This study is devoted to the medium-entropy AlxCoCrFe0.2Ni (x = 0.1, 0.3, 0.5) coatings obtained by non-vacuum electron beam cladding (NV-EBC). A comprehensive analysis showed that the coatings have a single-phase FCC structure at x = 0.1 and 0.3 and a two-phase (FCC+BCC) structure at x = 0.5. Crystallization promoted formation of a pronounced <100> axial texture. An increase in aluminum content from x = 0.1 to x = 0.5 led to an increase in microhardness from 228 HV0.1 to 311 HV0.1 due to solid-solution and dispersion hardening mechanisms. At the same time, the wear resistance of coatings decreased due to solidification cracking and the change in the wear mechanism from abrasive to adhesive-oxidative. The study of high-temperature oxidation at 900 °C in an air atmosphere revealed that the compositions with x = 0.1 and x = 0.3 are characterized by a low mass gain, while for x = 0.5 the oxidation resistance drops sharply due to an increase in the specific surface area due to the increased specific surface area caused by the presence of cracks in the samples. The most balanced complex of properties is provided by the coating with the composition Al0.3CoCrFe0.2Ni. This work shows the prospects of using AlCoCrFeNi alloys with a reduced content of iron and aluminum for creating wear- and oxidation-resistant coatings.

Traditional welding methods are rarely used to join such material pairs due to their tendency to form brittle intermetallic compounds. One of the main parameters determining the quality of the weld is the impact angle gamma. The aim of the work is to study the influence of the impact angle on the temperature-strain characteristics in the joint zone during high-velocity impact of aluminum 1050A and steel 321 plates using numerical simulation. Research methods. The smoothed particle hydrodynamics (SPH) method implemented inAnsysAutodyn 2020 R2 software was used for the simulations. In all calculations, the contact point velocity was constant at Vc = 2,500 m/s, and the impact angle varied (9.5 degrees, 12 degrees, 14.5 degrees). The Mie-Gr & uuml;neisen equation of state and the Johnson-Cook constitutive model were used to describe the properties of the materials. Results and discussion. It was found that an increase in the impact angle leads to higher pressure, temperature, and plastic strain. Specifically, temperature and plastic strain increase monotonically with gamma, whereas pressure varies non-monotonically, reaching a peak of 8.87 GPa at gamma = 12 degrees. At gamma = 12 degrees, the most uniform interface is formed, and at gamma = 14.5 degrees, an asymmetrical interface with the penetration of steel into aluminum is observed. All studied impact conditions result in local melting of aluminum while keeping the steel solid. The most favorable of the investigated impact angles, which provides a beneficial combination of pressure, temperature, and interface morphology for the 1050A/321 system at a speed of 2,500 m/s, is 12 degrees.

This paper investigates the magnetic pulse welding (MPW) of commercially pure nickel and aluminum plates using a flat copper inductor scheme. The effect of impact angle (10° and 13°) and impact velocity on the interfacial microstructure, phase formation, and nanohardness was studied using optical microscopy, SEM, and TEM. The experimental results were correlated with smoothed particle hydrodynamics (SPH) simulations of the collision process and molecular dynamics (MD) simulations of atomic interdiffusion. The weld interface exhibited a transition from flat to wavy morphology with increasing impact velocity. The mixing zone had a nanograined structure with grain size mostly less than 100 nm, consisting of a nickel-in-aluminum solid solution with NiAl3 and NiAl intermetallic particles. SPH simulations revealed that the sample welded at 10° exhibited higher interfacial temperatures (1370–1910 K) compared to the 13° sample (1320–1580 K). This promoted the formation of intermetallics and increased nanohardness values to 2.6–3.2 GPa, compared to 1.7–2.7 GPa for the 13° sample. At the end of the weld in the 10° sample, the temperature of 1910 K exceeded the local melting point of nickel, forming a continuous interlayer with a nanohardness of 9.2 GPa. MD simulations, using SPH-derived temperatures as input, showed that interdiffusion coefficients range from 0.5 to 7 × 10−8 m2/s. The growth of the mixing layers is governed by atomic diffusion at the beginning of the welds, while mechanical mixing dominates at the end.

