Kharkov Physicotechnical Institute

Kharkiv, Ukraine

Kharkov Physicotechnical Institute

Kharkiv, Ukraine
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Zubkov A.I.,Kharkiv Polytechnic Institute | Zubarev E.N.,Kharkiv Polytechnic Institute | Sobol' O.V.,Kharkiv Polytechnic Institute | Hlushchenko M.A.,Kharkiv Polytechnic Institute | Lutsenko E.V.,Kharkov Physicotechnical Institute
Physics of Metals and Metallography | Year: 2017

The structure of vacuum condensate foils (separated from substrates) of the binary Cu–Ta system has been investigated both in the initial condensed state and after annealings at temperatures of up to 1000°С. It has been shown that the alloying of a vapor flow of the matrix metal (copper) with tantalum to ~0.5 at % makes it possible to reduce the grain size from 3 μm to 50 nm. Depending on the tantalum concentration, condensates exhibit a broad spectrum of structural states, i.e., single- and two-phase, a supersaturated solution of tantalum in the fcc lattice of copper, etc. The structure of the objects possesses a high thermal stability. The temperature of the start of grain growth in the copper matrix depends on the tantalum content and can reach 900°С. The dispersion of the structure of copper condensates and its thermal stability is due to the formation of segregates of tantalum atoms at the boundaries of grains of the copper matrix both in the process of condensation and upon subsequent annealing. © 2017, Pleiades Publishing, Ltd.

Sobol O.V.,Kharkiv Polytechnic Institute | Andreev A.A.,Kharkov Physicotechnical Institute | Gorban V.F.,Frantsevich Institute for Problems of Materials Science
Metal Science and Heat Treatment | Year: 2016

The possibilities of structural engineering in multiperiod TiN/Ti, TiN/CrN, TiN/MoN and TiN/ZrN systems are presented. Three principal parameters determining the structural state and properties of the coatings are determined, i.e., the substrate potential during the deposition, the thickness of layers in a period, and the pressure of the working atmosphere. The results of the study are used to develop deposition modes providing high mechanical properties in the coatings. © 2016 Springer Science + Business Media New York.

Marynin V.H.,Kharkov Physicotechnical Institute
Materials Science | Year: 2010

The cavitation strength of 15Kh11MF and 15Kh12VNMF steels after nitriding and deposition of vacuum arc titanium and titanium nitride coatings is investigated. Kinetic curves of fracture of specimens under the action of cavitation and polarization curves in a 3% aqueous solution of NaCl are obtained, and the microhardness is measured. A steel-coatings system is thermocycled by the scheme 293 K-543 K-293 K with cooling in a 3% NaCl solution. The serviceability of the system is confirmed. © 2010 Springer Science+Business Media, Inc.

Korytchenko K.V.,Kharkiv Polytechnic Institute | Golota V.I.,Kharkov Physicotechnical Institute | Kudin D.V.,Kharkov Physicotechnical Institute | Rodionov S.V.,Kharkov Physicotechnical Institute
Journal of Engineering Physics and Thermophysics | Year: 2013

The mechanisms of action on a high-current spark discharge that make it possible to reduce the total expenditure of electric energy on initiating detonation have been proposed. The action is based on the control of a discharge current with the aid of an external circuit and on the addition of easily ionizable admixtures to a fuel-oxygen mixture. Results of experimental investigations into the spark-discharge initiation of detonation with the action on the discharge process have been presented; the results were obtained in mixtures of hydrogen with oxygen and of commercial propane-butane with oxygen at atmospheric pressure. © 2013 Springer Science+Business Media New York.

Bakai S.A.,Kharkov Physicotechnical Institute | Volchok O.I.,Kharkov Physicotechnical Institute | Stoev P.I.,Kharkov Physicotechnical Institute | Kamyshanchenko N.V.,Belgorod State University | Kungurtsev E.S.,Belgorod State University
Acoustical Physics | Year: 2012

The effect of preliminary ultrasound action on the mechanical properties and features of the structure of zirconium-based bulk metallic glasses has been studied by the method of acoustic emission under uniaxial compression. Results of studies have been interpreted using the polycluster model of the structure of amorphous metallic alloys. Analysis of the obtained data has allowed us to substantiate the mechanism of the change in the structure and strength of metallic glasses as a result of alternating-sign mechanical loading with an ultrasound frequency of 20 kHz. © Pleiades Publishing, Ltd., 2012.

