We consider the effect of laser shock peening without coating (LSPwC) on the structure and stress state of the AMg6 Aluminum alloy with a thickness from 4 to 14 mm before and after preliminary thermal annealing. The roughness parameters Ra and Rz after LSPwC are determined. The magnitude, depth, and profile of compressive residual stresses (CRS) are found to depend on the thickness of the material and preliminary heat treatment. The layer-by-layer X-ray diffraction analysis shows a correlation between the parameters of the crystal structure and the profile of residual stresses for the processed samples. We find homological distortions of the crystal lattice in the CRS zone and observe the formation of significant (up to - 100 MPa) residual stresses on the unprocessed side of the samples. Also, we determine the surface CRS magnitudes for double unilateral and bilateral processing.

The results of studies of the structure and wear characteristics of the wrought aluminum alloy AMg6 after laser shock peening are presented. Optical and scanning electron microscopy revealed no noticeable differences between the microstructure of untreated and processed samples. It is shown that compressive residual stresses are observed at a depth of up to 1.5 mm and reach a maximum value of 240 MPa. After laser shock peening the wear resistance of the alloy increases by 20 %.

A device for the polarization of polymer films in the electric field of a barrier-type surface corona discharge is described, and the features of its operation are considered. The possibility of obtaining a uniform distribution of the potential of charges deposited on the polymer surface is demonstrated. Using the method of X-ray phase analysis, it is shown that the proposed method of polarization makes it possible to create an electric field on the surface of a composite film of polyvinylidene fluoride + PZT-ceramic, the intensity of which is sufficient to initiate the phase transition α → β in the polymer.

The processes of laser synthesis of films with a thickness of 80-230 μm from polyvinylidene fluoride of various grades are studied. It is established that the range of synthesis modes does not depend on the grades of PVDF. The content of the piezo active β-phase decreases after laser treatment, but the complete transformation of β-> α does not occur. The process of thermos-oxidative degradation after laser treatment is not observed. Under the same treatment conditions, the higher the open porosity coefficient, the lower the polymer melt flow index (MFI). Depending on the MFI of the initial polymer, the selection of laser exposure modes can control the porosity of the films in the range of 26-68%. Keywords: laser treatment, polyvinylidene fluoride (PVDF), porous films, melt flow index.

The processes of laser synthesis of films with a thickness of 80-230 µm from polyvinylidene fluoride of various grades are studied. It is established that the range of synthesis modes does not depend on the grades of PVDF. The content of the piezo active β-phase decreases after laser treatment, but the complete transformation of β→α does not occur. The process of thermos-oxidative degradation after laser treatment is not observed. Under the same treatment conditions, the higher the open porosity coefficient, the lower the polymer melt flow index (MFI). Depending on the MFI of the initial polymer, the selection of laser exposure modes can control the porosity of the films in the range of 26-68 %.

The microstructure and distribution of residual stresses in the AMg6 alloy after laser shock treatment in the power density range of 1.3–6 GW/cm 2 have been studied. Using X-ray structural analysis, it has been found that, after laser exposure, the size of the coherent scattering regions (CSR) decreases to 60 nm, the value of microstrains increases to 0.0018, and the average dislocation density increases from 6.6 × 10 13 to 3.7 × 10 14 m –2 . Laser shock treatment forms residual compressive stresses to a depth of 1 mm, reaching –128 MPa on the surface of the material.

The microstructure and distribution of residual stresses in AMr6 alloy after the laser shock processing in the range of power density 1—6 GW / cm2 have been studied. By the X-ray diffraction method it was found that domain size decreased up to 60 nm, microstrains increased up to 0,0018 and average dislocation density increased by a factor of 5,5 in comparing with untreated material (3,7×1014 м–2 vs. 6,6×1013 м–2). The laser shock processing generates residual compressive stresses in depth up to 1 mm, with a maximum of –128 MPa on the surface of the material.

The possibility of growing modified polyvinylidene fluoride (PVDF-2M) films by laser sintering is shown. The effect of laser radiation with a wavelength of 10.6 µ m on the polymer structure and the quality of the film sintering is studied.

