Volume 10, Issue 3, August 2020

Limitation of the heating temperature for hot plastic deformation on the basis of studies of the temperature of phase transformation of austenite into δ-ferrite (Ac4).

Laser induced periodic surface strictures (LIPSS) formed on titanium alloy VT6 (Ti6Al4V) surfaces after irradiation with fs-laser pulses (320 fs, 1030 nm)

A feature of the bainitic structure formed upon slow continuous cooling of chromium-nickel-molybdenum steels containing 0.1-0.15% C is the complete absence of precipitates of the carbide phase. It has been shown that carbide-free bainite in such steels is a two-phase ferrite-austenitic structure and, at almost the same level of strength, has a higher level of toughness than steel with bainite containing carbide precipitates.

When fluorinating 4-6-12 graphene layers two stable polymorphic varieties of fluorographene layers T1- or T3-type can be formed

It is shown that the collective effects of the influence of the presence of thin magnetic layers (with a reduced value of the magnetic anisotropy constant) in a five-layer ferromagnet on the dynamics of domain walls is preserved at the action of an external magnetic field, whereas when a DW moves along inertia almost completely disappear. Chart of possible scenarios of DW dynamics depending on its initial velocity and the distance between two thin layers.

Model potential for evaluating the transparency coefficient during tunneling of an electron with energy E through the Coulomb barrier of the target electron (r0 ~ 10-15 m, r1 >> r0)

Dependence of magnetization magnetic field for films on temperature

An original algorithm for constructing full-atomic models of X- and T-shaped seamless junctions between single-walled carbon nanotubes of various chiralities is proposed and its software implementation in the SeamMaker package is implemented.

The Letter presents a detailed analysis of the isomerization and decomposition mechanisms of silabiprismanes. Their thermokinetic parameters in the Arrhenius law are determined, and estimations of their lifetimes at various temperatures are given.

Change in surface morphology as a result of irradiation of the surface with UV radiation

Relative intensities of UV-Vis spectra of silicon biprismanes strongly depend on doping. In particular, doping with methyl radicals and fluorine atoms provides prevalent adsorption intensities of octagonal and hexagonal biprismanes, respectively.

The formation of free volume in grain boundaries and triple junctions during crystallization using nickel as an example is studied by the molecular dynamics method

The fracture surface consisting of two parts featuring by low-temperature cleavage and hydrogen-assisted quasi-cleavage facets has been obtained. It is shown that the average misorientation angle of quasi-cleavage facets is 1.5 times lower than that of the cleavage ones.

The figure shows the true stresses versus the true strains of the Zr-1% Nb alloy under tension at high strain rates. The inhomogeneous fields of equivalent strains obtained by computer simulation of high velocity tension of specimens have good agreement with experimental data.

Dependences of the eddy current device readings α at different frequencies on the number of loading cycles N, measured within contact spots after contact fatigue tests of the cobalt-nickel-chromium PG-10K-01 coating

Adding an intermediate layer between the surfaces to be welded provides better quality of ultrasonic welding.

A stress-strain state computer simulation of samples imitating bimetallic «disk-shaft» type parts for a gas turbine engine from dissimilar heat-resistant nickel-based superalloys during pressure welding with a shear was carried out. Two shaft motion schemes were considered: the shaft into the disk introduction, and the combination of the introduction and rotation of the shaft. It has been established that to obtain solid phase joint between the shaft and the disk, it is preferred to use pressure welding when the introduction and rotation of the shaft.

Percolation effects are considered in the model of a one-dimensional Ising magnet of finite nanometer size with boundary conditions - dangling ends.

The summary energy expenditures for deformation of specimens of pipe steel of strength class X80 were determined basing on experimentally measured geometry of the 3D images of fractured specimens.

Impact loading diagrams of layered samples

Pressure-strain curves for Ni-graphene systems under hydrostatic tension at 0 K and corresponding snapshots of composite at different strain. Ni atoms are shown by blue and C atoms are shown by red.