Volume 8, Issue 1, February 2018

regular issue 1 2018

A method for the construction of initial atomic models of nanocrystals with extrinsic dislocations in grain boundaries for molecular dynamics simulations is developed. The method is used to determine atomic structures and energies of grain boundaries in columnar f.c.c. nanocrystals with [112] column axis.

A method for the construction of initial structures for molecular dynamics simulations of nanocrystals with nonequilibrium grain boundaries containing extrinsic dislocations

A.A. Nazarov, R.T. Murzaev

PDF editorial's selection Article

Year: 2018

Volume: 8 Issue: 1

Pages: 5-10

Journal section: Theory and computer simulations in materials science and condensed matter physics

The influence of excess free volume in the triple junctions of grain boundaries on their mobility is studied by the molecular dynamics method

Investigation of the influence of excess free volume on the mobility of triple junctions of grain boundaries

D.V. Novoselova, G.M. Poletaev, V.V. Kovalenko

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 11-15

Journal section: Theory and computer simulations in materials science and condensed matter physics

Oscillations of kinetic temperature in harmonic triangular lattice with random initial velocities.

Temperature oscillations in harmonic triangular lattice with random initial velocities

V. Kuzkin, V. Tsaplin

PDF editorial's selection Article

Year: 2018

Volume: 8 Issue: 1

Pages: 16-20

Journal section: Theory and computer simulations in materials science and condensed matter physics

Monte Carlo results of Curie temperatures (TC) and estimated temperatures of the martensitic phase transition (Tm) for Ni2-xPtxMnGa (0 ≤ x ≤ 1,75) alloys as functions of Pt concentration (x)

Complex investigations of phase diagram of Ni-Pt-Mn-Ga Heusler alloys

M. Zagrebin, S. Derevyanko, V. Sokolovskiy, V. Buchelnikov

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 21-26

Journal section: Theory and computer simulations in materials science and condensed matter physics

By numerical modeling the simple approximate dependence of zinc’s damage f(t) from time t and the initial damage f0 under treatment of pulse high-energy electromagnetic field are obtained (С= 1,228*102 s–1, t0= 9,63 μs, are the proportionality coefficient and the threshold time respectively).

Modeling the healing of damage of metal by high-energy pulsed electromagnetic field

K.V. Kukudzhanov

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 27-32

Journal section: Theory and computer simulations in materials science and condensed matter physics

In this paper, we present a method for processing an acoustic emission signal using a discrete wavelet transform. The figure shows an example of an acoustic emission signal and strain hardening curve obtained from an aluminum alloy under tensile loading.

Investigation of plastic deformation of aluminum alloys using wavelet transforms of acoustic emission signals

A. Dmitriev, V. Polyakov, A.A. Lependin

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 33-36

Journal section: Experimental methods in materials research

CCT diagram plotting based on the numerical analysis of dilatometric tests results

I. Teplukhina, V. Golod, A. Tsvetkov

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 37-41

Journal section: Experimental methods in materials research

The microstructure and local mechanical properties of zones of 12Cr18Ni10Ti steel and a titanium alloy VT1-0 with an intermediate copper insert joint were carried out. The stress–strain diagrams for zones of the joint are received using the original technique for determining coefficients of the “stress–strain” diagram.

The laser-welded joint of an austenitic corrosion-resistant steel and a titanium alloy with an intermediate copper insert

I. Veretennikova, N. Pugacheva, E. Smirnova, N. Michurov

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 42-47

Journal section: Experimental methods in materials research

Field neon image atomic clean and atomic smooth the surface of platinum single crystal before irradiation, with the corresponding stereographic projection.

By irradiation of the single crystal Pt beams of charged Ar+ ions are able to obtain nano-structured state of the material under certain modes in the near-surface volume of the nano meter range.

Field ion microscopy of nanoblocks on the surface of metals after irradiation argon ion beams

V.A. Ivchenko

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 48-53

Journal section: Experimental methods in materials research

Metallographic methods were used to study the viscous character of the deformation in the regions of strong localized flow, including Roaldite (Fe, Ni) 4N plates in the alpha (Fi, Ni) meteorite of the Sikhote-Alin meteorite.

