Методами растровой электронной микроскопии, рентгенофазового и энергодисперсионного анализа изучена структура фазовый состав металломатричных композитов, полученных кручением под высоким давлением пластин Al Cu с различной укладкой слоев: 6Cu-5Al - 6Al-5Cu. Образцы деформировали 6 ГПа, на 5 оборотов со скоростью 1об/мин. Показано, что образец 6Al-5Cu имеет более однородную структуру, чем 6Cu-5Al. Процесс перемешивания в образце протекает интенсивно во все объеме образца, а 6Cu–5Al только...

Commercially pure (99.9%) copper was severe plastically deformed by equal-channel angular pressing (ECAP) following route-Bc in three different processing regimes order to obtain ultrafine-grained (UFG) microstructures leading improved mechanical properties. In regime-1, the billets were processed at room temperature up eight passes. The 200°C passes regime-2. Regime-3 is a hybrid regime which four first, and these then for one, two all regimes, ECAP results refinement of conventionally...

This paper presents the data from study on effect of annealing Al-Cu metal-matrix composites, produced by severe plastic deformation via shear under pressure. Three-layer compositions with different alternations layers (Al-Cu-Al and Cu-Al-Cu) were subjected to high-pressure torsion, then annealed at a temperature 450 °C for 15 minutes. Using X-ray phase analysis energy-dispersive analysis, we revealed formation Al2Cu, AlCu Al4Cu9 intermetallic compounds, surrounded solid solutions Al in Cu...

The effect of ultrasonic treatment on microstructure and mechanical properties ultrafinegrained nickel processed by equal-channel angular pressing is investigated. It has been shown that with the smallest amplitude exerted strongest relaxation influence. When increase opposite observed.

The metastable ω-phase of titanium, which has a nanocrystalline structure (with crystallite size 50 nm) was formed by severe plastic deformation (SPD), namely, torsion under high quasi-hydrostatic (6 GPa) pressure. It is shown that short incubation period (300 seconds), more than 90% α-titanium transformed into ω-phase, while the static load at same time does not lead to phase transformation. TEM shows near grain boundaries (GBs), initial phase, allows hypothesize α → ω martensitic...

Abstract Results of in situ transmission electron microscopic studies annealing-induced evolution grain boundary misorientations ultrafine-grained aluminum alloy Al-4%Cu-0.5%Zr (wt.%) processed by high pressure torsion are presented. An experimental procedure based on the single reflection technique was applied for measurements orientations individual grains before and after annealing that allowed determining between them. The revealed relaxation processes occurring non-equilibrium...

The paper presents first results of obtaining metal-matrix composites based on severe plastic deformation by shear under pressure layered Al and Cu components. Three-layer with different alternation layers, i.e. Al-Cu-Al Cu-Al-Cu, were processed constrained high torsion to produce monolithic disk-shaped samples without pores. Analysis the macroscopic homogeneity showed that layers led varying degrees mixing starting

We present the results of in-situ studies evolution grain boundary misorientations in ultrafine grained (UFG) aluminum alloy Al-4%Cu-0.5%Zr during annealing. The structure UFG was obtained by severe plastic deformation method. Misorientations between grains were measured using single reflection technique. It found that relaxation processes annealing are accompanied rotation. Analysis kinetics rotation discrete-dislocation approach has demonstrated a good agreement numerical estimates and...

The results of investigations the thermoelectric and thermal properties AgxCu2-xSe (x = 0.01, 0.02, 0.03, 0.04, 0.25) alloys are presented in paper. samples with low silver content were prepared by solid state reaction pure elements argon atmosphere at 773 K temperature. Ag0.25Cu1.75Se sample was sintered phase Cu2Se Ag2Se mixture 673 K. At room temperature X-ray diffraction study revealed presence three phases samples: orthorhombic phase, Cu1.8Se cubic AgCuSe phase. heat superionic...

By methods X-ray diffraction and electron backscatter have been investigated the long maturing effect on the<br /> structural phase transformation in alloy H20N80. After thermomechanical processing was obtained structure with high proportion special grain boundaries. It has found that average size decrease, changing boundaries misorientation spectrum (Grain boundary character distribution-GBCD), changes texture test sample, composition of to remain. The reasons for this behavior be disscused.<br <br

Abstract The distributions of grain boundaries in hot-strained 80 wt% Ni-20 Cr alloy have been determined with respect to their misorientation angles and the crystallographic axes, as well reciprocal density σ coincidence sites. It is established that grain-boundary distribution formed under high-temperature deformation differs from stable spectrum typical statically recrystallized materials are prone annealing twinning. There also differences behaviour samples different spectra boundaries....

Friction stir welding was used to produce a welded joint of 1 mm thick plates copper M1 and aluminum alloy AMg2M. The microstructure the shoulder-side had areas mixing copper. In area aluminum, inclusions were observed, in copper, observed form particles thin lamellas. bottom side consists mainly X-ray diffraction showed presence intermetallic phases Al2Cu, Al4Cu9 from shoulder. formation occurred solid-state, without melting initial materials. region lamellas various lengths regions led...

Grain boundary distributions in various materials with low and medium stalking fault energy subjected to different recrystallization annealings were investigated.It was established that grain spectra all these are similar.

Summary The report gives an analysis of electromagnetic defectoscopy application together with neutron methods 2SNGK+2NNKt+SGK to cope evaluation challenges casing strings integrity and borehole annulus fillup provide industrial safety expert review operating gas wells.

Summary The report describes scanning systems, used for dipmeter surveys, gives a brief description of data processing algorithms, obtained in surveys by the system AESB-73 (ScanBK), provides calibration results carried out (ScanBK) test well OAO NPP VNIIGIS, shows comparative realized two wells ScanBK; these are indicative surveys’ geological efficiency