Том 12, Выпуск 3, Сентябрь 2022

The chemical composition and adjustment of pH value of the simulated body fluid exert a significant effect on the susceptibility of the alloy ZK60 to stress corrosion cracking

The transmission of ultrasound vibrations during welding leads to changes in the welding zone. The microstructure has a significantly reduced width of the dendritic zone than in the reference specimen.

Thermoelectric materials are designed according to thermoelectric characteristics, which require good agreement with the Zeebeck coefficient, electronic conductivity, and thermal conductivity. This paper is presented the comparative data of thermal properties in five compounds of nanocrystalline copper sulfides KxCu1.85S (0<x <0.05) at the temperature zone from 300 K to 700 K. X-ray phase analysis shows a mixture different phases of copper sulfides such as Сu1.85S cubic phase, Cu2S cubic phase, Cu17S9 (Cu1.89S) rhombohedral phase, Cu2S tetragonal phase in all investigated compounds at room temperature. The sizes of crystallites in the alloys estimated from half-width of X-ray lines are in range from 24 to 90 nm. The thermal conductivity of alloys decreases to 0.2 ÷ 0.6 W K-1m-1 in temperature range of 350 – 700 K due to increasing of the amount of potassium (for x = 0.04, 0.05). This guides the maximum thermoelectric characteristics of the material. The obtained results are important for semiconductor materials used in the field of thermoelectric devices.

The formation of CaAl12O19 platelets in sintered Al2O3-ceramics leads to the increase in fracture toughness by 48% (up to 5.2±0.4 MPa*m1/2).

Typical view of the "Torque - angle of twist" diagrams during the torsion test of specimens with a diameter of 3 mm made from magnesium alloy Mg-Zn-Ca after annealing (1) and after ECAP (2)

the studies carried out show that by varying the nature of the solvent, the concentration and nature of the polymers in the initial solutions, it is possible to control the structure formation in mixed polymer solutions, and, therefore, the properties of the resulting composites.

The figure shows a model used in a model experiment to study the interaction of modified boron-containing nanotubes with a carbon dioxide molecule

Crack and debris on friction surface of babbitt B83 at hard wear mode

SEM image of hybrid five-layered composite based on steel and aluminium alloy with interlayers of basalt fiber-reinforced polymer.

Terbium oxide nanopowder with an average particle size of 13 nm and a record high content of magnetoactive Tb3+ ions was successfully synthesized for the first time by laser ablation of solid target in Ar gas flow

The energy dispersive analysis showed an increase in the chromium concentration in the coating with an increase in the chromium oxide content in the electrode materials. With an increase in the concentration of Cr2O3 in the coatings, the friction coefficient and wear rate were decreased.

General view of the equivalent strain distribution diagrams in the sample during MIF at three steps at 950, 900 and 850°C.

The mechanism of formation of the cellular crystallization structure consists in the occurrence of combined thermocapillary, concentration-capillary, evaporative-capillary and thermoelectric instability

Friction stir processing mode (ω = 2000 rpm, ν = 8 mm/min) and hardening T6 heat treatment were developed, which makes it possible to achieve the formation of a monolithic defect-free structure in the AK12D (Al–12.8Si–1.67Cu–1.03Ni–0.84Mg–0.33Mn–0.23Co–0.24Fe) alloy with a high level of mechanical properties.

The method of confocal laser scanning microscopy (CLSM) has demonstrated significantly higher sensitivity for assessing of corrosion damages than standard gravimetric method. Moreover, the CLSM method has enabled to obtain the quantitative assessment of average corrosion rate, as well as localized one.