenter is within 0.15β―0.18 nm. Application of a compact cooling system, based on Peltier's thermoelectric module, made it possible to stabilize the friction coefficient at 0.17 and to increase the sliding velocity from 13 m/min, this being the case of no heat removal, to 45 m/min in the case when the cooling system having a cooling performance of 120 W was used. TEM and SEM analyses of the surface layer structure confirmed that there is a correlation between the friction coefficient and the size of nanocrystallites and the thickness of the dispersed layer. EBSD analysis of the structure showed that a maximum permissible sliding velocity can be established as referenced to the nucleation and growth of Ξ³-phase grains in the nanostructured layer caused by heating of the material under deformation and reaching the temperature beyond the point Ξ±βΞ³ phase transition as well as by behavior of dynamic recrystallization. It was established that the heat removal ensures suppression of dynamic recrystallization when the sliding velocity is increased up to 50 m/min. Β© 2018 Published under licence by IOP Publishing Ltd
Surface Texture of Deformed Copper Wire
The texture of the cold-drawn copper wire was investigated along the radius and on surface by means of EBSD. The wire fiber texture after drawing has been shown to consist of a set of a main orientations analogically to the rolling texture. These texture orientations are associated to the stress state in drawing. The central area of the wire was characterized by two main orientations: faint and powerful -fibers. Main orientations {110} and {112} were distinguished within these fibers. The peripheral region is represented by a shear texture that rotates 90 to the center texture and scattered at 10 . The surface texture scattered close to axial and also has deviated preferred components: strong {110} and weak {112} orientations. Β© Published under licence by IOP Publishing Ltd
Characterization of the matrix and fusion crust of the recent meteorite fall Ozerki L6
We studied the interior and the fusion crust of the recently recovered Ozerki L6 meteorite using optical microscopy, scanning electron microscopy (SEM) with energy dispersive spectroscopy, X-ray diffraction (XRD), magnetization measurements, and Mossbauer spectroscopy. The phase composition of the interior and of the fusion crust was determined by means of SEM, XRD, and Mossbauer spectroscopy. The unit cell parameters for silicate crystals were evaluated from the X-ray diffractograms and were found the same for the interior and the fusion crust. Magnetization measurements revealed a decrease of the saturation magnetic moment in the fusion crust due to a decrease of Fe-Ni-Co alloy content. Both XRD and Mossbauer spectroscopy show the presence of magnesioferrite in the fusion crust. The temperatures of cation equilibrium distribution between the M1 and M2 sites in silicates calculated using the data obtained from XRD and Mossbauer spectroscopy appeared to be in a good consistency: 553 and 479 K for olivine and 1213 and 1202 K for orthopyroxene.Peer reviewe
Surface-dependent osteoblasts response to TiO2 nanotubes of different crystallinity
One of the major challenges of implantology is to design nanoscale modifications of titanium implant surfaces inducing osseointegration. The aim of this study was to investigate the behavior of rat osteoblasts cultured on anodized TiO2 nanotubes of different crystallinity (amorphous and anatase phase) up to 24 days. TiO2 nanotubes were fabricated on VT1β0 titanium foil via a two-step anodization at 20 V using NH4F as an electrolyte. Anatase-phase samples were prepared by heat treatment at 500 Β°C for 1 h. VT1β0 samples with flat surfaces were used as controls. Primary rat osteoblasts were seeded over experimental surfaces for several incubation times. Scanning electron microscopy (SEM) was used to analyze tested surfaces and cell morphology. Cell adhesion and proliferation were investigated by cell counting. Osteogenic differentiation of cells was evaluated by qPCR of runt-related transcription factor 2 (RUNX2), osteopontin (OPN), integrin binding sialoprotein (IBSP), alkaline phosphatase (ALP) and osteocalcin (OCN). Cell adhesion and proliferation, cell morphology and the expression of osteogenic markers were affected by TiO2 nanotube layered substrates of amorphous and anatase crystallinity. In comparison with flat titanium, along with increased cell adhesion and cell growth a large portion of osteoblasts grown on the both nanostructured surfaces