Раздел "Механические и физические свойства материалов"

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

Dependence of the crack shape (length/height ratio) for three-layer material with layers having different strength.

Searching for the optimal thermal cycling temperature range of the NiTi alloys, which would provide the most stable actuator performance.

The effects of the heat treatment regime on the fatigue strength and frequency stability of samples made of martensitic-aging steel 03Ni18CoMo5Ti-EBR were investigated. The tests were carried out on an original electromagnetic installation operating in self-oscillating mode during cyclic tests using a "soft" cantilever bending scheme of flat samples.

The microstructure of samples that were formed after mill processing has differences from the structure of samples that were formed after the charge mixing in the form of a noticeable grinding of the excess ɛ-phase, increased chromium content both in the α-solid solution and excess ɛ-phase (by 34%), as well as crushing of metallic chromium inclusions.

mechanical properties of thim films obtained by nanoindentation

The LPSO phase in magnesium alloys raises their ignition temperature by ≈100°C in the as-cast state and by ≈200°C in the heat-treated state

The inflection point on the dependence of the median frequency of acoustic emission on strain as an evidence of the intensification of the dynamic recovery process

The test sample before and after SPF

The results of this work demonstrate improved wear resistance of the Ti6Al4V-Cu alloys, because copper provides refining the β-grains and consequently α- and α′ crystallites.

2D image and SEM micrograph of worn surface of Fe66Cr10Nb5B19 amorphous coating obtained at 60% of explosive charge.

The magnetoresistive effect of the samples in initial state reached 3.25 % in magnetic field of 10 kOe. It was established that the composites structure, magnetoresistivity and magnetic properties are steady against thermal heating.

Shape memory effects were studied in NiTi/Kapton composite produced by deposition of thin NiTi layer on the Kapton substrate by electronic beam evaporation.

Developed unit for adhesion studies of contact processes in heavy-duty high-temperature tribocouplings.

Regardless of δ-ferrite fraction in the additively manufactured CrNi stainless, the increase in strain rate slows down the kinetics of strain-induced γ→α' martensitic transformation, but weakly influences the stress and strain, at which the macroscopic transformation stage starts.

Diagrams "Torque - angle of twist" (a, b) and "Fatigue kinetic diagrams" (c, d) of materials for medical applications. 1- СG materials; 2, 3 - UFG materials (2- ECAP-C; 3- ECAP-C +D)