Том 14, Выпуск 4, Декабрь 2024

This review is focused on the recent progress on the relationship between nitrogen-assisted hardening mechanisms and mechanical properties of the CoCrFeMnNi-N family alloys. The basic physical problems, including fabrication of the nitrogen-alloys Cantor alloy, solubility of N in CoCrFeMnNi system, as well as the influence of nitrogen alloying on strength properties of the CoCrFeMnNi-N alloys have been discussed.

The microstructure of alloys containing 2.4, 3.2 and 4 wt. % Sb sintered at 1300 °C. After Hopkinson's test, adiabatic shear bands were formed in alloys containing 3.2 and 2.4 wt. % Sb.

The microstructure of heat-resistant dispersion-hardened 12% chromium ferritic-martensitic steel 16Cr12MnWSiVNbB (type EP-823) demonstrates good thermal stability during aging at 450°C for 5000 h. This maintains its strength properties at the initial level.

Dispersion strengthening of the γ-phase particles by the γ′-phase particles in shape memory NiFeGa(B) alloys occurs during hot rolling and subsequent annealing. The optimal texture of the annealed crystals with the special microstructure, should contribute to strengthening the material without cracking along the grain boundaries.

Strain energy of the diamane molecule and its BN analogue.

Al−Cu phase diagram with the tie-line of grain boundary wetting phase transition at Twmax

Simulation of a uniaxial tension-compression test of a composite with Maxwellian constituents gives average stresses in the matrix, inclusions and the whole composite.

Using the molecular dynamics method, a study was conducted on the influence of structural defects, carbon and hydrogen impurities, as well as the presence of a shell of another metal, on the melting temperature of metallic nanoparticles.

SEM - images of characteristic elements of the SCMnCr 3 steel surface after spark assisted deposition of the tin bronze coating (a, c - spherical particles; b - sponge-like structure; d - influxes; e - cracks; f - the result of the collision of a liquid drop with the surface; g - pore )

Microadditions of yttrium has resulted in a decrease in the average grain size of low-activation austenitic steel. The decrease in the efficiency of dispersion strengthening by carbide particles has led to a slight decrease in the strength properties of the new steel. MC particles are containing Ti, V, Ta and W surrounding Y kernel.

This paper presents a method for determining elastic constants — the elastic modulus and Poisson's ratio of 3D-printed materials using uniaxial tension test on rectangular cross-section samples. It is proposed to conduct longitudinal and transversal strain measurements on the surface of the samples using fiber-optic sensors based on fiber Bragg gratings, which offer comparable accuracy to standard electrical strain gages while providing advantages such as reduced size, simplified preparation, and minimal equipment requirements

To assess slippage at HPT, the “joint torsion of the disk halves” method was used.

The informative drawing shows the structure of CrMnCN steel and the features of its deformation behavior at subzero temperatures.

Based on the results of tests for three-point bending, the dependences σ-ε were constructed for samples CrMnFeCoNiZr alloy in the initial state (as-cast) and after HPT. The samples in their initial state exhibit typical plastic behavior even with deformations of more than 10%. HPT processing of samples leads to brittle-plastic behavior of the material.

Change in sp2-hybridization to sp3 results in an increase of Young's modulus and a decrease of Poisson's ratio for bornitrane. The substitution of carbon atoms by B and N atoms in the lattice of graphyne and graphene, leads to a decrease in Young's modulus.

The picture shows regression analysis of the mass gain curves and the rate of mass gain depending on oxidation time obtained for samples of the TNM, TNZ and TNZ+ alloys in the near duplex (1 and 2) and near lamellar (3 and 4) conditions subjected to oxidation at 800°C.

An abrupt increase in the crack size when the disclination strength exceed a critical value

The ultrasonic vibration of substrate with deposited layers was simulated. The dependencies of the beam deflection on the length and height of the wall were studied

It was found, that a half-hour annealing in the temperature range of 250-500oC of cryorolled nickel with dislocation-cellular work-hardened structure, activated its static recovery and recrystallization.

In our graphical abstract we tried to summarize the algorithms and show the main diargam of calculations. We hope that it's not very complicated for the perception)

Steady-state concentration for HPT and ECAP in Al-Mg alloys

The microhardness of the disks composed of amorphous and crystalline ribbons became higher than microhardness of the more solid disks consisted of amorphous ribbons due to formation of additional stresses in crystalline ribbon during vortex-like mixing of the materials with different hardness.

The comprehensive method for obtaining by Spark Plasma Sintering (SPS) a fine-grained fully dense alumina-based ceramics with a relative density of 99.9%.

1570C alloy after rolling at room and cryogenic temperature and subsequent electric pulse treatment

In this work, residual stresses in coarse-grained, fine-grained and ultrafine-grained states of the deformable alloy MA-20 were estimated using methods of X-ray diffraction analysis

Pressure welding scheme and mechanical properties of welded samples from different combinations of superalloys based on nickel.

The image shows a dark-field electron microscopy photo highlighting WTa particles, an electron diffraction pattern of these particles, and a molecular dynamics model. Calculations suggested TaW particle formation at grain boundaries and dislocations, later confirmed experimentally.

The abrasive wear rate of PEO coating with graphene nanoparticles is 15-16% lower than that of PEO coating without additives. The micro-Raman spectra for the following hard layer indicate a significant disorder of graphene particles, a decrease in their size and the formation of SiC and carbon nanotubes inclusions.

The EBSD maps and ultimate strength of welded specimens for two combinations of EK61//EP741NP and VKNA-25//EP741NP.

Multi-step isothermal forging and cryorolling affected intergranular corrosion, with cryogenic rolling being more effective in improving corrosion resistance.

Impact loading diagrams and fracture surfaces of the magnesium layered material produced by diffusion bonding