exhibited an osteocyte-like morphology as early as 48 h of culture. Moreover, the expression of all tested osteogenic markers in cells cultured on amorphous and anatase TiO2 nanotubes was upregulated at least at one of the analyzed time points. To summarize, we demonstrated that amorphous and anodized TiO2 layered substrates are highly biocompatible with rat osteoblasts and that the surface modification with about 1500 nm length nanotubes of 35 Β± 4 (amorphous phase) and 41 Β± 8 nm (anatase phase) in diameter is sufficient to induce their osteogenic differentiation. Such results are significant to the engineering of coating strategies for orthopedic implants aimed to establish a more efficient bone to implant contact and enhance bone repair. Β© 2020 by the author. Licensee MDPI, Basel, Switzerland.Deutscher Akademischer Austauschdienst,Β DAADRussian Science Foundation,Β RSF: 18β13β00220Ministry of Education and Science of the Russian Federation,Β Minobrnauka: 57447934PPN/BEK/2018/1/00071Funding: The experimental work was funded by the Russian Science Foundation (grant no. 18β13β00220). This research was partially supported by DAAD together with the Ministry of Education and Science of the Russian Federation within Michael Lomonosov Program (project No. 57447934); M.W. was financially supported by the Polish National Agency for Academic Exchange (PPN/BEK/2018/1/00071)
Luminescence in anion-deficient hafnia nanotubes
Hafnia-based nanostructures and other high-k dielectrics are promising
wide-gap materials for developing new opto- and nanoelectronics devices. They
possess a unique combination of physical and chemical properties such as
insensitivity to electrical and optical degradation, radiation damage
stability, a high specific surface area, and an increased concentration of the
appropriate active electron-hole centers. The present paper aims to investigate
the structural, optical, and luminescent properties of anodized
non-stoichiometric nanotubes. As-grown amorphous hafnia nanotubes and
nanotubes annealed at 700{\deg}C with a monoclinic crystal lattice served as
samples. It has been shown that the bandgap for direct allowed
transitions amounts to eV for amorphous and eV for
monoclinic nanotubes. For the first time, we have studied the features of the
intrinsic cathodoluminescence and photoluminescence of the obtained nanotubular
structures with an atomic deficiency in the anion sublattice at
temperatures of 10 and 300 K. A broad emission band with a maximum of 2.3-2.4
eV has been revealed. We have also conducted an analysis of the kinetic
dependencies of the observed photoluminescence for synthesized samples
in the millisecond range at room temperature. It showed that there are several
types of optically active capture and emission centers based on vacancy states
in the and positions with different coordination numbers and
a varied number of localized charge carriers (, , and ). The
uncovered regularities can be used to optimize the functional characteristics
of developed-surface luminescent media based on nanotubular and nanoporous
modifications of hafnia.Comment: 15 pages, 6 figures, 3 tables, 50 reference
FORMATION OF RECRYSTALLIZATION TEXTURE IN A COPPER CAPILLARY TUBE
The texture state of copper capillary tube after cold drawing and annealing was studied by orientation microscopy. It is shown that in the process of recrystallization a texture is formed, the components of which are related with deformation ones by rotation about an axis at angles of 50Β°-70Β°.Π Π°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΏΡΠΈ ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΠΎΠΉ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠ΅ Π³ΡΠ°Π½ΡΠ° ΠΡΠ΅Π·ΠΈΠ΄Π΅Π½ΡΠ° Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ Π€Π΅Π΄Π΅ΡΠ°ΡΠΈΠΈ (ΠΏΡΠΎΠ΅ΠΊΡ ΠΠ-5882.2021.4)
THE DEFORMATION AND RECRYSTALLIZATION TEXTURE OF THE FCC METALS
ΠΠ° ΠΏΡΠΈΠΌΠ΅ΡΠ΅ ΡΠ»Π΅ΠΊΡΡΠΎΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΈΡΡΠΎΠΉ ΠΌΠ΅Π΄ΠΈ ΠΏΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΡΠ΅ΠΊΡΡΡΡΠ° Π²ΠΎΠ»ΠΎΡΠ΅Π½ΠΈΡ ΠΠ¦Π-ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠ² ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΠ΅Ρ ΡΠΎΠ±ΠΎΠΉ Π½Π°Π±ΠΎΡ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΈΡ
