Contents

Effect of energy fluxes on materials

R.A. Nazipov, A.V. Pyataev, A.A. Ignatyev, Yu.M. Vyzhimov, R.I. Batalov,
R.M. Bayazitov, V.A. Shustov

Effect of power pulsed ion beam irradiation on Fe77Cu1Nb3Si13B6 amorphous alloy:
Mossbauer and X-ray diffraction studies
energy........................................................................................................................... 5

It is found that after exposure to the nanosecond intense ion beam, a change in the direction of the

spontaneous magnetic moment in a thin ribbon of Fe77Cu1Nb3Si13B6 amorphous alloy was occurred.

The average direction of the magnetic moment rotates from the easy plane to normal to the plane of the

ribbon. The angle between the average direction of spontaneous magnetic moment and ribbon plane

varies depending on the fluence of ion beam irradiation.

Keywords: Mossbauer spectroscopy, ion-beam modification of materials, structure transformations

in amorphous metal alloys.

 

Functional coatings and surface treatment

G.A. Pribytkov, V.V. Korzhova

Surface modification of Al-Cr and Al-Cr-Si powder cathodes at heating by vacuum arc............................................................ 16

By metallography, X-ray diffraction, and X-ray microanalysis methods, the structure transformations

in the surface layer of the powder Al-Cr-Si cathode under the action of a stationary vacuum arc on the

surface of the cathode have been investigated. It is ascertained that arc-induced heating leads to melting

of the cathode surface layer to a depth of 30-80 μm. The surface layer depletion with Al and Si is to be

found due to its selective evaporation from the bath of molten metal.

Keywords: multicomponent cathodes, vacuum arc, selective evaporation.

 

A.Kh. Valeeva, I.Sh. Valeev

Effect of electrolysis parameters on the composition and structure of the electrodeposited alloy Sn-Sb-Cu............................... 24

Effect of surfactant additive, current density and antimony chloride concentration on the chemical

composition and microstructure of the electrodeposited alloy Sn-Sb-Cu has been investigated.

It was shown that the presence of surfactant in the electrolyte allows to obtain a fine-grained alloy

structure with composition like a tin babbit. Depending on concentration of SbCl3 in the electrolyte,

coatings with different microstructures were obtained. Their structures were the solid solution of tin

with precipitations of Cu6Sn5 and Sn3Sb2 phases or the mixture of Cu2Sb and Cu3Sn intermetallides.

From the electrolyte with the surfactant and SbCl3 concentration of 0.0125 M at current density

0.31 mA/dm2, the fine-grained structure of the alloy Sn-Sb-Cu was formed with the phase and chemical

composition similar to that of a tin babbit.

Keywords: electrodeposition, surfactant, babbit.

 

Plasmochemical methods of production and treatment of materials

V.I. Kalita, A.I. Mamaev, V.A. Mamaeva, D.A. Malanin, D.I. Komlev,
A.G. Gnedovets, V.V. Novochadov, V.S. Komlev, A.A. Radyuk

Structure and shear strength of implants with plasma coatings ................................................................................................. 30

Four types of the three-dimensional plasma capillary-porous titanium coatings for model intraosseous

implants were developed. By means of pulsed microplasma oxidation in solutions or plasma spraying

of powders, the additional bioactive coatings on the base of calcium phosphates have been deposited

on the Ti coating surface. Shear strength values of the interface between the implants coated and osseous

block after 16 weeks of implantation are 4,25-4,81 MPa while for implants with additional plasma

hydroxyapatite coating it exceeds 6.19 MPa after 4 weeks of implantation.

Keywords: 3D capillary-porous titanium coatings, plasma spraying, pulse microplasma oxidation
intrabone implants, bioactive coatings.

 

V.M. Gusev, O.Yu. Elagina, V.B. Mordynsky, A.S. Tyuftyaev

An investigation of thermal conductivity of the ceramic plasma coatings sprayed with plated powders .................................... 47

The features of the formation and structure of plasma ceramic coatings sprayed from composite powders of

alumina and zirconia plated with nickel and aluminum. Porosity and thermal conductivity of the coatings, as

well as microhardness of the phase components were measured. It was found that the decrease in thermal

conductivity of the coatings due to reducing the content of the metal phase when the plasmatron arc power

was increased is compensated by its increase owing to coating porosity decreasing. It eliminates the net effect

of the arc power on thermal conductivity of ceramic-metal coatings.