Nikiforov V.I.,Kharkov Physicotechnical Institute | Uvarov V.L.,Kharkov Physicotechnical Institute
Radiochemistry | Year: 2010

Features of determination of the isotope yield in production of isotopes at an electron accelerator are analyzed. Based on the model developed for describing the spatial and energy characteristics of the accelerator bremsstrahlung, a method is suggested for analytical evaluation of the isotope yields under the conditions characteristic of photonuclear isotope production. The validity of the assumptions made is checked by comparison of the model with the results of computer simulation. The reactions 68Zn(γ,p) 67Cu and 100Mo(γ,n) 99Mo are considered as examples in the practically significant range of accelerated electron energies of 40-100 MeV, with a tungsten bremsstrahlung converter. © Pleiades Publishing, Inc., 2010.

Basteev A.V.,National Aerospace University - Kharkiv Aviation Institute | Dashkov A.V.,Industrial Scientific Corporation | Kravchenko O.V.,A M Podgornyi Institute For The Problems Of Mechanical Engineering | Repalova O.N.,Kharkov Physicotechnical Institute | Forfutdinov V.V.,National Aerospace University - Kharkiv Aviation Institute
Journal of Engineering Physics and Thermophysics | Year: 2010

The process of growth of the boundary crystallized phase in the motion of a heated non-Newtonian fluid in a channel with a cold wall has been studied experimentally. As the fluid, polypropylene with pseudoplastic properties was used. Experimental curves of the growth of the wall crystallized phase as a function of time were obtained for different values of the initial fluid melt temperature. The experimental value of the Nusselt number at the solid-liquid interface has been computed. © 2010 Springer Science+Business Media, Inc.

Kistanov A.A.,Russian Academy of Sciences | Murzaev R.T.,Russian Academy of Sciences | Dmitriev S.V.,Russian Academy of Sciences | Dubinko V.I.,Kharkov Physicotechnical Institute | Khizhnyakov V.V.,University of Tartu
JETP Letters | Year: 2014

An ansatz has been proposed for setting the initial conditions in the molecular dynamics study of moving discrete breathers in monoatomic close packed crystals. The applicability of the ansatz has been demonstrated for a two-dimensional crystal with Morse interaction. © 2014 Pleiades Publishing, Inc.

Murzaev R.T.,RAS Institute for Metals Superplasticity Problems | Kistanov A.A.,RAS Institute for Metals Superplasticity Problems | Dubinko V.I.,Kharkov Physicotechnical Institute | Terentyev D.A.,Belgian Institute for Nuclear Sciences | Dmitriev S.V.,Tomsk State University
Computational Materials Science | Year: 2015

By means of molecular dynamics simulations it is demonstrated that moving discrete breathers (DBs) can be excited in pure bcc metals such as V, Fe and W. For each of the three metals, the following properties of the DBs are estimated: the frequency as the function of amplitude, the degree of spatial localization and the maximum propagation velocity. For the three studied metals, DB frequency lies above the phonon spectrum and increases with increasing DB amplitude. DBs in vanadium are much more spatially localized and robust than in iron and tungsten. Application of the presented results to the DB-induced mechanism of the void ordering under irradiation is discussed. © 2014, Elsevier B.V. All rights reserved.

Vynohradov D.V.,Kharkov Physicotechnical Institute | Voevodin V.M.,Kharkov Physicotechnical Institute | Tykhonovs'Kyi M.A.,Kharkov Physicotechnical Institute | Kolodii I.V.,Kharkov Physicotechnical Institute | Bovda O.M.,Kharkov Physicotechnical Institute
Materials Science | Year: 2013

We study the interaction of hydrogen with zirconium in different structural states, i.e., from the nanocrystalline state to the coarse-crystalline state. The phase composition and structure of hydrides in hydrogenated zirconium specimens with different initial microstructures are determined. The kinetics of sorption of hydrogen by nanocrystalline zirconium at different temperatures and the desorption processes running in the course of continuous heating in vacuum are investigated. It is shown that the initial temperature of absorption, phase composition, and the amount of absorbed hydrogen strongly depend on the structural state of zirconium. © 2013 Springer Science+Business Media New York.

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