The results of the studies of laser processing of alkoxide aluminum hydroxides with micrometer and nanometer particle sizes are presented. It is shown that the pseudo-boehmite processing process and phase composition of formed oxides are controlled by particle packing, laser radiation propagation in powder, and specific energy deposition. The main phases formed upon laser heating are γ, α-Al2O3; the content of δ, θ-Al2O3 is low. The minimum corundum crystallite size is ∼50 nm.

X-ray diffraction line profile analysis is adapted to investigate the microstructure of alumina. The structure of electrocorundum and corundum powders produced from pseudoboehmite with submicronic and nanometer-sized particles is analyzed. The lognormal size distribution parameters and their dependence on the conditions of corundum synthesis are determined. The structure of dislocations in corundum with different synthesis prehistories is analyzed, and structural features of the studied material are revealed.

(NH 4 )Sb 4 F 13 crystals ( I ) are synthesized and their crystal structure (tetragonal crystal system: a = 9.6431(2) Å, c = 6.5503(2) Å, V = 609.11(3) Å 3 , Z = 2, d calc = 4.100 g/cm 3 , F (000) = 664, space group I 4̅) is determined. The main structural units of I are tetranuclear anionic [Sb 4 F 13 ] − complexes and [NH 4 ] + cations. The anionic complexes are built of four SbF 3 groups linked together by tetrahedral bridging fluorine atom. At room temperature the (NH 4 )Sb 4 F 13 crystals are isostructural to previously studied МSb 4 F 13 (М = K, Rb, Cs, and Tl). The study of 121,123 Sb NQR spectra of compound I is performed in a range of 77-370 K, which shows that when the temperature decreases (<250 K) the substance exhibits piezoelectric properties, as do other compounds of this group, but with a violation of their isostructurality.

Using nuclear quadrupole resonance spectroscopy, it has been found that chloroform and dichloroethane absorbed by microporous hypercrosslinked polystyrene retain the capacity of the crystalline structure formation in small free spaces of the network on cooling, whereas p-dichlorobenzene demonstrates the complete loss of the capacity of crystallization.

The interaction of ferrocene with styrene and methyl methacrylate in media of different polarity (hexane, tetrachloromethane, and ethanol) has been studied by means of UV spectroscopy using the isomolar series method. For both monomers, intermediate complexes are formed, the medium polarity significantly affecting the complexes formation. Ferrocene acts differently in the interaction with styrene (being the electron acceptor) and methyl methacrylate (being the electron donor). It has been discovered that only in the case of ethanol a charge-transfer complex between ferrocene and styrene is formed. Possible structures of the intermediate complexes have been suggested.

A relation between the quadrupole coupling constant e 2 Qq zz and asymmetry parameter η has been found for a series of meta -substituted iodobenzene derivatives. The relationships e 2 Qq zz (η) for electrondonor and electron-acceptor substituents have the same form but different numerical values of parameters. The average time of full electron transfer via tunneling has been evaluated.

In this work, we studied the problem of determining the concentrations of substances in multicomponent mixtures with components with known extinction coefficients on the basis of absorbance expressions written under the assumption that Beer’s law for each component and the additivity principle for their mixture are valid. The main result of this work is the development of a method for calculating the uncertainty ranges of parameters of models from experimental information on the maximum permissible error of measurement.

A procedure was developed for oxidation of 4′,4″-bis(2-carboxybenzoyl)diphenyl sulfide with per acids (peracetic and trifluoroperacetic). The 4′,4″-bis(2-carboxybenzoyl)diphenyl sulfone obtained was converted into pseudodichloride, and three new polyarylenephthalides with regular alternation of the electron-acceptor (diphenyl sulfone) and electron-donor (diphenyl oxide, diphenyl sulfide, terphenyl) fragments were synthesized on its basis. The synthesized monomers can be used in the synthesis of new polyarylenephthalides exhibiting the electronic switching effect.