Key words: plasma spraying, plated powders, ceramic coatings, heat conductivity coefficient.

 

A.M. Efremov, A.V. Dunaev, D.B. Murin

Kinetics and mechanisms of GaAs plasma etching in gaseous mixtures
of HCl with Ar, H2 and Cl2 of variable initial composition
....................................................................................................... 52

Effect of the initial composition of gaseous binary mixtures of HCl with Ar, H2 and Cl2 on the kinetics

of GaAs plasma etching under the conditions of DC glow discharge has been investigated. Kinetics of

the etching is found to be controlled by change of the flux density of Cl atoms, and probability of GaAs

interaction with chlorine atoms is dependent on the treated surface temperature and flux density of ions.

Correlation between GaAs etching rate and mean-square surface roughness of treated surface is ascertained.

Keywords: plasma, hydrogen chloride, etching kinetics.

 

New methods of treatment and production of materials
with required properties

V.V. Roshchupkin, M.A. Pokrasin, M.M. Lyakhovitsky, N.A. Minina

Acoustic and acoustic-emission methods of investigation of physical and mechanical properties of materials.......................... 62

An improved method and experimental setup for the study of the acoustic properties (speed and

attenuation coefficient of ultrasonic) in metals and alloys are described. The use of additional data

obtained by dilatometric measurements allows to improve the accuracy of determined acoustic properties

and to calculate the temperature dependencies of the density and Young modulus. Developed hardware

and software for measurements and analysis of acoustic emission data allows to detect an accurate

temperature interval of phase transformations in metals.

Keywords: ultrasonic speed, attenuation coefficient, the relative thermal expansion, density,
Young modulus, acoustic emission.

 

M.I. Alymov, E.V. Evstratov, A.B. Ankudinov, V.A. Zelensky, O.A. Golosova, A.Yu. Kolobova

Preparation, structure and properties of the porous materials based on titanium .................................................................... 70

A method for production of titanium material with a porous surface layer by hydrostatic pressing and

subsequent hightemperature sintering with the using a sugar as a pore-forming agent for a temporary filling

the pores has been proposed. Comparative studies of the structure and properties of titanium materials

produced by a new way and a classic method of powder metallurgy (uniaxial compression + high-temperature

sintering) were carried out. It is shown that the proposed method allows to obtain the porous titanium

samples with the given parameters of the pore space (the volume fraction and pore size) and high mechanical

properties. By means of the proposed method, experimental model of the element of endoprosthesis

(cup for the acetabulum) was fabricated.

Keywords: powder metallurgy, titanium material with a porous surface layer, pore-forming agent,
cap of a hip endoprosthesis.

 

G.A. Dorogina, V.F. Balakirev, E.V. Ignateva, A.V. Dolmatov, O.M. Fedorova, A.B. Shubin

Physical properties of soft magnetic materials sintered from Fe-Si powders crushed in air or alcohol environment................ 76

Comparative investigations of the magnetic and mechanical properties of soft magnetic Fe-Si alloys

sintered from the powder mixtures crushed in air or alcohol environment. Material produced from the

powders crushed in air is found to have better properties. Fe-7% alloy structure analysis shows that

the process of mechanical activation is reduced under the crushing in alcohol due to silicon carbide

formation and decrease of Si concentration in Fe-based solid solution.

Keywords: Fe-Si system, mechanical fragmentation, medium of crashing, magnetic properties, mechanical
properties, mechanical activation, structure.

 

O.P. Fedorov, V.F. Demchenko, I.V. Shuba, .B. Lesnoy

Influence of gravitational and vibrational convection on the heat- and mass transfer in the melt during
crystal growing by Bridgmans and floating zone methods
....................................................................................................... 85

A mathematical simulation of the hydrodynamic and thermal processes during crystal growing by the

Bridgman and floating zone techniques under terrestrial and in microgravity conditions has been carried

out. Features of the hydrodynamic state of the melt under the action of an axial vibration with different

frequency and intensity were studded. It is shown that the floating zone method is less sensitive to

Rayleigh-Taylor instability of liquid phase flow.

Keywords: crystal growth, zone melting, Bridgman technique, hydrodynamics, vibrations, microgravity,
mathematical simulation.

 

Autor′s index 2015....................................................................................................................................................................... 94