Volume 11, Issue 2, May 2021

Distribution of temperature, effective strain, displacement of material points and microhardness shows that a 2.0-mm-length pin is preferable for friction stir processing of 2024 aluminum alloy sheet.

Corrosion-aggressive environment (sea water) repeatedly (from 2.5 to 9.5 times) reduces the durability of ropes. The lubricants L8 and L7 provided maximum rope endurance in normal conditions, but in seawater exposure trials showed the worst results.

Displacement of the ferromagnetic film hysteresis loop when the system is heated.

It shows the wear behavior of three different orientations (a) Basal, (b) Prismatic, and (c) Pyramidal for the AZ91 magnesium alloy.

SEM images of obtained (co)polymers samples and installation for measuring of thin film sensors conductivity as a function of air humidity.

In this work, models of a monolayer of pyrolyzed polyacrylonitrile containing pairs of metal atoms have been created. A complete optimization of the cluster geometry was carried out using the DFT method.

Fuel cells are the most efficient means to directly convert stored chemical energy to usable electrical energy. Doped ceria is considered to be a promising electrolyte for intermediate temperature operation.

The resulting model of the hysteresis loop provides a sufficiently high-quality approximation of the values of magnetic induction with an error not exceeding the measurement error, and its application doesn't require complex calculations or the development of a special computer program.

The reproduced exothermic effect in the temperature range 487-653K and endothermic at 1269K (1285K) for CaCu3-3хNi3хTi4O12(CaCu3Ti4-4хNi4хO12-δ) are observed on the DSC curves of the synthesized samples of both series, associated with thermal dissociation of CuO impurities.

Content increasing of nickel up to 20-25 % and molybdenum alloying, leads to a decrease of the peak strain values level during forging in the temperature range 900 - 1200 ° С at the 0,1 s-1 deformation rate

The coating structure obtained by electrospark treatment of titanium alloy Ti6Al4V in a mixture of titanium granules and tungsten carbide powder is represented by accumulations of WC particles in a titanium matrix. The WC accumulations were formed as a result of the ingress of large agglomerates of tungsten carbide powder particles into the discharge region.

Allocation of intermetallic phases in the material. Friction track and example of data recording of friction coefficient change.

The use of such lubricant SM6 (L6) in the manufacture of rope increases the durability of the rope at positive temperatures in relation to the unsmained rope by 2.2 times, and at a temperature of 60 degrees C the durability of the rope, soaked in this lubricant, lower than the unsubstuded (dry) rope.

Median –0.0011, average –0.0010, max. 0.2135, min. –0.1775, standard deviation 0.0705.

The structural-phase state and durometric characteristics of hypersonic metallization coatings made of falsely alloys "Fe-Al" in the initial state and after heat treatment was investigated. The heat treatment consisted in heating the coating samples to temperatures of 570, 620, 720, 820 and 920 °C, followed by holding for 5, 10 and 20 minutes and air cooling.

The dependence of the melting temperature of Ti and TiAl nanoparticles on their diameter in vacuum and in Al matrix is studied by the method of molecular dynamics

Preliminary deformation leads to an increase in the recovery stress only at a stiffness, at which the recovery stresses was close to the value of the yield stress in non-deformed specimens.

Schematic representation of Fe-Rh/PVDF polymer composite fabrication.

The nonmonotonic change in the properties of the alloy of the Cu-Cr-Zr system under SPD conditions is due to the peculiarity of the kinetics of precipitation-dissolution of particles of the second phases and the formation of a solid solution. This process is caused not only by diffusion but also by an additional SPD factor, which promotes particle size reduction.

The strain rate significantly influence on the functional properties of the NiTi alloy. In some cases, the shape recovery curves during thermocycling are completely different.