Liudmila Kveglis - Academia.edu (original) (raw)

Papers by Liudmila Kveglis

Research paper thumbnail of The Features of Structure Formation in the Iron-Copper at High Dynamic Loading

The possibility of metastable phases formation at the interface of two metals with limited solubi... more The possibility of metastable phases formation at the interface of two metals with limited solubility (Cu-Fe) was investigated. It is shown that such phases may be the as a product of solid state reactions taking place at high pressures.

Research paper thumbnail of Electrolyte-Plasma Strengthening of Surface Layers of Aluminum Alloy

Journal of Siberian Federal University. Engineering & Technologies, 2018

This article presents the results of studies of the effect of electrolyte-plasma treatment on the... more This article presents the results of studies of the effect of electrolyte-plasma treatment on the structural-phase transformation of aluminum alloy samples. The discharge was ignited from a constant current source. When the voltage is turned on, ionization and boiling of the electrolyte take place. When a bubble boiling occurs around the active electrode, large current pulsations are observed. Due to the formation of the gas-vapor jacket and the passage of electric current through it, a low-temperature plasma is formed which has a characteristic blue color of the glow of the shell around the part. On the surface of the product, an electric microarc plasma is excited, in which heat is generated from the intense heating of the workpiece. After microarc oxidation, a microstructure of quenching and artificial aging in the electrolyte flow is observed on the sample surface. As a result of quenching in the electrolyte stream, the solid copper solution in aluminum and the fine fine inclusions dissolve from the temperature of the microplasma, the phases oxidizing form aluminum corundum. X-ray diffraction analysis of samples after electrolyteplasma treatment revealed an increase in intensity and broadening of the diffraction lines relative to the initial state, which indicates the residual stress of the surface, which in the process of operation provides an increase in wear resistance of the part. The average microhardness, after electrolytic-plasma treatment, is 746 mpa, which is approximately 2.5 times higher than that of the starting material.

Research paper thumbnail of Structural-Phase Conditions and Flow Stress at Plastic Deformation of Steel 12Х18Н10Т

Journal of Siberian Federal University. Engineering & Technologies, 2019

The article presents the results of structural and phase transformations and their correlation wi... more The article presents the results of structural and phase transformations and their correlation with microhardness in steel 12X18H10T after thermomechanical treatment and high-temperature plastic deformation. Assessments of the true flow stress during high-temperature uniaxial tension

Research paper thumbnail of Phase with Spinel Structure Type in Plastically Deformed Ni Ti

Journal of Siberian Federal University. Engineering & Technologies, 2017

The alloy samples Ni 51 Ti 49 , subjected to plastic deformation were investigated. The microstru... more The alloy samples Ni 51 Ti 49 , subjected to plastic deformation were investigated. The microstructure and the microdiffraction were investigated by transmission electron microscopy Hitachi 7700. Discs with a diameter of 3 mm for investigation by transmission electron microscopy (TEM) was cut from the fracture zone of the stretched sample. They were mechanically thinned, then electrochemically etched until the hole in the center. The final step was to prepare ion etching in install PIPS (Gatan). TEM specimens were subjected cryomechanical processing. This was done by in liquid nitrogen cooling cyclically. The phase composition of the samples was determined by X-ray diffraction diffractometer "Bruker" using copper radiation. The lens-form crystals Ni 2 Ti 3 , containing bending contours, indicating significant internal stresses in the zones of stress localization were detected. The lens-form crystals can be represented as a non-equilibrium phase Ni 2 Ti 3 with spinel structure type with lattice parameter 11,53 ± 0,03 Å. For the formation of lenticular crystals of nonequilibrium phase Ni 2 Ti 3 it is necessary redistribution of the original solid solution components. In local curvature of the crystalline lattice areas, the increased interatomic distances created the special structural states. These states increase the number of degrees of freedom in a deformable solid and thus contribute to the emergence of new phases.

