Section of Mechanical and physical properties of materials

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)

Physico-chemical properties of silicon-carbon films obtained by electrochemical deposition

Al-Nb composites demonstrate a considerable dependence of tensile strength on HPT straining which almost doubled upon the increase of torsional straining from 30 to 100 rotations of HPT anvil and reached 530 MPa. Annealing resulted in an increase in ductility up to ~12% with a slight decrease in tensile strength.

The deposition of corrosion products on the surface of the alloy ZK60 creates the compressive internal stresses of types I and II.

Carbide/binder grain boundaries in a FIB lamella prepared from the WC-Co-Re cemented carbide were examined by high-angle annular dark field scanning transmission electron microscopy and energy dispersive X-ray spectroscopy at a high resolution. Rhenium was found to segregate at the grain boundaries forming complexions of 2 to 3 atomic monolayers, which presumably consist of mixed W-Re carbide.

Diagrams true stress-strain for: artificial aging (AA) and ultrafine-grained (UFG) state of 6101 alloy

The figure shows the mass gain depending on oxidation time of the TNM (Ti-43.5Al-4Nb-1Mo-0.1B, at,%) and TNZ (Ti-44Al-6(Nb,Zr,Hf)-0.15B, at.%) samples, which were exposed to air at 800°C. The dotted lines show the approximation from 500 to 1000 h.

As a result of cryogenic deformation of Ni to 90%, a coarse fibered structure with a developed nanocellular substructure and extremely low amounts of dynamically recrystallized nanosized grains was formed.

Microstructure of beta titanium alloy VT35 after different thermo-mechanical treatments.

Представлены две деформационные кривые при растяжении без тока и с током в сплаве с памятью формы. Видны скачки напряжения вверх и вниз, вызванные фазовым преращением и электропластическим эффектом, соответственно.

The effect of carbon-alloying (1 at.%) on the hydrogen embrittlement susceptibility of equiatomic high-entropy alloy FeNiCoCrMn has been studied. The carbon-alloyed alloy has higher resistance to hydrogen embrittlement compared to the interstitial-free Cantor alloy.

Multilayer structures of resistive sensors based on thin polymer films, SEM images of microstructures of film samples and calibration characteristics

SEM image of hybrid five-layered composite based on steel and aluminium alloy with interlayers of basalt fiber-reinforced polymer.

Crack and debris on friction surface of babbitt B83 at hard wear mode

Typical view of the "Torque - angle of twist" diagrams during the torsion test of specimens with a diameter of 3 mm made from magnesium alloy Mg-Zn-Ca after annealing (1) and after ECAP (2)

The formation of CaAl12O19 platelets in sintered Al2O3-ceramics leads to the increase in fracture toughness by 48% (up to 5.2±0.4 MPa*m1/2).

Nanostructured NiTi and its tensile behaviour.

The thermokinetics of shape recovery after bending of Ni-rich titanium nickelide was studied. Loading–unloading procedure was carried out in various phase states using isothermal and non-isothermal modes varying loading strain. The two-stage character of shape recovery under heating is revealed; the hypothesis of its origin is suggested.

Possibility of using silver nanoparticles (Ag NPs) as additive for silicone elastomers as internal heating agent for microwave radiation assisted local curing is experimentally investigated. The obtained PDMS/AgNP composite materials acquired a significantly higher work of adhesion to glass, a lower viscoelastic modulus and slightly higher wettability. With time of microwave treatment and consequently cross-linking of the material those parameters head towards or approach those of the stock PDMS material.

Extensive hydrogen desorption, which is continued and not ceased even after 24 hours after pre-exposure of ZK60 samples in the corrosion solution, is the evidence for the corrosion reaction occurring under the layer of corrosion products.

Protective coatings that improve the corrosion resistance of the E125 zirconium alloy under conditions of the combined effect of a hydrogen-containing medium and friction wear have been investigated.

Mechanical properties of Ti-6Al-4V three-layer material

The force change depending on the deflection during DWTT Curve No. 2 - the notch is perpendicular to the direction of vibration (WD); Curve No. 3 - the notch is parallel to the direction of vibration (WD). A characteristic feature of the deformation diagrams for specimens with the parallel notch is the presence of two local maxima. This contrasts with the force change curve for the perpendicular notch specimens.

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.

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.

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.

Modeling the growth of a crack originating in the sample volume

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

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

Regulation of the corrosion rate of bioresorbable magnesium alloys through the use of vacuum zirconium coatings.

The microstructural images of superalloy subjected to different solid solution treatment obtained near the fracture zones of samples after creep tests at 850°C / 450 MPa.

Electric spark deposition of AISI 1045 in mixtures of iron granules with an amorphous CrMoWCBSi composition and the addition of WC powder makes it possible to form a composite coating of an amorphous matrix reinforced with tungsten carbide grains.

The characteristics of the stress-strain state determine the path and geometry of quasi-cleavage cracks in hydrogen-embrittled low-carbon steels.

In the work the possibility of obtaining promising layered metal-rubber composites based on low-carbon steels, aluminum alloy Al-Mg3 and heat-and-frost-resistant rubber by hot pressing is studied. The influence of the composition and design of composites on the impact strength at temperatures of 20 and -60 °C and the damping properties of materials determined by the method of dynamic mechanical analysis is discovered.

Diagrams «torque - twist angle» during torsion testing of samples of hot-rolled coarse-grained (1) and ultrafine-grained (2, 3) titanium Grade4 after ECAP conforms (2) and ECAP conforms + drawing (3)

The results of experiments on tension of the Ti-6Al-4V alloy in the range of strain rates from 0.1 to 1000 1 / s under uniaxial and complex stress states are presented. It was found that Ti-6Al-4V alloy exhibits a transition in fracture behavior from ductile to brittle at the stress state triaxiality parameter range from 0.44 to 0.497.

The strain rate significantly influence on the functional properties of the NiTi alloy. In some cases, the shape recovery curves during thermocycling are completely different.

Preliminary deformation leads to an increase in the recovery stress only at a stiffness, at which the recovery stresses was close to the value of the yield stress in non-deformed specimens.

Median –0.0011, average –0.0010, max. 0.2135, min. –0.1775, standard deviation 0.0705.

Allocation of intermetallic phases in the material. Friction track and example of data recording of friction coefficient change.

Content increasing of nickel up to 20-25 % and molybdenum alloying, leads to a decrease of the peak strain values level during forging in the temperature range 900 - 1200 ° С at the 0,1 s-1 deformation rate

Fuel cells are the most efficient means to directly convert stored chemical energy to usable electrical energy. Doped ceria is considered to be a promising electrolyte for intermediate temperature operation.

It shows the wear behavior of three different orientations (a) Basal, (b) Prismatic, and (c) Pyramidal for the AZ91 magnesium alloy.

SEM images of obtained (co)polymers samples and installation for measuring of thin film sensors conductivity as a function of air humidity.

Magnetocaloric effect in as-cast Gd2In

Ni-14(Al, Ta)-30.7(Co, Cr, W, Hf) (wt.%) superalloy microstructure.