CONTENTS

 

Effect of energy fluxes on materials

 

V.N. Elkin, T.V. Malinskiy, S.I. Mikolutskiy, R.R. Khasaya, Yu.V. Khomich, V.A. Yamshchikov

Effect of nanosecond laser pulse irradiation on the surface structure of metal alloys ................................................................ 12

Effect of nanosecond pulse irradiation by ArF- and NdYaG-laser on the surface structure of titanium

alloy and stainless steel has been studied. Micro-, submicro-, and nanostructures formation with elements

of conic and round shape is found to be occurred on laser-irradiated surfaces. Optimal quantities of the

laser wavelength, pulse energy density, and number of laser pulses were ascertained for a required

structure formation favourable for the surface with enhanced adhesion.

Keywords: stainless steel, titanium alloy, submicron structures, nanosecond laser irradiation.

 

T.G. Karnavskaya, P.Yu. Kikin, V.N. Perevezentsev, E.E. Rusin

Influence of cyclic laser impulses on degradation of a tantalum coating .................................................................................... 18

Possibility of simulation of the pulsed heat exposure on Ta coating surface by low-energy cyclic laser

irradiation has been considered. In is shown that at sufficiently low time interval between the laser pulses,

the efficiency of laser radiation absorption by the surface is increased permanently due to the surface

temperature rising and Ta2O5 and Ta2O oxides formation. It leads to even more surface temperature

increasing. The laser irradiation regimes are ascertained which result in Ta coating degradation and

fracture after the action of a bulk laser pulse number.

Keywords: coating, laser treatment, surface oxidation.

 

V.A. Shulov, A.N. Gromov, D.A. Teryaev, Yu.A. Perlovich, M.G. Isaenkova, V.A. Fesenko

Texture formation in the surface layer of targets from VT6 alloy

under irradiation with intense pulsed electron beams ................................................................................................................ 24

The texture formed in the surface layer of recrystallized titanium alloy VT6 irradiated with intense pulsed

electron beams (IPEB) in a melting mode has been studied. It was ascertained that irradiation in the melting

mode leads to the formation of compression texture and fine globular-lamellar structure in 20 mm thickness

surface layer with preferred orientation of α-, α′-, and α″-plates in parallel or nearly parallel to the surface.

Structural changes observed in the surface layer are the cause of IPEB-treatment induced improves of fatigue

strength of titanium alloy.

Keywoods: electron beam treatment, compressor blades, transmission electron microscopy, X-ray analysis, texture.

 

S.V. Stefanovsky, I.A. Presnyakov, A.V. Sobolev, M.I. Kadyko, O.I. Stefanovskaya1

Effect of irradiation with accelerated electrons on iron oxidation state

and structure of sodium-aluminum-iron phosphate glasses ........................................................................................................ 41

By means of Fourier transform infrared and Mössbauer spectroscopy, effect of irradiation with 8 MeV

electrons on the structure of anionic motif in the glasses of 40Na2O, (20x)Al2O3, xFe2O3, 40P2O5

series (mol.%) as well as iron oxidation state and coordination environment have been studied. It was found

that irradiation with dose up to 1 MGy has practically no effect on the character of bonds in the anionic

motif of the glasses except possibly minor changes in aluminum coordination state and Fe(III)/Fe(II) ratio.

The fraction of Fe(III) in octahedral oxygen environment is 60-75% of total iron content and does not depend

on irradiation dose up to 1 MGy.

Keywords: accelerated electrons, aluminum, coordination environment, irradiation, iron, oxidation state,

sodium-aluminum-iron phosphate glass.

 

Plasmochemical methods of production and treatment of materials

 

A.S. Demin, E.V. Morozov, S.A. Maslyaev, V.N. Pimenov, V.A. Gribkov, E.V. Demina, I.P. Sasinovskaya,

V.P. Sirotinkin, U.S. Sprygin, G.G. Bondarenko, A.N. Tikhonov , A.I. Gaidar

The influence of a powerful stream of deuterium ions and deuterium plasma on the structure state

of the surface layer of titanium .................................................................................................................................................... 50

Effect of a high-power pulsed flow of deuterium ions and deuterium plasma generated in Plasma Focus setup

on the surface structure of Ti plate has been investigated. It is ascertained that depending on the radiation-thermal

conditions on the surface, three zones with different surface morphology, structure and defects are formed in the

surface layer irradiated. Peculiarities of the surface damages in a center of irradiated range of Ti target exposed

to the most severe irradiation (power density of ion and plasma flows are qi≈1011-1012 and qp≈109-1010 W/cm2

respectively) were studied as well as these for periphery ranges exposed in softer irradiation conditions.

Keywords: pulsed fluxes, deuterium ions, deuterium plasma, Plasma Focus setup, surface damage, structure defects.

 

N.A. Smolanov, V.A. Neverov

Small-angle X-ray scattering investigation of carbon- and titanium-containing nano- and microparticles deposited

from an arc-discharge low-temperature plasma ....................................................................................................................... 56

By small-angle X-ray scattering, the dispersion system of microparticles deposited on the walls of the vacuum

chamber under electroarc sputtering of titanium in a nitrogen and acetylene atmosphere has been studied.

