Contents

Effect of energy fluxes on materials

V.I.Vysotskii, A.O.Vasilenko, V.B.Vassilenko, M.V.Vysotskii

Non-equilibrium heat effects in conducting medium influenced by pulsed impact......................................................................... 5

Two-temperature model for a medium with electron gas taking into account a local non-equilibrium heat
transfer processes has been considered. It is shown that appearing the continuous heat waves as well as
the tailing of the heat zone boundaries is possible due to a small duration of the impact heat pulses.

The temperature conditions necessary for realization of these effects have been estimated quantitatively.

Keywords: materials treatment, short laser pulses, metal, plasma, heat transfer, nonequilibrium heat transfer.

 

V.A.Shulov, V.I.Engelko, A.N.Gromov, D.A.Teryaev, O.A.Bytsenko, G.G.Shirvanyants

Structure and phase changes in the surface layers of the parts from titanium alloy irradiated
with the power pulsed electron beam........................................................................................................................................... 12

Experimental data on the effect of pulsed power electron-beam irradiation on physicochemical state
of the surface layers of the blades of gas-turbine engine made from heat-resisting
a+b-titanium alloy
have been analyzed. The structure of irradiated blades was investigated with the help of TEM.

Keywords: titanium alloys, power pulsed electron beams, irradiation, structure of the surface layers.

 

N.V.Alekseev, A.V.Vodopyanov, I.V.Izotov, A.V.Samokhin, M.A.Sinaisky, Yu.V.Tsvetkov

Tungsten trioxide evaporation-condensation process under gyrotron 24 GHz electromagmetic irradiation............................. 17

Using an evaporationcondensation process at atmospheric pressure under the action of gyrotron
microwave (2.4 GGz) radiation, tungsten trioxide powders were produced. By XRD, thermal nitrogen
desorption, laser diffraction, and SEM, the phase composition, morphology, and size distribution of
the powder particles have been studied.

Keywords: tungsten trioxide powder, evaporationcondensation process, microwave radiation, gyrotron.

 

Plasmochemical methods of production and treatment of materials

A.V.Ershov, O.G.Bykovsky, A.N.Lapteva

Influence of exothermic reactions on thermodynamic data of the process of plasma sputtering
of metal conducting wires............................................................................................................................................................ 21

The heat balance of the water calorimeter absorbing energy of the plasma jet with sprayed metal
particles (Al, Cu, Fe, powder steel, bronze) has been analyzed. It was established that in all cases
the temperature of the air-plasma jet with sprayed particles reaches the boiling point of the metal,
part of which passes into the vapor state. As a result of the exothermic reaction of Al oxidation in
air-plasma flow, energy of the plasma jet is increased in 2 times and increase by ~20% at spraying
the powder steel wire. It has been shown that 17-25% of the plasma-sprayed metal is in evaporated
(atomized) or oxidized (burned-out) state.

Keywords: plasma jet, heat balance, calorimeter, exothermic reaction, heat power, metal heating
efficiency, metal burn-out.

 

A.G.Rakoch, T.G.Avanesyan, Yu.A.Pustov, D.M.Strekalina, A.A.Gladkova

Plasma-electrolytic oxidation induced increase of the heat resistance of the alloys on the base
of
g-TiAl and a2-Ti3Al.................................................................................................................................................................. 25

Efficiency of a plasma electrolytic oxidation (PEO) as a way for increasing the heat resistance
and thermal-shock stability of the alloys on the base of titanium aluminides has been studied.
Heat resistance of the coatings produced from these alloys is investigated. The mechanisms
of a high-temperature oxidation of studied alloys both in initial conditions and after PEO
are proposed.

Keywords: alloys on the base of titanium aluminides, plasma-electrolytic oxidation (PEO),
heat resistance and thermal-shock stability, high-temperature oxidation mechanisms.

 

Functional coatings and surface treatment

O.G.Bobrovich, O.M.Mikhalkovich, I.S.Tashlykov

Composition and morphology of Ti and W coatings deposited on silicon during ion-beam assistance...................................... 31

By RBS, TEM, SEM and scanning probe microscopy, the composition and structure of Ti, W
coatings deposited on (111)Si substrate in the condition of ion (Ti
+, W+) assisting have been
investigated. The layers containing TiSi, TiSi
2 silicides and TiC, TiO2 carbides and oxides were
detected in the structure of Ti coatings as well as the layer with the clusters of W
3Si, W5Si3,
WSi
2 silicides and WO2 oxide were observed in W coatings. Ion-assisted deposition of metal
coatings also leads to the amorphous layer formation on the Si substrate surface. Thickness of
the coatings are
increased with the decrease of accelerating voltage of assisting ions from 15 to 5 kV.

Keywords: Si, Ti and W coatings, elemental composition, surface structure.

