This paper presents the results of the study of the features of microstructure formation and changes in mechanical properties after heat treatment of welded joints, obtained by electron beam welding of extrusions from high-strength alloy V-1469 of Al–Cu–Li system. Phase transformations and nature of precipitation in different zones of the welded joint depending on heat treatment were studied by differential scanning calorimetry, transmission electron microscopy and thermodynamic simulation. It has been shown that the heat treatment of welded joints (quenching + aging) significantly increases the level of strength of the material.

The influence of the composition of the anode made of various casting magnesium alloys on its electrochemical behavior in a solution of 3,5% NaClby galvanostatic electrolysis and electrochemical impedance spectroscopy has been studied. It has been established that the use of rare earth elements (REE) as alloying elements has a beneficial effect on discharge characteristics, which allows increasing the anode efficiency and discharge capacity of the VML26 alloy of the system Mg–REE–Zr compared to the Mg–Al–Zn alloy ML5p.ch. by 15 and 7 %, respectively.

The technological properties of metal-powder compositions of VT6 alloy of different fractional composition are investigated. Synthesized samples were obtained by selective electron beam melting from metal-powder compositions of various fractions according to the standard parameters. The structure and surface roughness of the printed samples were studied. The widest possible range of fractions of the metal powder composition suitable for use in the process of selective laser electron beam melting without reducing the characteristics of the printed material has been determined.

Theresults of research of the properties of epoxy film adhesiveswith lowered combustibility and heat resistance up to 120 °C – VK-108 and VKV-28 are presented. VK-108 structural adhesive is intended for gluing parts and units from metal materials and polymeric composite materials, including honeycomb sandwich constructions.  VKV-28 foaming adhesive is designed to connect the cellular fillers with each other and with the frame elements in honeycomb sandwich  made from aluminum alloys and polymeric composite materials. Аdhesivesare self-extinguishing and meet the requirements of AP-25 (Appendix F, Рart I).

Processing of polymer composite materials with minimal defect formation is an important prerequisite for their long-term operation. Materials produced by the technology of copy-piercing electrical discharge machining (EDM) under consideration are also characterized by characteristic defects. The influence of the EDM modes, the applied conductive layer and  the electrode-tool material on the structure of the surface layer of structural carbon fiber reinforced plastic VKU-29 was studied. Technological parameters of EDM were obtained, ensuring the quality and efficiency of polymer composite materials, taking into account the minimal number of structural defects.

The paper presents the results of the influence of various combinations of electrically conductive modifiers on the electrical conductivity of model compositions based on an epoxy oligomer cured with an amine type hardener. The effect of fillers on the electrical conductivity of model compositions is investigated by the method of determining the specific volumetric electrical resistance at constant voltage. The analysis of the obtained results was performed, which allowed us to establish the relationship between the composition of the model compositions and their electrical conductivity.

The effect of alloying elements (Tb, Ce, Sm) on the properties of sintered magnets Pr(Nd)–Dy(M)–Fe–Co–B(М: Tb, Ce, Sm) as well as sintering temperature, grinding time and various heat treatment modes on the main magnetic characteristics and phase composition of magnets is investigated. It is shown that heat treatment does not significantly affect the magnetic properties. It was found that the admixture of samarium negatively affects the magnetic characteristics of materials. It has been established that the most effective materials are based on praseodymium (without admixture of neodymium).

The paper presents an algorithm for determining the length and position of a fatigue crack, based on the use of a three-dimensional convolutional neural network when testing for fatigue crack growth rate. An algorithm for calibrating a video recording system using reference marks in the form of matrix bar codes is proposed. The results of using the algorithm were compared with standard tests. Thus, the kinetic diagram of destruction obtained using a neural network model is characterized by a larger volume of observations, as well as a smaller value of the variance of the approximation error of the measurement results.

An anomalously high rate of chloride deposition observed in Gelendzhik in February 2023 during the annual corrosion tests was investigated. An estimation of the threshold value of the chloride deposition rate on samplers corresponding to the rate of chloride deposition directly on the surface of metal samples is given. The correction of calculation of the average annual rate of chloride deposition ([Cl]) under anomalously high salinity of the atmosphere is proposed. Based on the average annual climatic parameters and [Cl] by dose-response functions the forecast of first-year corrosion losses of metals is made.