It was found that the particles with the radii of inertia Rg≈8-16 nm make the main contribution to the scattering.

These particles are the massive fractals, i.e. ~5-55 nm in size particles (clusters) with developed porous surface.

Fractal dimension of the particles is D=2.62.

Keywords: arc discharge, dusty plasma, drop fraction, small-angle X-ray scattering, fractal dimension.

 

Functional coatings and surface treatment

 

M.B. Sedelnikova, Yu.P. Sharkeev, E.G. Komarova, T.V. Tolkacheva

Effect of micro-arc oxidation process quality on the formation and properties of wollastoniteand

calcium phosphate based biocoatings ....................................................................................................................................... 63

The structure and properties of calcium phosphate coatings formed on titanium by micro-arc oxidation (MAO)

method were investigated. The MAO process was carried out in electrolyte based on a 30% phosphoric acid

with hydroxyl-apatite and natural wollastonite. Voltage V and duration t of MAO process as well as the pulse

duration t are found to be the basic quantities influencing on the coating surface morphology and properties.

Coatings of 25-30 μm in thick with the surface roughness of Ra=2.5-5.0 μm were formed at V=180 V,

t=5-10 min, and t up to 500 μs. These coatings have a lamellar-porous structure with round-shaped platelets

of calcium phosphate compound and extended particles of wollastonite. Such structure secures the

enhanced strength and biological properties of coatings. Porous coatings of 120 μm in thick with spheroidal

structural elements on the surface are formed at higher (300 V) voltage.

Keywords: microarc oxidation, electro-physical characteristics, physical and mechanical properties,

surface morphology, wollastonite, calcium phosphate coatings.

 

V.N. Arustamov, Kh.B. Ashurov, I.Kh. Khudaykulov, B.R. Kakhramonv

Characterization of white layer formed under vacuum-arc treatment of the steel surface with cathode spots ...................... 69

Under the action on the cathode spots of vacuum-arc discharge, oxide cleaning and decontamination of

a metal surface is occurred as well as the surface layer strengthening and impurities depletion. Local heating

of a micro-region of 2-5 μm in size during a carbon steel cathode spot treatment leads to the phase

transformation with austenite formation and mosaic structure formation with a block size of 0.1-0.2 μm,

and as a consequence induces the white layer appearance on the treated surface.

Keywords: vacuum arc discharge, cathode spots, metal surface treatment, local thermal effects, white layer.

 

A.M. Gashimov, K.B. Gurbanov, R.N. Mekhtizadeh, S.S. Aliev, I.H. Zakieva, M.A. Gasanov

Activation of the surface of clinoptilolite by electrical discharge ................................................................................................ 73

By the method of thermally stimulated current relaxation, the processes of the surface and volume charge

accumulation in solid porous adsorbents (natural clinoptilolite) during their treatment in electrostatic field

or in electric discharge have been investigated. X-ray diffraction shows that the electric treatment leads to

purification of the adsorbent porous skeleton the rom impurities. Charge accumulation and impurities

removal are conductive to the adsorption capacity of clinoptilolite, which makes it a promising application

for wastewater treatment.

Keywords: absorbent, clinoptilolite, corona discharge, thermally stimulated relaxation, charge state.

 

V.B. Mordynsky , V.M. Gusev, A.S. Tyuftyaev, A.G. Buklakov, M.A. Sargsyan

Dispersion of drops under arc spraying ...................................................................................................................................... 81

The conditions of spraying and dispersion of droplets under the coating deposition by arc spraying method

have been analyzed. Effects of air flow and its pressure on the metal spraying pattern were studied experimentally.

Due to the batch manner of liquid electrode metal deposition on the surface, a specific wave relief (ripple) is

formed on the substrate surface, and it leads to changes in the arc length. As a result, periodic growth and

fragmentation of drops takes place to the extent of drops pick-up by air flow. Influence of gas-dynamic forces

is significant at drops moving off from the surface and following acceleration of liquid droplets in the stream.

The particle velocity under arc spraying is depending on the type of spraying devices, pressure and air flow rate

and varies in the range of 70-100 m/s.

Keywords: sputtering, arc spraying, dispersion of metals, total head pressure, two-phase stream.

 

T.R. Chueva, V.V. Molokanov, P.P. Umnov, N.V. Umnova

Application of thermal analysis technique for development of technology of melt preparation to obtain a thick

amorphous Co-alloy microwires .......................................................... ...................................................................................... 89

Thermal analysis technique of estimation of the melt overcooling ability is used for determination of the optimum

technological regimes of melt preparation over the whole stages of production of amorphous wires. The temperature

range of the high temperature homogenization of melt, precursor suction regime, and precursor melting regime were

ascertained for model Co69Fe4Cr4Si12B11 alloy. With the use of heat treatment regimes determined, the precursor

melting was conducted and the samples of high-ductile amorphous microwires with a diameter up to 200 mm were

produced by Ulitovsky-Taylor method.

Keywords: overcooling, amorphous microwire, heat treatment, precursor.

 

Autors index ................................................................................................................................................................................. 90

 

In memory to prof. I.S. Tashlykov ................................................................................................................................................ 96