Исследовано сварное соединение из двух титановых пластин, полученное с использованием контактной схемы магнитно-импульсной сварки. Проведен структурный анализ сварного соединения с использованием методов световой микроскопии, растровой электронной микроскопии и микрорентгеноспектрального анализа. Установлено, что процессе сварки скорость соударения пластин непрерывно увеличивается от 450 до 650 м/с, что приводит к постепенному увеличению деформационных и тепловых эффектов. В зонах локального плавления на межслойной границе происходит значительное увеличение твердости. Численное моделирование с использованием метода гидродинамики сглаженных частиц адекватно воспроизводит основные особенности, характерные для магнитно-импульсной сварки, такие как образование струи и локальное плавление на межслойной границе.

With the continuous development of lightweight armor, there is an increasing demand for titanium and its alloys with enhanced mechanical properties and ballistic performance. The introducing of gradient nanostructure (GNS) offers a promising approach to enhance comprehensive mechanical properties and ballistic performance of titanium and its alloys. In the present research, GNS commercially pure titanium (CP Ti) was prepared using explosion hardening (EH) technique. Both experimental tests and numerical simulations were conducted to investigate ballistic performance of GNS CP Ti. Projectiles with different head shapes were used to perforate GNS CP Ti targets at different velocities, and ballistic curves were fitted. The microstructure of the projectile holes in the recovered targets was characterized by optical microscopy to analyze the failure modes. The experiment results show that the introducing of GNS effectively increases the ballistic limit velocity of CP Ti. After the introducing of GNS, the ballistic limit velocity of CP Ti increased by 5.8 %, 7.5 %, and 12 % under impact against ogival-nosed, hemisphere-nosed, and blunt-nosed projectiles, respectively. Microstructural analysis of the projectile holes indicates that the deformation of targets against blunt-nosed projectile is less than that against ogival-nosed projectile. Targets against ogival-nosed projectile absorbs more energy, resulting in a higher ballistic limit velocity than that against blunt-nosed projectile. A finite element model of GNS CP Ti was established using a layered modeling approach, and the simulation results were in good agreement with experimental findings. The enhanced mechanisms of ballistic performance of GNS CP Ti were revealed through both experiments and simulations. The target of GNS CP Ti can absorb more energy than untreated CP Ti under penetration. The GNS produced by EH treatment can not only improve the shear resistance of the target plate, but also redistribute the stress distribution in the target plate. Therefore, the GNS CP Ti target plate under blunt nosed shaped projectile has the strongest enhancement effect of ballistic performance.

Cu-Cr composites are extensively used as electrical contacts in vacuum circuit breakers due to their favorable electrical and mechanical properties. In this study, Cu-Cr composite coatings were formed on copper substrates by detonation spraying. Powder mixtures with chromium content ranging from 25 to 67 wt% were employed for the spraying process, and a pure copper coating was also prepared as a reference material. The microstructure and composition of the coatings were characterized using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) analysis. The performance of the coatings was assessed through arc erosion testing, and the post-test surface topography of the samples was analyzed via optical profilometry. TEM analysis revealed the presence of nanoscale copper oxides in the pure copper coatings and chromium oxides in the Cu-Cr coatings, respectively. The detonation-sprayed Cu-Cr coatings exhibited high hardness (240 +/- 10 HV) and adhesive strength (45 +/- 10 MPa), coupled with low porosity (< 1 %). The electrical conductivity of the coatings varied between 25 and 41 % IACS, depending on the chromium content. Notably, coatings with a chromium content of 33-43 wt% exhibited no surface protrusions after arc exposure, indicating superior resistance to arc-induced damage.