Research paper thumbnail of The Reason of Sign-Variable Thermoelectric Effect in Fe86Mn13C Alloy

Advanced Materials Research, 2013

The unique electrical and magnetic properties Fe86Mn13C alloy (Hadfild's steel) are due to sp... more The unique electrical and magnetic properties Fe86Mn13C alloy (Hadfild's steel) are due to special modulated structure. The alloy is widely used in mechanical engineering. Complex studies of the structure and properties of the alloy both in bulk samples and thin-films are suggested to describe the creation of a deformation martensite structure in Fe86Mn13C alloy in the form of self-assembled clusters. It is shown that combinations of anti-ferromagnetic austenite and ferrimagnetic martensite of deformation create unique electric and magnetic properties of Fe86Mn13C alloy both in bulk and in a thin-film state. We seek to explain the reason for the change of the sign of thermoelectric effect depending on temperature. Our task is to investigate thin Fe86Mn13C films as a possible solution to the problems of spintronics.

Research paper thumbnail of Investigating deformation martensite in thinned samples and films of Fe86Mn13C alloy

Bulletin of the Russian Academy of Sciences: Physics, 2014

The structure and properties of film and bulk samples of Fe 86 Mn 13 C alloy are investigated exp... more The structure and properties of film and bulk samples of Fe 86 Mn 13 C alloy are investigated exper imentally. The formation of the deformation martensite structure in Fe 86 Mn 13 C alloy is described in terms of cluster models of FCC and BCC structures.

Research paper thumbnail of Структура и магнитные свойства нанокристаллических пленок железа (Фролов Г.И. и др. // ФММ, 1999, т. 88, № 2, с. 85)

Research paper thumbnail of Electronic structure of grain boundaries in the Fe86-Mn12.7-C1.3alloy

Russian Physics Journal, 2008

ABSTRACT The importance of studying Fe-Mn-C alloys is related to their wide use as constructional... more ABSTRACT The importance of studying Fe-Mn-C alloys is related to their wide use as constructional materials in mechanical engineering. In this work an effort has been made to elucidate the physical origin of the magnetization in austenitic steels by calculating the electronic structure of grain boundaries. To theoretically investigate the magnetic properties of a crystal of ferromagnetic bcc iron, the wave functions of the iron atom calculated in view of the spin polarization of a core by the Hartree-Fock method with local exchange-correlation potentials have been used as base functions. This has made it possible to optimize the choice of a zero approximation for the description of the electronic states of ferromagnetic iron and to attain good agreement with the experimental values of the magnetic moment (µtheor = 2.23µB, µexp = 2.218µB), of the exchange splitting of the crystal term P4 (Δtheor = Δexp = 0.112 Ry), and of the cross-sections of the Fermi surface. A similar approach has been used to investigate the magnetic states of clusters (nanoclusters) based on the method of scattered waves. The approach developed for clusters of the alloy under investigation makes it possible to calculate the alloy magnetic properties in relation to the cluster size for a varied lattice parameter.

Research paper thumbnail of Lorentz's Electron Microscopy of Thin Films with Frustrated Magnetic Structure

Solid State Phenomena, 2014

The unique electrical and magnetic properties Fe86Mn13C alloy (Hadfield's steel) are due to s... more The unique electrical and magnetic properties Fe86Mn13C alloy (Hadfield's steel) are due to special modulated structure. The alloy is widely used in mechanical engineering. Complex studies of the structure and properties of the alloy both in bulk samples and thin-films are suggested to describe the formation of a deformation martensite structure in Fe86Mn13C alloy in the form of self-assembled clusters. It is shown that combinations of anti-ferromagnetic austenite and ferrimagnetic martensite of deformation create unique electric and magnetic properties of Fe86Mn13C alloy both in bulk and in a thin-film state. We seek to explain the reason for the change of the sign of thermoelectric effect depending on temperature. Our task is to investigate thin Fe86Mn13C films as a possible solution to the problems of spintronics.

