Moscow Institute of Steel And Alloys
Moscow, Russia

MISA National University of Science and Technology or MISiS is Russia's primary technological university in the field of steelmaking and metallurgy. It was established in 1918 as a part of the Moscow Mining Academy. In 1930, it became independent. During Stalin's regime, the Institute was renamed the Stalin Moscow Institute of Steel. It adopted its current name in 1962 after uniting with the Institute of Nonferrous Metals and Gold. The status of Technological University was awarded in 1993. MISIS is the leading university of the Higher Metallurgical Education Association, whose members include universities from Russia, Ukraine, and Kazakhstan. It has joint degree programmes with the Freiberg University of Mining and Technology in Freiberg, Germany and the Institut National Polytechnique de Lorraine in Nancy, France. Wikipedia.

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Novikov V.Y.,Moscow Institute of Steel And Alloys
Materials Letters | Year: 2012

Grain growth under the influence of randomly distributed particles is simulated. After some time of the process evolution at a constant particle volume fraction, suppressed grain growth, abnormal growth and normal growth were observed when moving along the particle size axis. If triple junctions formed by grain boundary and particle surface are taken into account, this affects the above order: at relatively large particle volume fraction, an additional range of normal grain growth occurs in the immediate neighborhood to the range of suppressed growth. Similar behavior in a zone-annealed ODS alloy is described in literature. © 2012 Elsevier B.V. All rights reserved.

Golovin I.S.,Moscow Institute of Steel And Alloys
Physics of Metals and Metallography | Year: 2010

Temperature-dependent internal friction and modulus of elasticity have been studied in samples of pure copper (99.95%) subjected to deformation by equal-channel angular pressing using 1, 4, and 8 passes by the route B C. The influence of deformation and subsequent recrystallization on the parameters of the internal-friction peaks caused by grain-boundary relaxation and recrystallization of severely deformed copper has been determined. Quantitative estimates of the activation parameters of grain-boundary relaxation have been obtained and the limits of its manifestation have been revealed. © 2010 Pleiades Publishing, Ltd.

Glezer A.M.,Moscow Institute of Steel And Alloys
Physics-Uspekhi | Year: 2012

Various studies are conducted to study the creation principles of new-generation multifunctional structural materials. Development of promising amorphous alloys (AA) obtained by rapid quenching from melt (RQM) technique includes formulating the concept of regions of excess free volume, constituting characteristic defects responsible for the processes of plastic deformation and fracture of AAs. Observations have also revealed that a complex combination of defect structures containing low-angle and high-angle grain boundaries whose relative percentages vary, and also defect structures inside the grains of various degrees of perfection. V V Rybin used the concepts of the dominant role of disclination modes when implementing large plastic deformations and related fragmentation processes, and found that the size of the fragments, the basic structural elements, decreases continuously as strain increases and reaches a constant minimum value of 0.2 μm.

Belashchenko D.K.,Moscow Institute of Steel And Alloys
Inorganic Materials | Year: 2012

The embedded atom method potentials calculated earlier for liquid lithium, sodium, potassium, rubidium, and cesium and presented in the form of tables are corrected and represented in a unified analytical form. When the parameters of the potential are adjusted using the known temperature dependence of the melt density along the melting line of the metal, the actual energy rises more rapidly than the simulated energy as the critical point is approached. The likely reason for the discrepancy is the thermal contribution of the electron gas to the energy of the metal. The discrepancy between the simulated energy and the actual energy of the metal at high temperatures can be considerably reduced by taking into consideration the thermal excitation energy of the electrons. © 2012 Pleiades Publishing, Ltd.

Novikov V.Y.,Moscow Institute of Steel And Alloys
Materials Letters | Year: 2013

Grain growth affected by particle drag is numerically simulated, the drag in nanomaterials being ascribed to the presence of small voids. Abnormal grain growth develops in a range of drag magnitudes which widens significantly with a reduction in the initial grain size. The magnitude of the drag that completely prevents grain growth is inversely proportional to the initial grain size. The data obtained lead to the conclusion that grain growth suppression in nanomaterials can be achieved by decreasing their density. © 2013 Published by Elsevier B.V .

Novikov V.Y.,Moscow Institute of Steel And Alloys
Materials Letters | Year: 2012

Numerical simulations of grain growth are carried out on micro-grained polycrystals containing different volume fractions f of particles of radius r. It was supposed that particles are distributed randomly and do not change their size with time. Particles promote abnormal grain growth; this process is not completed and results in formation of duplex microstructure. Disposition to abnormal growth at first increases and then reduces with an increase in f, the latter being especially noticeable at f > r/D 0 where D 0 is the initial grain diameter. Limiting grain size is found to be equal to ∼0.4 r/f. © 2011 Elsevier B.V. All rights reserved.

Novikov V.Y.,Moscow Institute of Steel And Alloys
International Journal of Materials Research | Year: 2011

A duality in the behaviour of small particles, i. e. their ability to migrate along with some grain boundaries and, simultaneously, inability to move along with the others, has been shown to affect the character of the grain growth process. It is found by numerical simulations that a decrease in the particle mobility favours the evolution of abnormal grain growth and that the particle volume fraction, at low particle mobility, also affects its development. It has been supposed that these results explain the evolution of abnormal grain growth in compacted nanocrystalline materials where small voids could play the part of particles. © Carl Hanser Verlag GmbH & Co. KG.

Belashchenko D.K.,Moscow Institute of Steel And Alloys
Physics-Uspekhi | Year: 2013

Methods for and the results of the computer simula-tion of liquid metals are reviewed. Two basic methods, classical molecular dynamics with known interparticle potentials and the ab initio method, are considered. Most attention is given to the simulated results obtained using the embedded atom model (EAM). The thermodynamic, structural, and diffusion proper-ties of liquid metal models under normal and extreme (shock) pressure conditions are considered. Liquid-metal simulated results for the Groups I - IV elements, a number of transition metals, and some binary systems (Fe -C, Fe - S) are examined. Possibilities for the simulation to account for the thermal con-tribution of delocalized electrons to energy and pressure are considered. Solidification features of supercooled metals are also discussed. © 2013 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences.

A numerical technique, which combines FEM analysis of electrode area withmatrix formalism applied to spectral domain analysis (SDA) of eigen modes inmulti-layered substrate and multi-layered dielectric upper half-space, isdescribed as an efficient tool of investigating the wave characteristics inperiodic metal grating sandwiched between two multi-layered half-spaces, witharbitrary thickness of each layer. The universal character of the developedtechnique is illustrated by few examples of its application to different typesof structure providing propagation of common SAW, boundary waves at interface,plate modes, normal modes in a thin film deposited over the grating etc. Thetransformation between the waves with continuously increasing film thicknessescan be observed. © 2010 IEEE.

Novikov V.Yu.,Moscow Institute of Steel And Alloys
Acta Materialia | Year: 2010

The ability of second phase particles to migrate along with grain boundaries is shown to be determined not only by the particle mobility but also by the migration rate of the grain boundary where they locate. This leads to a duality in the mobile particle behaviour: they behave as either movable or immovable depending on the boundary migration rate. In the first case, they reduce the boundary mobility; in the second one they decrease the driving force for boundary migration. It is demonstrated by numerical modeling that mobile particles with low mobility can suppress grain growth even in nanocrystalline material, the limiting grains size being several times smaller than in the case of randomly distributed immobile particles. It is also shown that the Zener solution to the problem of the grain growth retardation by disperse particles is a specific case of the proposed approach. © 2010 Acta Materialia Inc.

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