This study combines experimental and theoretical approaches to investigate the deformation and fracture behavior of welded steel samples. The experimental campaign involves systematic variations of key parameters, including testing temperatures and weld inclination angles, to gather a comprehensive dataset. Samples with notches and without notches are included to enhance the dataset's information content. The raw data is presented in its unprocessed form, suitable for model calibration and validation. As a demonstration example, a nonlocal ductile damage model is calibrated against the experimental data, and the challenges encountered during the calibration process are discussed. The fully calibrated damage model enables detailed end-to-end simulations of damage accumulation, crack initiation, and fracture. As a useful byproduct, the nonlocal damage model allows for the generation of an atlas of possible cracking patterns. The generated atlas includes both experimentally observed and theoretically predicted cracking patterns.

Austenitic stainless steels are widely regarded as the perfect choice of structural materials for application in harsh environments and at elevated temperatures. Nevertheless, their operating temperature is limited to 600 degrees C. To further improve the oxidation resistance, protective coatings are applied to their surfaces. In this study, we use nonvacuum electron beam cladding to form on the surface of AISI 321 steel a single-layer NiCrTi-based and a double layer NiCrTiB-based protective coatings. The effect of boron and chromium on microstructure and properties of produced coating was analyzed. The microstructure of the samples was characterized by light microscopy (LM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The properties of the coatings were determined through microhardness measurements and high-temperature oxidation tests. It has been established that cladding a mixture of Ni, Cr, and Ti resulted in the formation of a gamma-Fe solid solution and TiC particles within the coating. The addition of boron and chromium resulted in formation of Cr2B particles on the surface of the coating, which increased its hardness and oxidation resistance. Coatings containing chromium borides demonstrated 3 times higher hardness compared to AISI 321 steel and coatings which didn't contain boron and chromium. Thus, the oxidation resistance of NiCrTiB coatings increased by 4 times due to the formation of dense and continuous Cr2O3-based oxide films that prevented the diffusion of oxygen and ions of metals during the oxidation process.

Metallic glass-reinforced metal matrix composites (MMCs) are in the focus of attention of many research groups due to the outstanding properties provided by a combination of ductile crystalline matrix and high-strength glassy phase. To date, many fabrication techniques have been used to form such composites. Most of them are based on pressure-assisted sintering of glassy and crystalline components. However, the selection of the heating temperature and holding time is challenging due to the low thermal stability of the metallic glasses (MGs). In this study, a solid-state magnetic pulse welding (MPW) technique was used for manufacturing laminated Ti-based composites with Zr-based MG reinforcement. The structure of the interfaces between Ti and MG layers was studied using light microscopy (LM), scanning electron microscopy (SEM), and synchrotron X-ray diffraction (SXRD). The experimental study was supplemented with smoothed-particle hydrodynamics (SPH) numerical simulations. The Ti-MG-Ti composite obtained by MPW possessed high quality of joint and had no macroscopic defects such as cracks or lack of fusion. The formation of a firm joint was provided by the plastic flow of titanium. Deformation processes in the titanium plates developed mainly in the interfacial zones, while the MG ribbons subjected to deformation by shear mechanism through the entire thickness. Due to the short-term thermal impact and high cooling rates, MPW retained a disordered structure of MG, despite local melting occurring at the interfaces and in shear bands. Tensile tests of composites containing 5 vol. % and 13 vol. % of MG phase showed that their strength follows the rule of mixtures.

Non-vacuum electron beam cladding is a highly effective technology for producing protective coatings on metal workpieces. In this study, the 3.8 mm thick TiAl-based coating with Cr and Nb additions was obtained on the Ti alloy substrate in two passes of the electron beam. To evaluate inhomogeneity of the two-layer coating, energydispersive synchrotron X-ray diffraction (EDSXRD) in combination with energy-dispersive X-ray spectroscopy (EDX) was applied. It was found that in the direction from the top of the coating to the substrate, the dilution of the cladding layers with Ti increased. It influenced the phase constitution of the coating and led to a variation in the chemical composition of different phases (alpha 2-Ti3Al, beta-phase, and TiN). The properties of the first (lower) and the second (upper) cladding layers were evaluated separately. The upper layer exhibited greater oxidation resistance than the lower one due to the presence of the gamma-phase, which has superior high-temperature stability compared to the alpha 2-Ti3Al phase, predominant in the coating. The influence of varying chemical composition on the oxidation resistance was also estimated using density functional theory (DFT) simulations. It was found that decrease in Al content in the alpha 2 phase leads to an increase in oxygen absorption energy. This could potentially result in a decrease in oxidation resistance. Wear resistance of the first and the second cladding layers was at the same level mainly due to the low contribution of minor phases. Additionally, DFT simulations show that the variations in chemical composition of the major phase (Ti3Al) are not likely to impact the coating wear resistance.