Analysis of structural changes and phase transformations in Sikhote-Alin IIAB iron meteorite under various origin shock deformation

R.F. Muftakhetdinova, V.I. Grokhovsky, G.A. Yakovlev

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 54-58

Journal section: Experimental methods in materials research

Review of actuality research on effect of high constant magnetic field on phase and structural transformations are presented. Figure show fragment of phase diagram Fe-C under magnetic field 10 or 18 T.

Effect of high magnetic field on phase and structural transformations in ferromagnetic alloys

V. Milyutin, I. Gervasyeva

PDF Review

Year: 2018

Volume: 8 Issue: 1

Pages: 59-65

Journal section: Materials processing and applications

In electro-technical textured tape, the formation of optimum narrow zones of plastic deformation across the texture axis decrease the size of magnetic domains 3-4 times. This leads to decrease the speed of motion of the domain boundaries and to considerable reduces by 25% of magnetic losses during magnetization reversal of the material.

Optimization by deformation effects of the structure and properties of Fe-Si alloys with different texture

Y.N. Dragoshanskii, V.I. Pudov

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 66-70

Journal section: Materials processing and applications

Hydrogenation leads to the formation of a gradient state in the steel Fe-17Cr-10Mn-7Ni-1V-0.09С-0.65N (wt.%): thin (<15 μm) brittle surface layer is formed on the side surfaces of the samples, which cracks during plastic flow; the central parts of the samples are destroyed in transgranular viscous mode similar to the samples destroyed without hydrogen charging. The thickness of the brittle surface layer increases and the character of the destruction changes with increasing duration of saturation of the samples with hydrogen in tension: from brittle mixed (transgranular and intergranular) after saturation for 8 and 16 hours to fully intergranular for 32-50 hours of hydrogen-charging.

The effect of hydrogen alloying on strain hardening and fracture of a high-nitrogen austenitic steel

E. Astafurova, V. Moskvina, N. Galchenko, E. Melnikov, G. Maier, A. Burlachenko, S. Astafurov, G. Zakharov

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 71-76

Journal section: Mechanical and physical properties of materials

$The transfer of applied mechanical stress from polymer matrix to nanofiller and? Hence, a properties of nanocomposites polymer/carbon nanotubes are defined by structure of aggregates (ring-like formations) of nanofiller, treated within the frameworks of fractal analysis.$

The fractal model of mechanical stress transfer in nanocomposites polyure-thane/carbon nanotubes

G.V. Kozlov, I.V. Dolbin

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 77-80

Journal section: Mechanical and physical properties of materials

The comparative research of wear resistance, hardness and elastic modulus of exemplars from titanic BT6 alloy with the mineral coating created when using the low-temperature technological operations and without coating is conducted. Considering features of measurement of physico-mechanical properties of thin modified layers, measurement of wear resistance was executed by method of a multi-cycle sliding friction by the sapphire sphere with monitoring of force of a clip and deepening of a tip in an exemplar. Creation of a mineral layer increased hardness of a surface of an exemplar from titanic alloy by 45-70%. The wear resistance of the surface of an exemplar modified by minerals increased by 4-5 times in comparison with wear resistance of a surface of titanic BT6 alloy without modification.

Surface hardening of titanium alloy by minerals

A.V. Skazochkin, A.S. Useynov, S.V. Kislov

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 81-87

Journal section: Mechanical and physical properties of materials

$A fracture locus for the 10 vol.% V95/SiC metal matrix composite.$

A fracture locus for a 10 volume-percent B95/SiC metal matrix composite at the near-solidus temperature

D.I. Vichuzhanin, S.V. Smirnov, A.V. Nesterenko, A.S. Igumnov

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 88-93

Journal section: Mechanical and physical properties of materials

At step of deformation from e = 0.5 to e = 4.6, the stage of nucleation of the ω phase is observed only in area of the α-phase, which have a favorable crystallographic orientation. The formation of groups of planar defects in the ω phase is a mechanism for the compensation of elastic stresses during lattice transformation α → ω under conditions of high quasihydrostatic pressure. The figure shows the dark-field image in the reflex (001)ω of the deformed structure at angle of anvil of Bridgman φ=15 grad (e=1.5) of pseudo-single crystal of zirconium