Research paper thumbnail of Abnormally Fast Migration of Substance at Shock Loadings

Advanced Materials Research, 2013

This research work is investigates the processes of structure formation in the samples were 110Г1... more This research work is investigates the processes of structure formation in the samples were 110Г13Л subjected to shock loads. The processes of structure formation, initiated by shock waves are explained from the terms of new theoretical developments. Analysis of the results can be extended to a wide range of materials.

Research paper thumbnail of Fe-Mn-C alloys with anomalous volume of crystal lattice

Bulletin of the Russian Academy of Sciences: Physics, 2008

ABSTRACT The structure of intergranular interlayers in the 110G13L steel have been investigated. ... more ABSTRACT The structure of intergranular interlayers in the 110G13L steel have been investigated. An increase in the lattice volume and occurrence of magnetization under dynamic load of samples quenched to austenite have been revealed.

Research paper thumbnail of Electron microscopy and Mössbauer study of superlattices in iron films

Research paper thumbnail of Nanosized cobalt ferrite powders obtained by pyrolytic extraction

Theoretical Foundations of Chemical Engineering, 2010

ABSTRACT Heterostructures were prepared from MSM molecular sieves and magnetic materials by extra... more ABSTRACT Heterostructures were prepared from MSM molecular sieves and magnetic materials by extraction pyrolysis. The molecular sieves were filled with solutions of extracts and heated to remove the organic phase and form an inorganic material. The annealing and dissolution of the MSM-41 molecular sieve gave nanosized cobalt ferrite powder with particles of 40 nm and a coercive force 5000 Oe.

Research paper thumbnail of Synthesis, microstructure, and the transport and magnetic properties of Bi-containing high-temperature superconductors with a porous structure

Technical Physics Letters, 2003

Preliminary data on the synthesis and physical properties of polycrystalline Bi 1.8 Pb 0.3 Sr 2 C... more Preliminary data on the synthesis and physical properties of polycrystalline Bi 1.8 Pb 0.3 Sr 2 Ca 2 Cu 3 O x high-temperature superconductors of low density with a foam-like microstructure are reported.

Research paper thumbnail of Mechanochemical effects in titanium nickelide-stainless steel bilayer samples

Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques, 2011

... It is seen that, after carrying out the experiment, components were redistributed on the surf... more ... It is seen that, after carrying out the experiment, components were redistributed on the surface of stainless steel and tita nium was revealed. ... Bilayer Samples LI Kveglisa, RB Abylkalykovab, EM Seilhanovb, GB Tajibaevab, and VV Kazantsevaa aSiberian Federal University, pr. ...

Research paper thumbnail of Phenomenon of enhanced diffusion during quasistatic uniaxial tension of a Ni3Al alloy

Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques, 2012

ABSTRACT Ni particles generated under the action of quasistatic uniaxial tension in an area of sa... more ABSTRACT Ni particles generated under the action of quasistatic uniaxial tension in an area of sample rupture have been revealed in Ni3A1-alloy samples by magnetometry and energy dispersive structure analysis methods. A method of simulating the accelerated diffusion process, based on the shear-transformation zone model was offered for the qualitative description of the experiment’s results.

Research paper thumbnail of Local electron structure and magnetization in - Fe86Mn13C

Superlattices and Microstructures, 2009

ABSTRACT The aim of the work is to elucidate the origin of magnetization presence in austenitic F... more ABSTRACT The aim of the work is to elucidate the origin of magnetization presence in austenitic Fe86Mn13C steel after dynamic loading.The observation of microstructures in the region of transition from FCC austenitic Fe86Mn13C steel to FK12+FK14 type of Frank–Kasper tetrahedral close packed structure is described. We used the methods of optical microscopy, electron microscopy, electron diffraction and X-ray-diffraction to investigate the phase transition region. Changes of local magnetization were estimated by induction method.To explain the magnetization origin of the sample consisting of austenite grains and intergranular layers, which have Frank–Kasper’s structure (FK12+FK14) typical of β–Fe–Mn, the local electronic structure has been investigated for intergranular layers. The local electron structure of FK12 and FK14 clusters have been simulated by method of self-consistent field to understand the nature of non-zero magnetization of the Fe87Mn13 alloy exposed by shock deformation. It was shown, that numbers of states with upward and downward spins are not equal. Therefore the occurrence of magnetization is possible.

