Contents

Effect of energy fluxes on materials

S.S.Milkin, A.V.Starodubov, S.V.German, G.G.Akchurin, D.A.Gorin, S.B.Venig, Yu.A.Kalinin

Heating of magnetite hydrosol by microwave radiation with different frequencies....................................................................... 5

Efficiency of interaction of microwave-range (7-12 Ghz) electromagnetic radiation with magnetite hydrosol
has been studied experimentally. By means of finite-element method computer simulation, an optimal distance
between the open end of microwave waveguide and the ditch with irradiated liquid was calculated. It is
ascertained that the temperature of magnetite colloid solution after 33 dBm (~2 W) microwave irradiation
within 10 min differs from that of distillate water irradiated under the same conditions not more than 3C.

Keywords: microwave heating, magnetite colloids, computer simulation.

 

Plasmochemical methods of production and treatment of materials

V.A.Shelestova, S.F.Zhandarov, S.G.Danchenko, P.N.Grakovich

Surface modification of carbon fibers by fluoropolymer in a low-temperature plasma.............................................................. 12

Chemical composition, structure, and properties of fluoropolymer coatings produced by a low-temperature
plasma polymerization have been investigated. Peculiarities of the coating deposition onto single carbon
fibers and carbon cloth were considered. It is shown that these coatings improve adhesive interaction
between carbon fibers and poly(tetrafluoroethylene) under composite materials production.

Keywords: plasma, fluoropolymer coatings, carbon fibers, plasma polymerization, surface modification,
wettability, surface energy, polytetrafluoroethylene, composite material.

 

Functional coatings and surface treatment

V.K.Belov, D.O.Begletsov

Simulation of the process of surface microtopography formation under electrospark discharge machining............................. 20

Mathematical model of the surface microtopography formation under electrosparking has been presented.
An initial plane surface relief formation (texturing) is described as a result of the penetration of defined
form paraboloids simulative the craters which are formed during the surface burn out by electric discharge.
Calculated dependencies of the parameters characterizing the surface topography, its roughness, and fractal
properties on the duration and mode of the treatment are in agreement with experimental data.

Keywords: surface microtopography, roughness, electrospark machining, surface texturing, simulation.

 

G.V.Potyomkin, V.V.Demidenko, Ye.P.Nayden, Yu.P.Egorov, M.V.Zhuravlyov, G.E.Remnyov

Structure and phase composition changes in vacuum-arc cathode spot heat-affected zones in plain steel................................. 28

Structural-phase changes in plain steel caused by the action of low-pressure arc in a heat-affected zones
have been investigated by means of X-ray diffraction, optical, and scanning electron microscopy with
energy-dispersive X-ray spectroscopy. Formation of modified layer up to 100 m in depth with modified
microstructure and increased microhardness is ascertained.

Keywords: heat influence, troostite, microhardness, structure and phase transformations, low-pressure
arc discharge.

 

Composite materials

R.S.Mikheev, N.V.Kobernik, V.V.Kovalyov

Production of wear-resistant surface structures with the use of composite materials................................................................. 35

By argon-arc welding method with the use of the composite rods from cast aluminum alloys reinforced
with SiC particles (14 and 40 mm in diameter) as a adding material, wear-resistant composite coatings
have been produced. The wear tests in the conditions of dry sliding show that tribotechnical properties
of the weld composite material is none the worse than those of the cast composite ones of the same
composition.

Keywords: composite welding pool flowing, filler composite rod, argon-arc welding.

 

A.V.Krokhalyov, V.O.Kharlamov, S.V.Kuzmin, V.I.Lysak

Production of hard alloys on the base of chromium carbide by explosive compaction of powders............................................. 46

The basic laws of compaction of carbide chromium and metal (Ti, Cr, Cu) binder powder mixtures as well
as peculiarities of carbide and metallic phases interaction have been studied. Pore-free hard alloys on the
base of carbide chromium is found can be produced by the powder explosive compaction method without
sintering in the case of a correct selection of the binder metal and an optimal conditions of the shock loading.
By the method of optical, scanning, and transmission electron microscopy, the structure and composition of
the hard alloys obtained were investigated.

Keywords: explosive compaction of powders, hard alloys, pressure welding, solid-phase carbide-metal joining,
interphase interaction.

