Papers accepted for publication

Typical TEM structures of pre-quenched 1420-type alloys after HPT (RT, 4 revolutions, P=6GPa)  and further annealing

Effect of initial condition on nanostructuring and strengthening of age-hardenable aluminum alloys under severe plastic deformation

M. Markushev, E. Avtokratova, O. Sitdikov
Journal section: Structure design and analysis
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
Effects of severe plastic deformation by isothermal сryorolling at a temperature of liquid nitrogen with a strain of e~2 and subsequent natural and artificial aging on the evolution of structure, hardness and resistance to intergranular corrosion (IGC) of the preliminary quenched D16 aluminum alloys of conventional and Zr modified compositions, were investigated. It was concluded that the main factors, determining the alloy microstructure changes, mechanical and corrosion behavior, are the volume fraction and morphology, and spatial distribution of second phases - excess phases and precipitates.

Structure, Hardness and Intergranular Corrosion of Cryorolled and Aged D16 Aluminum Alloy

M. Markushev, S. Krymskiy, R. Ilyasov, E. Avtokratova, A. Khazgalieva, O. Sitdikov
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
Journal section: Structure design and analysis
Many questions remain open in the understanding the role of microstructural factors in the acoustic emission (AE) phenomenon occurring in deforming materials. A comparative analysis of AE time parameters in tensile testing of pure aluminum, copper, silver and nickel specimens having very different values of stacking fault energy (SFE) was undertaken in the present work to clarify the SFE effect on the AE signal. Continuous digital wideband recording was used for AE waveform registration, which offers the possibility to avoid the threshold discriminators and to analyze a continuous AE signal generated during plastic deformation mediated by dislocation mechanisms. The power of the AE signal were selected as the descriptive parameters. Following the evolution of dislocation structures, the AE energy parameters were demonstrated to have a similar behavior in all investigated materials, i.e. the AE level increases sharply at the onset of plastic flow and then decays gradually during the uniform strain hardening stage. However, the absolute values of the AE amplitude and energy differ significantly depending on SFE. It was shown unambiguously that in contrast to expectations, the AE energy parameters reduce as the SFE value increases. This effect is discussed qualitatively in terms of the features of dislocation behavior, which are governed by the SFE value.

The effect of stacking fault energy on acoustic emission in pure metals with face-centered crystal lattice

A. Danyuk, D. Merson, I. Yasnikov, E. Agletdinov, M. Afanasyev, A. Vinogradov
Growth of seeds grains in superconducting ceramics Y123. The seed grown zone contains high density of low-angle boundaries and captured pores.

Microstructure of superconducting ceramics YBa2Cu3O7-x sintered with addition of seed grains

M.F. Imayev, D.B. Kabirova, R.R. Yakshibayeva
Journal section: Structure design and analysis
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
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
Journal section: Structure design and analysis
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
The influence of the microstructure, its heterogeneity, grain size and distribution of secondary phases on the corrosion rate is demonstrated. The microstructure refinement by the severe plastic deformation leading to the increasing fraction of grain boundaries, promotes the formation of a reasonably uniform protective layer, reduces the inhomogeneity of the second phases and increases the overall corrosion resistance of the ZK60 alloy.

On the corrosion of magnesium alloys after severe plastic deformation

D. Merson, E. Vasilev, M. Markushev, A. Vinogradov
According to molecular dynamics simulations the silicon alloying the tetrahegonal distortion of steel martensite.

Silicon impact on carbon ordering at the martensite lattice: molecular dynamics simulations

P.V. Chirkov, A.A. Mirzoev, D.A. Mirzaev
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