The microstructure and mechanical properties of partially reacted and non-reacted Al–Fe66Cr10Nb5B19 metallic glass composites obtained by spark plasma sintering were comparatively analyzed. For the first time, the compositional features of core-shell particles formed upon the partial reaction of the Fe66Cr10Nb5B19 metallic glass with aluminum were examined using transmission electron microscopy combined with elemental mapping. The key finding is that iron of the alloy selectively dissolved in aluminum. The inner layer of the shell formed via diffusion of aluminum into the metallic glass. The introduction of the glassy reinforcement did not lead to such a dramatic ductility reduction as the formation of a complex “metallic glass core-thick intermetallic shell” reinforcement. In the non-reacted composite, the glassy reinforcement did not reveal its full potential in terms of the strengthening effect.

The paper presents an analysis of studies related to the monochromatization of X-ray radiation (XR) at synchrotron radiation sources. A review of monochromators based on of X-ray diffraction on crystals is given, and the peculiarities of their technical realization are considered. The ideas about monochromators which include multilayer structures are examined. The authors also study technical problems arising during designing devices and its possible solutions. Introduction. The possibilities of using X-rays in scientific research are described. The high efficiency of synchrotron radiation sources is noted, and its characterization is given. Elementary information about diffraction of X-rays. The paper describes the properties of X-ray radiation and the possibilities of its using while studying various materials. Degree of monochromaticity. The degree of monochromaticity is an important characteristic of the synchrotron radiation (SR). Depending on the width of the wavelength band, “white”, “pink” and monochromatic beams are distinguished. Monochromators based on multilayer structures are used to obtain “pink” beams. Monochromatic radiation is formed using monocrystals. When conducting experiments with “white” beams, the monochromator is not used. The authors also describe the factors that violate the ideal fulfillment of the Wolf-Bragg condition and affect the degree of monochromaticity (heat, vibration). The reflectivity values at different beam grazing angles are noted to have different widths. Monochromators based on multilayer structures. Periodic structures combining thin layers of two heterogeneous materials make it possible to obtain “pink” beams. The wavelength bandwidth of such devices is one or two orders of magnitude greater than that of monochromators using crystals as optical elements. Configurations and geometry of optical elements. There are two types of X-ray diffraction on a crystal: Bragg and Laue diffraction. Bragg diffraction refers to reflective geometry, Laue diffraction is based on the passage of beams through the crystal. The section provides examples of monochromators with different configurations of crystals and X-ray mirrors. The arrangement of optical elements in a monochromator plays an important role in the geometry of the beam path. When designing monochromators, it is necessary to take into account the methods of fixation and orientation of the rotation axes of optical elements. Examples of monochromators with different configurations of crystals and X-ray mirrors are given. Focusing monochromators. It is possible to provide sagittal and meridional types of deformation by bending the optical element of the monochromator. Due to the curved crystal surface the beam is not only monochromatized but also subjected to focusing. Modern focusing monochromators are equipped with adaptivity elements allowing it to change the radius of curvature of the optical element. Examples of practical realization of such monochromators are presented. Thermal load of SR on optical elements. The SR is characterized by high brightness and a wide spectrum of emitted wavelengths. While operating optical elements of SR stations absorb a large amount of thermal power. The problems of heat dissipation have a fundamental influence on the quality of synchrotron radiation monochromatization. Additional information about monochromators. Examples of special design solutions for monochromators are given. Conclusion. The design of monochromators is relevant to the synchrotron radiation source 4+ “SKIF” under construction in Novosibirsk.