Research paper thumbnail of Anomalously fast macroscopic migration

Steel in Translation, 2012

Research paper thumbnail of Structural self-organization and the formation of perpendicular magnetic anisotropy in Co50Pd50 nanocrystalline films

Physics of the Solid State, 2001

ABSTRACT The correlation of the atomic-order structure and the energy density of perpendicular ma... more ABSTRACT The correlation of the atomic-order structure and the energy density of perpendicular magnetic anisotropy in Co50Pd50 films is investigated. Structural models for nanocrystalline Co50Pd50 films are proposed. It is shown that processes of structural self-organization in the films form nontrivial atomic-order structures. These structures can exist owing to high elastic stresses, which apparently ensure the emergence of strong magnetic anisotropy (K-perpendicular to similar to 10(6) erg/cm(3)). (C) 2001 MAIK "Nauka/Interperiodica".

Research paper thumbnail of Formation of tetrahedrally close-packed structures in Tb-Fe and Co-Pd nanocrystalline films

Physics of the Solid State, 2002

ABSTRACT The crystal structure of Tb30Fe70 and Co50Pd50 nanocrystalline films with strong magneti... more ABSTRACT The crystal structure of Tb30Fe70 and Co50Pd50 nanocrystalline films with strong magnetic anisotropy perpendicular to the film plane (K ⊥ ∼ 106 erg/cm3) is investigated using electron diffraction and transmission electron microscopy. All the studied films in the initial nanocrystalline phase undergo an explosive crystallization with the formation of dendrite structures. It is demonstrated that, after crystallization, the Tb-Fe and Co-Pd films exhibit a tetrahedrally close-packed atomic structure that has no analogs among these materials in the equilibrium state. The internal stresses in the films under investigation are estimated from an analysis of the bend extinction contours in the electron microscope images. The inference is made that strong perpendicular magnetic anisotropy can be associated with magnetostriction anisotropy due to the specific features of the film structure.

Research paper thumbnail of The Features of Structure Formation in the Iron-Copper at High Dynamic Loading

The possibility of metastable phases formation at the interface of two metals with limited solubi... more The possibility of metastable phases formation at the interface of two metals with limited solubility (Cu-Fe) was investigated. It is shown that such phases may be the as a product of solid state reactions taking place at high pressures.

Research paper thumbnail of Electrolyte-Plasma Strengthening of Surface Layers of Aluminum Alloy

Journal of Siberian Federal University. Engineering & Technologies, 2018

This article presents the results of studies of the effect of electrolyte-plasma treatment on the... more This article presents the results of studies of the effect of electrolyte-plasma treatment on the structural-phase transformation of aluminum alloy samples. The discharge was ignited from a constant current source. When the voltage is turned on, ionization and boiling of the electrolyte take place. When a bubble boiling occurs around the active electrode, large current pulsations are observed. Due to the formation of the gas-vapor jacket and the passage of electric current through it, a low-temperature plasma is formed which has a characteristic blue color of the glow of the shell around the part. On the surface of the product, an electric microarc plasma is excited, in which heat is generated from the intense heating of the workpiece. After microarc oxidation, a microstructure of quenching and artificial aging in the electrolyte flow is observed on the sample surface. As a result of quenching in the electrolyte stream, the solid copper solution in aluminum and the fine fine inclusions dissolve from the temperature of the microplasma, the phases oxidizing form aluminum corundum. X-ray diffraction analysis of samples after electrolyteplasma treatment revealed an increase in intensity and broadening of the diffraction lines relative to the initial state, which indicates the residual stress of the surface, which in the process of operation provides an increase in wear resistance of the part. The average microhardness, after electrolytic-plasma treatment, is 746 mpa, which is approximately 2.5 times higher than that of the starting material.

