Volume 8, Issue 3, August 2018

A microphotograph of a cross-section of SMFM-Pb with a porous bronze layer having a "columnar" structure: 1 - steel base, 2 - spike of the bronze layer, 3 – PTFE-composition.

A mesoscopic distinct element method enables large-scale modeling of carbon nanotube networks. Massively parallel dynamics engine allows studying self-assembly and mechanics of micrometer-size specimens.

On the original laboratory bench, which allows to simulate the technological cooling rates of hot-rolled sheets in the process of controlled thermomechanical processing, the thermal effect of bainitic transformation in low-carbon low-alloy tube steel 06G2MB type is determined.

The contact zone of the composite plates for the shell of the petrochemical reactor (coke drum) produced by explosive welding and made of steel 08Cr13 and steel 12CrMo has multilayered structure. The carbon segregation provokes the eutectoid decomposition that causes formation of colonies of rod-shaped carbides. As a result, there are two risk zones: the melted zone (2) and the segregation zone (3).

At cooling from T~ 400 K a La0.82Ca0.18MnO3 single crystal undergoes the transition from pseudocubic O* phase to Jahn-Teller O' phase and the reverse transition from the O' to low temperature O* phase. It is surprising that low values of the internal friction are observed for crystal phase O' with significant Jahn-Teller distortions of oxygen octahedra.

The influence of titanium on the changes in the structure of the cascade development region can contribute to the reduction of the radiation swelling of vanadium through the formation of vacancy clusters of smaller dimensions.

Metalloceramic NiCrBSiFe‒WC coating on structural steel 40Kh was prepared by the method of laser cladding process. The cladding was performed making use of the multichannel continuous СО2 laser radiation.

On the presented time dependences of pressure change and electrical resistance of the sample during the ETE of the reaction mixture W-Ni-Al, it is evident that the preheating time was 2.6 seconds, and the duration of the thermal explosion stage was 0.5 seconds.

Softening of the flexural surface acoustic wave leads to spatially periodic static bending deformation (modulation) of the embedded nanolayer with the definite wave number.

The results of an investigation of the EPR and the magnetic susceptibility of BiNb1-xFexO4-δ orthorhombic modification

Variability of Poisson's ratios for dentin and enamel.

Whisker structures formed on the surface of the defective crystals layers

When a domain wall moves through a magnetic defect region (marked with dashed lines), a localized nonlinear wave (magnetic breather) is excited.

Microstructure of iron deformed by multi-axial forging and corresponding distribution of misorientations across deformation-induced boundaries.

The main mechanisms of plastic deformation under high-speed compression and tension of CoCrFeMnNi single crystals are the formation of stacking faults and bands with a hcp lattice, the subsequent twinning occurs only upon stretching. Deviation from the equiatomic composition significantly improves the physical and mechanical properties of this alloy.

During the cyclic deformation the energy dissipation zone covers a significant amount of the titanium sample and the zirconium alloy one in the ultrafine-grained state. For the coarse-grained and fine-grained states the growth of thermal energy has a localized character in the active zone of the samples. Cyclic loading of the titanium sample and the zirconium alloy in the ultrafine-grained state is accompanied by a qualitative change in the energy absorption dissipation process.

The research of dispersed precipitates in high-strength medium-carbon steel after tempering in the temperature range up to 600 °C was carried out. Amount of retained austenite decreases and cementite is forming instead of austenite by growth of the tempering temperature.

The technological properties of the titanium alloy VT6 were studied. It is established that it can be successfully used in SPF/DB technology under conditions of low-temperature superplasticity at temperatures of 750-800° C. The model of the hollow blade of a three-layer structure was made from this alloy.

The method of consolidation of metal powder is proposed, this method consists in applying a layer of metal powder on the surface of the detail, compressing the powder at a point between the workpiece and the electrode, and sintering at this point by electric pulse. Sequential dot by dot sintering leads to the formation of a new layer and allows to obtain bulk materials.

Using different cold-rolled and annealing regimes different primary recrystallization texture in Fe-14%Ga was obtained. Values of magnetostriction decreased in conformity with the decrease of texture components containing easy magnetization directions.

The function of the force parameters (axial force and torque) recorded in the experiment and the preset kinematic parameters (the rate of tension and the torsional velocity), the strain rate sensitivity coefficient and the approach angle between the stress vectors and the strain rate on the specimen surface under complex loading.

In the three-layer composite PZT / FeRh / PZT, the possibility of control the temperature of the magnetic transition and width of the hysteresis by electric field was demonstrated.

Neutronographic research (T=300 K) having been carried out on highly doped Zn0.9Ni0.1S, Zn0.95Fe0.05Se, Zn0.99V0.01Se cubic crystals of diluted magnetic semiconductors shows that unhomogeneously distorted nano volumes, of ellipsoidal forms emerged at small dopant content in initial lattice, oriented to crystallographic directions which depending on Jahn-Teller ions type, are transformed to two-types form, leading to loss of initial orientations having been ascribed by supplied describing statistics of investigated phenomena. The figure illustrates observed changes direct scheme build on processed data of diffuse contribution partitioning to scattering on Zn1-хVхSe crystals, when the longest axes of nano regions at small dopant content (х~0.001) lie previously along <111> directions (the small cell of the cube containing the unhomogeneity corresponds to the elementary cell of the ZnSe structure), the case of high level doping are assumed to be considered as damage degrees of crystallographic planes of initial lattice.

Grain boundary wetting by the melt in the Cu-10 wt.% Ag alloy

Extrinsic grain boundary dislocations (EGBDs) are formed in grain boundaries during plastic deformation of polycrystals EGBDs cause a nonequilibrium structure of grain boundaries, long-range stress fields and enhanced energy Nonequilibrium grain boundaries are typical for bulk nanomaterials processed by plastic deformation mnethods