STRUCTURAL-PHASE TRANSFORMATIONS IN THE ZIRCONIUM SINGLE CRYSTAL UNDER THE PRESSURE OF THE DEFORMATION

L. Egorova, Y. Khlebnikova, V. Pilyugin, E. Chernyshev

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 94-99

Journal section: Structure design and analysis

The recrystallization mechanism after ECP was deduced to be similar to that operating during conventional static annealing. The microstructural changes were explained in terms of Joule heating and similar observations for static recrystallization.

Effect of electric-current pulses on structural changes in cold rolled copper at different initial temperatures

I.S. Valeev, A.K. Valeeva

PDF editorial's selection Article

Year: 2018

Volume: 8 Issue: 1

Pages: 100-104

Journal section: Structure design and analysis

Nb rich precipitates of Inconel 718 produced by selective laser melting

R.V. Shakhov, K.S. Mukhtarova

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 105-109

Journal section: Structure design and analysis

Fig 1. The enthalpy release rate under linear heating
TP – quenched samples with supersaturated solid solution
0 – sample in the initial state before ECAP
2 – sample after 2 ECAP pass

Fig. 2. Particles' size distribution on the mesoscale (SEM) in the initial state and after 8 passes of ECAP

Table 1. Changes in the distribution density of particles depending versus their sizes on different stages of processing (TEM)

Dissolution of the second phase particles in the course of the equal channel angular pressing of diluted Cu Cr Zr alloy

I.A. Faizov, R.R. Mulyukov, R.R. Mulyukov, D.A. Aksenov, D.A. Aksenov, S.N. Faizova, N.V. Zemlyakova, N.V. Zemlyakova, K. Cardoso, K. Cardoso, Y. Zeng, Y. Zeng

PDF Article

Year: 2018

Volume: 8 Issue: 1

Pages: 110-114

Journal section: Structure design and analysis

Volume 8, Issue 1, February 2018

A method for the construction of initial structures for molecular dynamics simulations of nanocrystals with nonequilibrium grain boundaries containing extrinsic dislocations

Investigation of the influence of excess free volume on the mobility of triple junctions of grain boundaries

Temperature oscillations in harmonic triangular lattice with random initial velocities

Complex investigations of phase diagram of Ni-Pt-Mn-Ga Heusler alloys

Modeling the healing of damage of metal by high-energy pulsed electromagnetic field

Investigation of plastic deformation of aluminum alloys using wavelet transforms of acoustic emission signals

CCT diagram plotting based on the numerical analysis of dilatometric tests results

The laser-welded joint of an austenitic corrosion-resistant steel and a titanium alloy with an intermediate copper insert

Field ion microscopy of nanoblocks on the surface of metals after irradiation argon ion beams

Analysis of structural changes and phase transformations in Sikhote-Alin IIAB iron meteorite under various origin shock deformation

Effect of high magnetic field on phase and structural transformations in ferromagnetic alloys

Optimization by deformation effects of the structure and properties of Fe-Si alloys with different texture

The effect of hydrogen alloying on strain hardening and fracture of a high-nitrogen austenitic steel

The fractal model of mechanical stress transfer in nanocomposites polyure-thane/carbon nanotubes

Surface hardening of titanium alloy by minerals

A fracture locus for a 10 volume-percent B95/SiC metal matrix composite at the near-solidus temperature

STRUCTURAL-PHASE TRANSFORMATIONS IN THE ZIRCONIUM SINGLE CRYSTAL UNDER THE PRESSURE OF THE DEFORMATION

Effect of electric-current pulses on structural changes in cold rolled copper at different initial temperatures

Nb rich precipitates of Inconel 718 produced by selective laser melting

Dissolution of the second phase particles in the course of the equal channel angular pressing of diluted Cu Cr Zr alloy

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