Research paper thumbnail of Structural-Phase Conditions and Flow Stress at Plastic Deformation of Steel 12Х18Н10Т

Journal of Siberian Federal University. Engineering & Technologies, 2019

The article presents the results of structural and phase transformations and their correlation wi... more The article presents the results of structural and phase transformations and their correlation with microhardness in steel 12X18H10T after thermomechanical treatment and high-temperature plastic deformation. Assessments of the true flow stress during high-temperature uniaxial tension

Research paper thumbnail of Phase with Spinel Structure Type in Plastically Deformed Ni Ti

Journal of Siberian Federal University. Engineering & Technologies, 2017

The alloy samples Ni 51 Ti 49 , subjected to plastic deformation were investigated. The microstru... more The alloy samples Ni 51 Ti 49 , subjected to plastic deformation were investigated. The microstructure and the microdiffraction were investigated by transmission electron microscopy Hitachi 7700. Discs with a diameter of 3 mm for investigation by transmission electron microscopy (TEM) was cut from the fracture zone of the stretched sample. They were mechanically thinned, then electrochemically etched until the hole in the center. The final step was to prepare ion etching in install PIPS (Gatan). TEM specimens were subjected cryomechanical processing. This was done by in liquid nitrogen cooling cyclically. The phase composition of the samples was determined by X-ray diffraction diffractometer "Bruker" using copper radiation. The lens-form crystals Ni 2 Ti 3 , containing bending contours, indicating significant internal stresses in the zones of stress localization were detected. The lens-form crystals can be represented as a non-equilibrium phase Ni 2 Ti 3 with spinel structure type with lattice parameter 11,53 ± 0,03 Å. For the formation of lenticular crystals of nonequilibrium phase Ni 2 Ti 3 it is necessary redistribution of the original solid solution components. In local curvature of the crystalline lattice areas, the increased interatomic distances created the special structural states. These states increase the number of degrees of freedom in a deformable solid and thus contribute to the emergence of new phases.

Research paper thumbnail of The Reason of Sign-Variable Thermoelectric Effect in Fe86Mn13C Alloy

Advanced Materials Research, 2013

The unique electrical and magnetic properties Fe86Mn13C alloy (Hadfild's steel) are due to sp... more The unique electrical and magnetic properties Fe86Mn13C alloy (Hadfild's steel) are due to special modulated structure. The alloy is widely used in mechanical engineering. Complex studies of the structure and properties of the alloy both in bulk samples and thin-films are suggested to describe the creation of a deformation martensite structure in Fe86Mn13C alloy in the form of self-assembled clusters. It is shown that combinations of anti-ferromagnetic austenite and ferrimagnetic martensite of deformation create unique electric and magnetic properties of Fe86Mn13C alloy both in bulk and in a thin-film state. We seek to explain the reason for the change of the sign of thermoelectric effect depending on temperature. Our task is to investigate thin Fe86Mn13C films as a possible solution to the problems of spintronics.

Research paper thumbnail of Investigating deformation martensite in thinned samples and films of Fe86Mn13C alloy

Bulletin of the Russian Academy of Sciences: Physics, 2014

The structure and properties of film and bulk samples of Fe 86 Mn 13 C alloy are investigated exp... more The structure and properties of film and bulk samples of Fe 86 Mn 13 C alloy are investigated exper imentally. The formation of the deformation martensite structure in Fe 86 Mn 13 C alloy is described in terms of cluster models of FCC and BCC structures.

Research paper thumbnail of Структура и магнитные свойства нанокристаллических пленок железа (Фролов Г.И. и др. // ФММ, 1999, т. 88, № 2, с. 85)

Research paper thumbnail of Electronic structure of grain boundaries in the Fe86-Mn12.7-C1.3alloy

