Section of Structure design and analysis

Experimental thermogram of differential scanning calorimetry of pure polypropylene

Microstructure and crystallographic texture evolution at SCC.

Informative picture demonstrates abnormal strain rate dependence of peak strain in the range of 1 to 100 s-1. The presented structures comply with the loading diagrams.

LPBF of multiple sieved powder of Co-28 wt.% Cr-6 wt.% Mo leads to the formation of samples with inclusions of Cr and Mo within the bulk. Increasing the duration of annealing post-treatment leads to the initiation of diffusion processes, which, in its turn, leads to the gradual dissolution of Cr and Mo inclusiuons

Superplastic forming of Ti-6Al-4V commercial sheet with non-homogeneous initial microstructure (d=0.3-25 micrometers) at rather low temperature of 700C with a constant argon gas pressure of 2.5 MPa was performed for the first time. Superplastic forming of Ti-6Al-4V sheet at 700C led to an improvement of microstructure homogeneity and randomization of the rolling texture.

Tantalum-containing film with superhard inclusions

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

The paper investigates the effect of long-term operation at a temperature of 515 °C on the structure and properties of steel grade 08Cr16Ni11Mo3. As a result of the study, it was found that during operation at a temperature of 515 °C for 195,000 hours in steel grade 08Cr16Ni11Mo3, the structure changes with the formation of secondary phases, initiated by the release of elements with limited solubility from the supersaturated solid solution. A change in the phase composition during heat aging leads to embrittlement of steel - a decrease in plasticity.

Fracture surface of HPT processed hybrids Al-Mg after annealing at 275 °C

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.

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.

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

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.

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 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.

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.

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.

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

Despite the slip at HPT the deformation is still carried out

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.

The oxide layer in the zone of solid-phase joint (SPJ) of ultrafine-grained titanium alloy VT6. The observed oxide layer reduces the shear strength of the SPJ by more than 2 times.

It was found that the electric pulse of low capacity leads to the development in the cryorolled pure aluminum of recovery and continuous recrystallization without hardness changes. Under threshold energy conditions there were found transition from in-situ recrystallization to grain growth, and sharp decrease in hardness.

The effect of the temperature of equal-channel angular pressing ranging from 0.45 to 0.75 Tm on the processes of grain refinement in the Al-3% Cu alloy was investigated. An increase in temperature led to increasing the average size of new grains, decreasing the average misorientation of intergranular boundaries, and shifted the formation of a fine-grained structure towards the higher strains.

Heat treatment at 700 ° C of commercially pure grade 4 - Grade 4 titanium results in the release of β-modification nanoparticles. The deformation of the material leads to an increase in the volume fraction of particles precipitated after annealing.

Graphical abstract shows the electrochemical behaviour of nanocrystalline Ni, Ni90Cu10, Ni-TiN and Ni90Cu10-TiN thin films processed by reactive magnetron co-sputtering

Cold rolling of Fe-17Cr-13Ni-3Mo-0.01C austenitic stainless steel leads to the formation of a fragmented structure with a high density of crystal structure defects. The main deformation mechanism during rolling is dislocation slip, which is accompanied by the development of mechanical twinning as an additional mechanism contributing to structure fragmentation. Saturation with hydrogen promotes more active development of twinning and the occurrence of the γ → ε phase transformation, and an increase in the current density upon saturation of the samples with hydrogen before rolling and a decrease in the deformation temperature is accompanied by an increase in the density of twin boundaries and the density of dislocations.

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.

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

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 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.

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.

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.

Diagram of sample preparation in making steel subjects of research by methods of transmission electron microscopy.

Dependence of residual stresses on the energy of electrospark processing and a method for their determination.

Temperature dependence for the fraction of Fe14Nd2B grain boundaries completely wetted by the Nd-rich phase

Scheme of passivation of compact samples.

The degradation processes occurring in massive inclusions of the chromium-nickel cast iron carbide phase during deformation at high temperatures (400-600 ºС) are studied. The effect of the local deformations on easy slip of dislocations is considered. We also demonstrate that during the dislocation slip, the new phases appear and the energy dissipates.

Polymer сomposites with a concentration of 20 wt. % polyethylene and 80 wt. % iron exhibit extrinsic piezoresistance of about 30% in the pressure range of 0–170 kPa

Nanoscale precipitates of aluminides of transition metals and the main strengthening phase are one of key factors controlling nanostructuring the Al alloy 1965 during SPD and its mechanical properties.

Iron atoms in solid solutions of magnesium-bismuth niobate have the charge state of Fe3+.

Microstructure of Sn-Si-O film according to HRTEM. Silicon-doped tin dioxide films (Sn-Si-O) were produced by RF reactive ion-beam sputtering of a composite metal tin target in a controlled atmosphere of argon and oxygen.

Shear deformation is one of the effective ways for grain boundary engineering. In the current contribution, the effect of the shear deformation incorporated into the conventional drawing process is investigated.

Using atomic force microscopy, the surface topology of steel 1.0481 with a stitch structure was studied and its roughness and waviness were measured. An analysis of the results showed that a surface with a stitching structure is more developed and has higher values of fractal dimension than the homogeneous structure of troost-martensite.

The solidification of the Al86Ni6Gd4Tb2Er2 liquid alloy under pressure of 3 and 7 GPa leads to a change in its phase composition. At a pressure of 7 GPa, metastable crystalline phases were obtained.

The structure of the3D frame-bridge NiTi sample produced by wire arc additive manufacturing is more complex than the structure of the simple “walls”.

Monolithic and defect-free samples of the Al-Nb hybrid system aluminomatrix composite at the various deformation conditions and the initial dimensions of the disk were processed by HPT. The greatest refinement of the structural components and the formation of the metal matrix structure, which led to a maximum level of microhardness HV ~ 300, took place when the number of revolutions of the anvil was 30 and the strain rate was 2 rpm.

Effect of energy inhomogeneity of spark pulses on the structure of an electric spark coating: a - energy picture of the distribution of spark pulses; b - granularity of the coating structure

The correlation field of the degree of tetragonality of Y-TZP ceramic and the monoclinic phase content in it after aging in water vapor at 180 ° C and a pressure of 0.2 MPa for 20 h.

Dependences of the true stress on the true strain of the studied alloys at 1200°C and the microstructure of one of them

-A combined technology for deposition of protective coatings on a heat-resistant nickel alloy Inconel 718, combining methods of electro-spark deposition and magnetron sputtering, is proposed. -Double-layer MS-ESA MoSiB/ZrSiB and CrAlSiB/ZrSiB coatings increase the oxidation resistance of the nickel alloy, respectively, by 12 and 40 times.