 

G.A.Pribytkov, V.V.Korzhova, V.A.Bogomolov, P.B.Grinberg

Coatings deposited by vacuum-arc evaporation of Al-Cr and Al-Cr-Si powder cathodes in different
gaseous media............................................................................................................................................................................. 37

Effects of the chemical composition of a reactive gaseous medium on the surface roughness,
microstructure, elemental and phase composition, and hardness of coatings deposited by vacuum
arc evaporation of powder Al-Cr and Al-Cr-Si cathodes have been investigated. Significant influence
of the values of a pressure in the vacuum chamber and atomic mass of the gas components on the
composition, structure, and properties of the deposited coatings.

Keywords: multicomponent cathodes, vacuum arc, reactive gases, amorphization.

 

V.V.Revazov, A.A.Konarev, V.S.Kruglov

Elecrodeposition of copper coating on stainless steel substrate in the process of production
of second-generation HTSC tapes............................................................................................................................................... 45

The possibility of electrolytic plating of copper layer on the stainless steel tape, simulated the HTS
wire, with a nickel sublayer deposited on the steel surface pre-activated by the cathode treatment
with solutions of hydrochloric acid.

Keywords: HTS-tape, stainless steel, the surface activation, adhesion, current efficiency.

 

V.N.Klimov, I.Yu.Sapronov, E.V.Shelekhov

Alphanizing of the titanium alloy during thermocyclic treatment................................................................................................. 50

Effect of the cycling heat treatment on oxygen diffusion in the wrought Ti alloy and commercially
pure Ti has been studied. Enhancement of oxygen diffusion is shown to be induced by
ab polymorphic
transformation in the process of cycling heat treatment. Formation of HCP-superstructure was detected
in the oxygen rich near the surface thin layer in the alloy.

Keywords: titanium alloys, diffusion enhancement, cycling heat treatment, HCP superstructure
Ti
3AlOx, Auger spectroscopy.

 

Composite materials

O.K.Lepakova, N.I.Afanasyev, V.D.Kitler

Nonisothermic synthesis of nanolaminated compounds.............................................................................................................. 58

Nonisothermic synthesis mode, phase composition, and microstructure of SHS materials on the base
of Ti
3SiC2 and Nb2AlC MAX-phases have been investigated.

Keywords: self-propagating high-temperature syntheses, structure, MAX-phases.

 

New methods of treatment and production of materials
with required properties

N.N.Andrianova, N.Yu.Beilina, A.M.Borisov, V.G.Vostrikov, E.S.Mashkova,
D.V.Petrov, N.V.Tkachenko, D.N.Chernenko, N.M.Chernenko

An investigation of the structure of carbon-ceramic composite by means of electron microscopy
and nuclear backscattering spectrometry methods...................................................................................................................... 62

The structure and composition of carbon-ceramic composite FEBUS reinforced with carbon fibres
on the base of viscose as well as that of its precursors have been studied with the help of the methods
of scanning electron microscopy with EDA-technique and nuclear backscattering spectrometry of 7.5
MeV proton
. It is shown that the impregnation of the composite precursor by Si (up to ~30 at.%)
practically does not lead to siliconizing of the reinforcing fibres. Taking into account the stoichiometry
of SiC, share carbide component in the composite reaches ~40%, the remaining ~60% is carbon component.

Keywords: carbon-ceramic composite, carbon fibre, silicon carbide, scanning electron microscopy,
energy-dispersion analysis (EDA), nuclear backscattering spectrometry.

 

Yu.A.Perlovich, M.G.Isaenkova, P.N.Medvedev, V.A.Fesenko, Soe San Thu

Mechanisms of the texture influence on the corrosion behavior of Zr-alloy shell tubes.............................................................. 67

Different mechanisms of crystallographic texture influence on the corrosion behavior of commercial
shell tubes from Zr-based alloys under exploitation conditions have been considered. Dependence of
the tube corrosion properties on recrystallization degree is found to be correlated with distribution of
prismatic axes in tube texture which can be regarded as an indicator of the tube propensity for intergranular
oxygen diffusion. Effect of a layerwise inhomogeneity of the tube texture on the tensile stresses occurrence
in the surface layers is studied. It is shown that tensile stresses enhances an oxygen diffusion into internal
layers of the tube. Under the action of tensile stresses in the surface layer arising during oxides formation,
twinning of
a-Zr matrix takes place near the front of oxidation. Texture of oxide layer¢s monoclinic phas
is stable under the tube surface treatment due to existence of the orientation relationship with the substrate.

Keywords: Zr-based alloys, shell tube, crystallographic texture, oxidation, oxide layer.

 

P.I.Malenko

Reasoning of the selection of optimal temperature-time mode of carbonitriding of alloyed structural steel................................ 77

An empirical dependence of the depth of the layer saturated with N and C on the treatment mode parameters
such as temperature, saturation time, and gaseous medium composition, has been determined for carbonitriding
treatment of a low-alloyed structural steel. An optimal mode of the treatment was ascertained for obtain the
maximum value of the diffusion zone depth equal 231 mm.

Keywords: structural steel, alloying elements, carbonitriding process, white carbonitride layer, diffusion zone.