Volume 11, Issue 4, December 2021

We studied the structure, phase composition, and mechanical properties of the FeCrMnNiCo0.85C0.15 alloy in the cast and annealed (at 1200°C, 1 h) states, as well as after multistage thermomechanical treatments, including high-temperature annealing, hot forging, and cold rolling. Thermomechanical treatments do not provide the formation of a single-phase austenitic structure, but contribute to a significant dissolution of carbides and an increase in the solid solution hardening of the austenite phase. Such alloys have significantly higher strength and ductility values in comparison with cast alloy and Cantor alloy.

Thermal analysis (red curve, DSC) and the microhardness (HV) of nanostructured Invar 36 alloy (blue curve) as the function of the annealing temperature.

From the interpretation of the obtained XPS- and NEXAFS 2p-spectra of atoms in Co-doped CaCu3Ti4O12 and the corresponding oxides it was concluded that in ceramics the copper and calcium atoms have a charge state of +2, the titanium atoms have a slightly lower charge than +4, and cobalt atoms have mainly a charge of +2 with some fraction of Co(III) ions in the high spin state.

Method for determining energetically favorable landing sites of carboxyl groups during functionalization of graphene nanomesh by atomic charge distribution

Tensile machine and the results of the materials elastic modulus measurements and elongation at break

Under shock-wave loading at a speed of 471 m / s at 20 °C, a phase hammer hardening of austenite is observed as a result of cyclic γ → ε → γ transformation, which manifests in the form of an increased dislocation density (2 × 1010 cm-2) at the site of former ε-martensite crystals.

The phase transformation of the t → m type determines the inelastic stage of deformation of ceramics based on zirconium dioxide stabilized by additives of yttrium oxide. The maximum deflection force of the cantilevers of a two-cantilever specimen with a chevron notch, tested by wedging, determines the critical characteristics of the crack resistance of ceramics ZrO2 + 3mol% Y2O3: the rate of energy release Gc during crack propagation (specific energy of destruction) and the stress intensity factor KIc. The maximum viscosity is characteristic of ceramics with the composition ZrO2 + 3mol%Y2O3, the deviation from which reduces the fracture toughness. The increase in fracture toughness is favored by the grinding of the powder in a planetary mill.

Despite the slip at HPT the deformation is still carried out

Modeling the growth of a crack originating in the sample volume

The microstructure, phase composition and mechanical properties of a low-carbon steel billet, obtained by the electron-beam additive manufacturing method using an industrial welding wire, have been studied.

Plasma electrolytic processing allows to heat and/or to polish both components of bimetals separately or simultaneously

Self-diffusion parameters for melts of Ni-Al and Ti-Al systems, depending on the concentration of the components, have found by the method of molecular dynamics

Quantum theory and analysis of chemical reactivity were applied to choose suitable adsorbents that ensure efficient solid-phase microextraction of dioxane and dioxalane from milk. It is shown that carbon nanostructures possess some advantages over primary and secondary amines.

Microstructure of cemented carbide. Ellipse marks the example of the analyzed “island” Co grains. CW and PW mark the example of WC/WC GBs completely and partially wetted by a Co binder. IA and OA are incoming and outcoming angles in the cobalt binder.

In the microstructure of ZrO2 based composites, both undivided, entangled bundles/aggregates of SWCNTs and individual nanotubes are observed, which together form a continuous reinforcing structure, which leads to a refinement of the grain size of the composites.

Characteristic defects of solid-phase joints in a three-layer corrugated structure made of titanium alloy.

Graphical abstract shows the formation of pits on the surface of the processed thin films by magnetron sputtering

Athermal grain boundary sliding due to the motion of virtual dislocations of planar shear mesodefect essentially facilitates microcracks nucleation.

The dependence of the vibration response of the conductor on the action of an electric pulse as an interference of damped oscillations of the acceleration value generated at the leading and trailing edges of the electric pulse when the duration of the Timp of the electric pulse changes.

A theoretical study of the structure and properties of a chiral SA3 diamond polymorph has been performed. The chiral SA3 phase can be obtained by polymerization of nanotubes (5,4). The unambiguous identification of this phase is possible using X-ray diffraction analysis, X-ray absorption and Raman spectroscopy.

Consolidation of detonation nanodiamond: effect of thermobaric sintering. The size increase in the nanodiamond core occurs through the growth of both the diamond phase and ordered graphite.

It was found that the electric pulse treatment of cryorolled cooper leads to the development of recovery processes and continuous static recrystallization, provides a transition from in-situ recrystallization to grain growth, which leads to a sharp decrease in hardness.

Values of Lankford coefficients for various thickness reduction at rolling UFG steel.

The tensile specimen deformed by tension until fracture, the drawing of longitudinal section of the specimen and the EBSD map of the area adjacent to the fracture surface

In present study, cryorolled and naturally aged AA2024 alloy sheet and annealed commercially pure titanium sheets were subjected to USW. Microstructure and properties of the welded joints after natural aging were examined.

Ductile-brittle transition behavior of medium-carbon steel with 0.32 %C-1,35 %Mn-0,003 %B by instrumented impact testing and fracture analysis was studied. On the load-displacement curves the periods corresponding to different zones of crack propagation are distinguished. Each period can be quantitatively described by a set of strength, plastic and gradient parameters.

Composite materials of the composition polyethylene-graphite-manganite exhibit positive or negative magnetoresistance, depending on the ratio of the components.

Tetragonal distortion of the γ phase and lattice parameters ratio of the α2 phase obtained for the investigated alloys in the duplex conditions.