Раздел "Механические и физические свойства материалов"

Effect of TiC particles on microstructure and the yield strength of a cast 7075 alloy-based metal matrix composite

The article investigates and substantiates the feasibility of using acoustic emission (AE) for monitoring and diagnosing laser processing of ultra-hard materials. Using laser probing as an example, it is demonstrated that AE parameters carry valuable information about process efficiency, material properties, and underlying physical phenomena.

The change in the structure of the magnesium alloy with increasing loading rate is shown, both in the cross section and on the fracture surface

The paper presents the structure and its parameters of coatings based on a nickel heat-resistant alloy. The results of heat resistance tests and surface analysis after oxidation are shown.

The regularities of the change in the friction coefficient Kf and wear rate W of the nanostructured Ti49.3Ni50.7 shape memory alloy with an increase in the test temperature are established. It is shown that the changes in Kf and W are caused by thermally induced phase transformations. The temperature Md is determined for the alloy under study.

The new Fe-32Ni-2.7(Ti, V, C) Invar alloy demonstrates high strength after hot forging and thermal treatment while maintaining acceptable ductility and a low coefficient of thermal expansion.

Results for determining elastic moduli and Poisson’s ratios in tension and compression for rock salt, with analysis of error estimates based on the provided relations are presented.

SEM micrograph of the quenched sample after annealing at 600°C

Three-dimensional image of the surface relief of the wheel rollers before and after modification and testing

The stability in the temperatures of the B2 - B19' martensitic transformation on thermal cycling without stress does not keep on thermal cycling under stress

Fe additions (1.0–8.0 wt.%) to additively manufactured Ti4Al3V alloy induce a columnar-to-equiaxed grain transition, with grain boundary strengthening prevailing in yield strength enhancement at 1.5–3.0 wt.% Fe.

Forming scheme for a given pressure-time function. The colors on the right graph indicate different points of the shell.

The implementation of the deformation thermocyclic treatment with the gradual decrease in the heating and rolling temperatures and subsequent cooling of the blank in water followed by tempering at 550 ℃ was an effective way to refine the microstructure and obtain high both ultimate tensile strength of up to 900 MPa and impact toughness without brittle fracture down to the test temperature of -70 ℃.

1. The presence of a PLGA layer on a MAO coating led to a substantial enhancement in adhesive strength, with an increase of approximately 2 times and increase in microhardness by 1.2 times. 2. The corrosion resistance of MAO-PLGA increased because corrosion current density decreased to 1.40×10-7 A/cm2 and polarization resistance increased to 4.51×105 Ω∙cm2.

Tensile properties of the TNZ alloy produced as a small laboratory ingot (conditions 1 and 2) and a large-sized industrial ingot (conditions 3 and 4) after forging and heat treatment.

Figure (framing of video) shows filiform corrosion propagation process and point of pitting formation initiation

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

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

Crystal structures of FeMnVGe with different atom arrangements.

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

The transformation temperatures significantly decrease on thermal cycling of the cast samples and remain constant in ribbons samples with the sample chemical composition .

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.

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.

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)

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.

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

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.

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

The microcrystalline strain ε(P) in highly compressed La3Ni2O7-d superconductor was determined in the pressure range of 1.6 GPa ≤ P ≤ 41.2 GPa. We found that ε(P) has a three-dome shape in this pressure range.

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.

Tensile strain behavior accompanied by low and high duty cycle current

The contributions of dispersion and solid solution hardening mechanisms are comparable and provide a smaller contribution to the YS improvement of the Ti6Al4V-Cu alloys as compared to that the grain-boundary hardening

Multiaxial isothermal forging significantly improves stress corrosion cracking resistance of the ZX10 alloy

Compared with traditional annealing without a field, unsaturated magnetic field annealing leads to a more significant improvement in the soft magnetic properties of an amorphous alloy with a higher Ni content.

Dilatograms of PT-3V SLM-specimen and a rod.

The stress-induced martensite formation depends on the strain rate. A higher strain rate results in a lower proportion of stress-induced martensite.

Ultra-high frequency acoustic oscilations of main gas pipeline wall are one of the causes of stress corrosion of the metal pipeline

Grain boundary sliding caused the grain boundary region to thicken and the grain boundary structure was disordered. This resulted in the increased mobility of Zn atoms in this region and the formation of a segregation layer in the center of the grain boundary.

Ti-based metallic porous structures with adjustable mechanical performance developed by computer-assisted design and produced by laser powder bed fusion to engineer advanced bioactive implants for orthopedic applications.

Artificially created materials - metamaterials, with a specially selected structure during the deformation process correspond to the behavior of structures. Metamaterials have unusual properties: additional degrees of freedom, negative Poisson's ratio.

The picture shows the effect of upset forging and heat treatment on yield strength (YS) and ultimate tensile strength (UTS) of the TNZ γ-TiAl alloy in the temperature range of the brittle-ductile transition.

Ultrasonic welding of nickel sheets resulted in the formation of an ultra-fine-grained structure in the joint area. Increasing the welding time caused growth of new grains across the joint interface.

The combination of hot MIF and subsequent cryorolling is a highly efficient method for producing (ultra)fine grained aluminum sheets from 1570C alloy with unique mechanical properties.

Experimental results allowed the explanation of the nature of GMS as the mechanism of fragmentation under intense loads.

Non-linear volt-current dependences with a zero current area have shown their ties with the structural state of carbon surface layer formed by 2-3 graphene planes assembled in an onion-shaped structure with these planes disoriented with respect to each other so that their new positions differ from the positions in the ideal graphite crystal.

High-rate SP at a temperature of 300°C is carried out by combining cooperative grain-boundary sliding and intragranular dislocation slip in UFG Al-Mg-Mn alloy

Average grain size and tensile strength of nanostructured Invar alloy (36N) as the function of annealing temperature in different structural states. SEM images of the microstructure of the 36N alloy in the nanostructured state state and after hourly annealing.

Mechanical properties, corrosion resistance and biocompatibility in vitro of pure Zn processed by high pressure torsion (HPT) were studied. Grain refinement and texture changes caused by HPT increase strength and ductility. HPT does not worsen the RBC hemolysis and ML viability of pure Zn. HPT insignificantly increases the degradation rate.

Increased fatigue resistance of grade 4 titanium as a result of complex processing, including the formation of an UFG structure and non-abrasive ultrasonic finishing of surface