ΠΏΡΠ΅Π΄ΠΏΠΎΡΡΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΠΎΡΠΈΠ΅Π½ΡΠ°ΡΠΈΠΉ, ΠΏΠΎΠ΄ΠΎΠ±Π½ΠΎ ΡΠ΅ΠΊΡΡΡΡΠ΅ ΠΏΡΠΎΠΊΠ°ΡΠΊΠΈ. Π ΠΏΠ΅ΡΠΈΡΠ΅ΡΠΈΠΉΠ½ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ ΠΏΡΠΎΠ²ΠΎΠ»ΠΎΠΊΠΈ ΡΠΎΡΠΌΠΈΡΡΠ΅ΡΡΡ ΡΠ΅ΠΊΡΡΡΡΠ°, Π±Π»ΠΈΠ·ΠΊΠ°Ρ ΠΊ ΡΠ΅ΠΊΡΡΡΡΠ΅ ΡΠ΄Π²ΠΈΠ³Π°, ΠΊΠΎΡΠΎΡΠ°Ρ ΠΏΠΎΠ²Π΅ΡΠ½ΡΡΠ° ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΡΠ΅ΠΊΡΡΡΡΡ ΡΠ΅Π½ΡΡΠ°Π»ΡΠ½ΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ Π½Π° ΡΠ³ΠΎΠ» Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΎ ΠΌΠ΅Π½ΡΡΠΈΠΉ, ΡΠ΅ΠΌ 90Β°. Π Π°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ ΠΎΡΠ½ΠΎΠ²Π½ΡΡ
ΠΎΡΠΈΠ΅Π½ΡΠ°ΡΠΈΠΉ ΠΏΠΎ ΡΠ΅ΡΠ΅Π½ΠΈΡ Π΄Π΅ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ ΠΏΡΠΎΠ²ΠΎΠ»ΠΎΠΊΠΈ ΡΠ²ΡΠ·Π°Π½ΠΎ Ρ Π½Π°ΠΏΡΡΠΆΠ΅Π½Π½ΠΎ-Π΄Π΅ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΡΠΌ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ΠΌ, Π²ΠΎΠ·Π½ΠΈΠΊΠ°ΡΡΠΈΠΌ ΠΏΡΠΈ Π²ΠΎΠ»ΠΎΡΠ΅Π½ΠΈΠΈ.In the case of electrolytic tough pitch copper wire, the drawing texture of FCC metals has been shown to consist of several preferred orientations, similar to the rolling texture. Texture similar to the shear one was formed in the periphery region, although it was rotated to the texture of central region at an angle slightly smaller than 90Β°. The distribution of the main preferred orientations along the cross section of deformed wire was explained with the stress-state occurring upon drawing in the central and periphery regions.Π Π°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΏΡΠΈ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠ΅ Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠ³ΠΎ ΡΠΎΠ½Π΄Π° ΡΡΠ½Π΄Π°ΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ (Π³ΡΠ°Π½Ρ 16-32-00030-ΠΌΠΎΠ»_Π°)
Laws of Formation Recrystallization Texture in the Wire of Technical Pure Aluminum
Π Ρ
ΠΎΠ΄Π΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π±ΡΠ»ΠΎ ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ ΡΠ΅ΠΊΡΡΡΡΠ½ΠΎΠ΅ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ Π°Π»ΡΠΌΠΈΠ½ΠΈΠ΅Π²ΠΎΠΉ ΠΏΡΠΎΠ²ΠΎΠ»ΠΎΠΊΠΈ ΠΏΠΎΡΠ»Π΅ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΈ ΡΠ΅ΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΠ·Π°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΎΡΠΆΠΈΠ³Π°. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΡΠ΅ΠΊΡΡΡΡΡ ΠΏΡΠΎΠ²ΠΎΠ»ΠΎΠΊΠΈ ΠΏΠΎΡΠ»Π΅ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΈ Π½Π° Π»ΠΎΠΊΠ°Π»ΡΠ½ΠΎΠΌ ΡΡΠΎΠ²Π½Π΅ ΠΌΠΎΠΆΠ½ΠΎ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡ ΠΊΠ°ΠΊ ΡΠ΅ΠΊΡΡΡΡΡ, ΡΠΎΡΡΠΎΡΡΡΡ ΠΈΠ· Π΄ΠΈΡΠΊΡΠ΅ΡΠ½ΡΡ
ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½Ρ, ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΡ
ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΡΠΌ ΠΎΡΠΈΠ΅Π½ΡΠΈΡΠΎΠ²ΠΊΠ°ΠΌ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Π° Π²Π·Π°ΠΈΠΌΠΎΡΠ²ΡΠ·Ρ ΠΎΡΠΈΠ΅Π½ΡΠΈΡΠΎΠ²ΠΎΠΊ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΈ ΡΠ΅ΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΠ·Π°ΡΠΈΠΈ Π² ΠΏΡΠ΅Π΄ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠΈ, ΡΡΠΎ ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½ΡΠΌΠΈ Π³ΡΠ°Π½ΠΈΡΠ°ΠΌΠΈ ΠΏΡΠΈ ΡΠ΅ΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΠ·Π°ΡΠΈΠΈ ΡΠ²Π»ΡΡΡΡΡ ΡΠΏΠ΅ΡΠΈΠ°Π»ΡΠ½ΡΠ΅ Π³ΡΠ°Π½ΠΈΡΡ, Π±Π»ΠΈΠ·ΠΊΠΈΠ΅ ΠΊ Ξ£3.During the study, the textural state of the aluminum wire after deformation and recrystallization annealing has been established. It is shown that the texture of the wire after deformation at the local level can be considered as consisting of discrete components corresponding to stable orientations. The relationship between the orientations of deformation and recrystallization is established on the assumption that special boundaries close to Ξ£3 are mobile during recrystallization.Π Π°Π±ΠΎΡΠ° Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΏΡΠΈ ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΠΎΠΉ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠ΅ Π³ΡΠ°Π½ΡΠ° ΠΡΠ΅Π·ΠΈΠ΄Π΅Π½ΡΠ° Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ Π€Π΅Π΄Π΅ΡΠ°ΡΠΈΠΈ (ΠΏΡΠΎΠ΅ΠΊΡ ΠΠβ5882.2021.4).The work was supported financially by a grant from the President of the Russian Federation (project MKβ5882.2021.4)
LΓΌders deformation in specimens made of normalized 09G2S steel
The features of LΓΌders deformation in the normalized 09G2S steel are studied by the methods of digital image correlation, topography, and scanning electron microscopy of specimen faces. The paper studies the appearance, growth, structure, and location of deformation bands, as well as plastic strain in them. Β© 2021 Elsevier B.V.. All rights reserved.Ministry of Education and Science of the Russian Federation,Β Minobrnauka: AAAA-A18-118020190116-6The study was performed at the IMP UB RAS under a state assignment from the Ministry of Education and Science of Russia (theme Structure, No. AAAA-A18-118020190116-6) and within the research plan of the IES U