Раздел "Механические и физические свойства материалов"

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.

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)

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.

Исследованы защитные покрытия, улучшающие коррозионную стойкость циркониевого сплава Э125 в условиях совместного влияния водородосодержащей среды и изнашивания трением.

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

Изменение усилия в зависимости от прогиба образца при DWTT Кривая №2 - надрез перпендикулярен вибрации (WD); Кривая №3 - надрез параллелен вибрации (WD). Характерной особенностью диаграмм деформирования образцов с параллельным надрезом является наличие двух локальных максимумов. Это контрастирует с кривой изменения усилия для образцов с перпендикулярным надрезом.

Совместным анализом инструментированных кривых ударного нагружения и изломов образцов Шарпи проведена оценка характеристик вязко-хрупкого перехода стали 32Г2Р в различных структурно-фазовых состояниях. На кривых ударного нагружения выделены периоды распространения трещины, соответствующие разным зонам в изломе.

Консолидация детонационного наноалмаза: эффект термобарического спекания. Увеличение размера ядра наноалмаза происходит за счет роста как алмазной фазы, так и упорядоченного графита.

В работе изучали микроструктуру, фазовый состав и механические свойства образцов малоуглеродистой стали, полученных электронно-лучевой аддитивной технологией с использованием промышленной сварочной проволоки.

Моделирование роста трещины, зародившейся в объёме образца

Разрывная машина и результаты измерений модуля упругости материалов и удлинения при разрыве

Термический анализ (красная кривая, ДСК) и изменение микротвердости (HV) наноструктурного сплава 36Н (синяя кривая) от температуры отжига.

Регулирование скорости коррозии биорезорбируемых магниевых сплавов за счет использования вакуумных циркониевых покрытий.

Микроструктура сплава после различной обработки на твердый раствор вблизи зоны разрушения образцов после испытаний на ползучесть при 850°C / 450 МПа.

Электроискровая обработка стали 45 в смеси железных гранул с аморфизирующимся CrMoWCBSi составом и добавлением порошка WC, позволяет сформировать композиционные покрытия из аморфной матрицы, армированной зернами карбида вольфрама.

Характеристики напряженно-деформированного состояния определяют путь и геометрию трещин квазискола в низкоуглеродистой стали охрупченной водородом.