Russian Physics Journal, 2008

ABSTRACT The importance of studying Fe-Mn-C alloys is related to their wide use as constructional... more ABSTRACT The importance of studying Fe-Mn-C alloys is related to their wide use as constructional materials in mechanical engineering. In this work an effort has been made to elucidate the physical origin of the magnetization in austenitic steels by calculating the electronic structure of grain boundaries. To theoretically investigate the magnetic properties of a crystal of ferromagnetic bcc iron, the wave functions of the iron atom calculated in view of the spin polarization of a core by the Hartree-Fock method with local exchange-correlation potentials have been used as base functions. This has made it possible to optimize the choice of a zero approximation for the description of the electronic states of ferromagnetic iron and to attain good agreement with the experimental values of the magnetic moment (µtheor = 2.23µB, µexp = 2.218µB), of the exchange splitting of the crystal term P4 (Δtheor = Δexp = 0.112 Ry), and of the cross-sections of the Fermi surface. A similar approach has been used to investigate the magnetic states of clusters (nanoclusters) based on the method of scattered waves. The approach developed for clusters of the alloy under investigation makes it possible to calculate the alloy magnetic properties in relation to the cluster size for a varied lattice parameter.

Research paper thumbnail of Lorentz's Electron Microscopy of Thin Films with Frustrated Magnetic Structure

Solid State Phenomena, 2014

The unique electrical and magnetic properties Fe86Mn13C alloy (Hadfield's steel) are due to s... more The unique electrical and magnetic properties Fe86Mn13C alloy (Hadfield's steel) are due to special modulated structure. The alloy is widely used in mechanical engineering. Complex studies of the structure and properties of the alloy both in bulk samples and thin-films are suggested to describe the formation of a deformation martensite structure in Fe86Mn13C alloy in the form of self-assembled clusters. It is shown that combinations of anti-ferromagnetic austenite and ferrimagnetic martensite of deformation create unique electric and magnetic properties of Fe86Mn13C alloy both in bulk and in a thin-film state. We seek to explain the reason for the change of the sign of thermoelectric effect depending on temperature. Our task is to investigate thin Fe86Mn13C films as a possible solution to the problems of spintronics.

Research paper thumbnail of Abnormally Fast Migration of Substance at Shock Loadings

Advanced Materials Research, 2013

This research work is investigates the processes of structure formation in the samples were 110Г1... more This research work is investigates the processes of structure formation in the samples were 110Г13Л subjected to shock loads. The processes of structure formation, initiated by shock waves are explained from the terms of new theoretical developments. Analysis of the results can be extended to a wide range of materials.

Research paper thumbnail of Fe-Mn-C alloys with anomalous volume of crystal lattice

Bulletin of the Russian Academy of Sciences: Physics, 2008

ABSTRACT The structure of intergranular interlayers in the 110G13L steel have been investigated. ... more ABSTRACT The structure of intergranular interlayers in the 110G13L steel have been investigated. An increase in the lattice volume and occurrence of magnetization under dynamic load of samples quenched to austenite have been revealed.

Research paper thumbnail of Electron microscopy and Mössbauer study of superlattices in iron films

Research paper thumbnail of Nanosized cobalt ferrite powders obtained by pyrolytic extraction

Theoretical Foundations of Chemical Engineering, 2010

ABSTRACT Heterostructures were prepared from MSM molecular sieves and magnetic materials by extra... more ABSTRACT Heterostructures were prepared from MSM molecular sieves and magnetic materials by extraction pyrolysis. The molecular sieves were filled with solutions of extracts and heated to remove the organic phase and form an inorganic material. The annealing and dissolution of the MSM-41 molecular sieve gave nanosized cobalt ferrite powder with particles of 40 nm and a coercive force 5000 Oe.

Research paper thumbnail of Synthesis, microstructure, and the transport and magnetic properties of Bi-containing high-temperature superconductors with a porous structure

Technical Physics Letters, 2003

Preliminary data on the synthesis and physical properties of polycrystalline Bi 1.8 Pb 0.3 Sr 2 C... more Preliminary data on the synthesis and physical properties of polycrystalline Bi 1.8 Pb 0.3 Sr 2 Ca 2 Cu 3 O x high-temperature superconductors of low density with a foam-like microstructure are reported.