 

New methods of treatment and production of materials
with required properties

V.G.Shepelevich, L.P.Shcherbachenko

Microstructure and microhardness of rapidly solidified foils of In-56 at.% Bi eutectic alloy...................................................... 52

Morphology, phase composition, grain structure, microhardness, and thermal stability of the foils of rapidly
solidified In-56 at.% Bi eutectic alloy have been investigated. The structure of the foils is found to be composed
of microcrystalline InBi phase and Bi disperse precipitations with () and (101) texture respectively. Stabilization
of microcrystalline structure and microhardness values is occurred in the course of two days at a room temperature.

Keywords: bismuth, indium, eutectic alloy, texture, high-speed solidification, microhardness.

 

V.A.Ermishkin, N.L.Fedotova, N.A.Minina, E.Yu.Kireeva, I.A.Korms

To the question on the fracture mechanism of amorphous alloy on the base of Zn-Cu system................................................... 59

Actual conceptions about the micromechanisms of plastic deformation of amorphous and nanostructured
materials are presented. On the example of deformation of Zr-Cu amorphous alloys, it is shown that a load
failures
on the stage of elastic deformation follows to stress-induced phase transition. Intensification of this
transition is observed in the area of plastic zone in the head of a growing crack. On the basis of the obtained
results and literature data, a qualitative model of the development of plastic deformation in amorphous materials
has been proposed.

Keywords: defects, amorphization, phase transformations, structure changes, mechanisms of deformation, free volume, vacancies, dislocations.

 

S.V.Kalashnikov, A.V.Nomoyev, E.L.Dzidziguri

Using the method of inverse Chladni figures for size separation of particles............................................................................. 68

By means of Chladnis inverse figures on a surface of a fluctuating plate and a surface of a piezoelement
nanopowders of dioxide of silicon with various distributions by the sizes are received. The analysis of
distributions is provided by methods of electronic and probe microscopy. Possibility of rather effective
division of nanopowders by this method in the liquid environment is shown.

Keywords: electron accelerator, nanoparticles, size distribution, Chladnis figures, fractionation,
ultrasound, separation.

 

K.S.Filippov, V.T.Burtsev, V.V.Sidorov, V.E.Rigin

An investigation of the surface tension and density of Ni melts with Si impurity.......................................................................... 74

By the constrained drop method, the temperature dependence of the surface tension and density values
of model Ni-(0.05-0.3) Si (wt.%) melts have been investigated. Increase of Si content above 0.2 wt.%
leads to increase both the surface tension and density of the melts, temperature rising decreased the
properties values. Temperature hysteresis of the properties takes place in pure Ni melt while Si addition
depresses the hysteresis progress. It is evidence of homogenization of Ni-Si metal melt.

Keywords: melt, nickel, impurities, silicon, density, surface tension.

 

G.V.Shlyakhova, S.A.Barannikova, L.B.Zuev

Study of the structure of component parts of manufacturing superconducting cable.................................................................. 80

With the help of AFM, SEM, TEM, and optical microscopy methods, evolution of the structure of
superconducting cable on the base of Nb+47% Ti alloy has been investigated on the intermediate
stage of cold drawing deformation. Microstructure, phase composition, and properties of
superconducting Nb-Ti alloy after cold drawing and annealing were studied. Zones of plastic deformation
localization in the places of superconducting fibers breakdown were observed. Changes of the form and
chemical composition of Nb-Ti fibers are found to be occurred in defect-free and cable breakdown zones.
In the places of Nb-Ti fibers breakdown, Nb diffusion barrier around the fibers is absent partially.

Keywords: superconductors, defects, microstructure, localization of plastic deformation, cold drawing.

 

I.I.Novikov , V.V.Roshchupkin, M.M.Lyakhovitsky, M.A.Pokrasin,
N.A.Minina, A.I.Chernov, N.L.Sobol, S.A.Klimenko, A.G.Koltsov

The acoustic properties of fast cutting R6M5 steel...................................................................................................................... 89

The results of an experimental study of acoustic properties (speed and attenuation factor of ultrasound)
as well as relative temperature expansion of fast cutting steel are obtained in a temperature range 20-1100C.
Approximating equations for temperature dependencies of measured and calculated thermophysical and
mechanical properties of the steel were determined by the least square technique.

Keywords: steel, speed of ultrasound, attenuation factor, thermal expansion, Youngs modulus.