Research paper thumbnail of Mechanochemical effects in titanium nickelide-stainless steel bilayer samples

Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques, 2011

... It is seen that, after carrying out the experiment, components were redistributed on the surf... more ... It is seen that, after carrying out the experiment, components were redistributed on the surface of stainless steel and tita nium was revealed. ... Bilayer Samples LI Kveglisa, RB Abylkalykovab, EM Seilhanovb, GB Tajibaevab, and VV Kazantsevaa aSiberian Federal University, pr. ...

Research paper thumbnail of Phenomenon of enhanced diffusion during quasistatic uniaxial tension of a Ni3Al alloy

Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques, 2012

ABSTRACT Ni particles generated under the action of quasistatic uniaxial tension in an area of sa... more ABSTRACT Ni particles generated under the action of quasistatic uniaxial tension in an area of sample rupture have been revealed in Ni3A1-alloy samples by magnetometry and energy dispersive structure analysis methods. A method of simulating the accelerated diffusion process, based on the shear-transformation zone model was offered for the qualitative description of the experiment’s results.

Research paper thumbnail of Local electron structure and magnetization in - Fe86Mn13C

Superlattices and Microstructures, 2009

ABSTRACT The aim of the work is to elucidate the origin of magnetization presence in austenitic F... more ABSTRACT The aim of the work is to elucidate the origin of magnetization presence in austenitic Fe86Mn13C steel after dynamic loading.The observation of microstructures in the region of transition from FCC austenitic Fe86Mn13C steel to FK12+FK14 type of Frank–Kasper tetrahedral close packed structure is described. We used the methods of optical microscopy, electron microscopy, electron diffraction and X-ray-diffraction to investigate the phase transition region. Changes of local magnetization were estimated by induction method.To explain the magnetization origin of the sample consisting of austenite grains and intergranular layers, which have Frank–Kasper’s structure (FK12+FK14) typical of β–Fe–Mn, the local electronic structure has been investigated for intergranular layers. The local electron structure of FK12 and FK14 clusters have been simulated by method of self-consistent field to understand the nature of non-zero magnetization of the Fe87Mn13 alloy exposed by shock deformation. It was shown, that numbers of states with upward and downward spins are not equal. Therefore the occurrence of magnetization is possible.

Research paper thumbnail of Anomalously fast macroscopic migration

Steel in Translation, 2012

Research paper thumbnail of Structural self-organization and the formation of perpendicular magnetic anisotropy in Co50Pd50 nanocrystalline films

Physics of the Solid State, 2001

ABSTRACT The correlation of the atomic-order structure and the energy density of perpendicular ma... more ABSTRACT The correlation of the atomic-order structure and the energy density of perpendicular magnetic anisotropy in Co50Pd50 films is investigated. Structural models for nanocrystalline Co50Pd50 films are proposed. It is shown that processes of structural self-organization in the films form nontrivial atomic-order structures. These structures can exist owing to high elastic stresses, which apparently ensure the emergence of strong magnetic anisotropy (K-perpendicular to similar to 10(6) erg/cm(3)). (C) 2001 MAIK "Nauka/Interperiodica".

Research paper thumbnail of Formation of tetrahedrally close-packed structures in Tb-Fe and Co-Pd nanocrystalline films

Physics of the Solid State, 2002

ABSTRACT The crystal structure of Tb30Fe70 and Co50Pd50 nanocrystalline films with strong magneti... more ABSTRACT The crystal structure of Tb30Fe70 and Co50Pd50 nanocrystalline films with strong magnetic anisotropy perpendicular to the film plane (K ⊥ ∼ 106 erg/cm3) is investigated using electron diffraction and transmission electron microscopy. All the studied films in the initial nanocrystalline phase undergo an explosive crystallization with the formation of dendrite structures. It is demonstrated that, after crystallization, the Tb-Fe and Co-Pd films exhibit a tetrahedrally close-packed atomic structure that has no analogs among these materials in the equilibrium state. The internal stresses in the films under investigation are estimated from an analysis of the bend extinction contours in the electron microscope images. The inference is made that strong perpendicular magnetic anisotropy can be associated with magnetostriction anisotropy due to the specific features of the film structure.