When choosing compositions of high-entropy alloys, one of the parameters taken into account is thermal stability. The paper considers the structural transformations of the deformed Al 0.3 CoCrFeNi high-entropy alloy occurring during its annealing. The material was obtained by argon-arc melting with a mixture of pure single-element components. In order to homogenize the structure, the resulting ingot was subjected to thermomecha­nical processing according to a scheme combining cold rolling with a compression ratio of 50 % and low-temperature annealing (400 °C for 100 h). In the future, the homogenized billet was rolled in a cold state with a compression ratio of 80 %. The structure of the materials was studied directly during heating ( in-situ mode) using the method of synchrotron X -ray diffraction. The heating rate of the samples was 20 °C/min, the maximum heating temperature was 1000 °C. The parameters of the alloy dislocation structure (density of screw dislocations, spatial distribution of dislocations) during heating were determined using the modified Williamson–Hall and Warren–Averbach methods. According to the data obtained, the temperature of beginning of formation of a high-entropy phase with a primitive cubic lattice is 560 °C. In the process of heating the material up to this temperature, an increase in density of screw dislocations and formation of a disordered dislocation structure are observed. The nature of change in dislocation density correlates well with the increase in the alloy microhardness. At an initial value of 406 ± 13 HV 0.1 (for the deformed material), the microhardness during heat treatment increases up to 587 ± 10 HV 0.1 .

In this study, alumina–zirconia ceramics with ZrO2 components obtained using different methods were investigated. Synthesized undoped ZrO2 powder, commercial powder of ZrO2, doped with 3 mol

Detonation spraying is commonly used to form protective and functional coatings. The influence of the temperature and velocity of spraying particles on the quality of the coatings is frequently analyzed by the study of single splats. However, to date, there has been limited research on the interaction and structure formation at the splat/substrate interface during detonation spraying. In this paper, copper splats and coatings were formed on steel substrates using three different spraying modes: ‘cold’, ‘normal’, and ‘hot’. The features of the particle/substrate interaction were studied experimentally and by numerical simulation using the smoothed particle hydrodynamics (SPH) method. The simulation revealed the deformation and temperature history of the particles and substrate during impact. The structure of the splats and coatings was characterized using scanning electron microscopy (SEM) and synchrotron X-ray diffraction (SXRD). The microstructure of the coatings sprayed in the ‘normal’ and ‘hot’ modes consists of columnar crystals, indicating complete melting of the particles. The coating obtained in the ‘cold’ mode consists of a mixture of molten, partially molten, and unmolten particles. SXRD analysis revealed an increase in dislocation density in the sprayed coatings compared to the initial powder. The sprayed material mainly contains screw dislocations, while the initial powder predominantly contains edge dislocations. The approach used, combining materials characterization techniques and numerical simulation, has great potential for analyzing the coating formation process and can be applied to the optimization of thermal spraying parameters of various materials. The results of this study may be of interest to other researchers working in the field of thermal spraying of copper-based alloys.

Over the next decade, the extremely brilliant fourth generation synchrotron radiation sources are set to become a key driving force in materials characterization and technology development. In this study, we present a conceptual design of a versatile "Materia" diffraction and imaging beamline for a low-emittance synchrotron radiation facility. The beamline was optimized for operation with three main principal delivery regimes: parallel collimated beam ∼1 mm beam size, micro-focus regime with ∼10 μm beam spot size on the sample, and nano-focus regime with <100 nm focus. All regimes will operate in the photon energy range of 10-30 keV with the key feature of the beamline being fast switching between them, as well as between the various realizations of diffraction and imaging operation modes while maintaining the target beam position at the sample, and with both spectrally narrow and spectrally broad beams up to the energy band ΔE/E of 5 × 10-2. The manuscript presents the details of the principal characteristics selected for the insertion device and beamline optics, the materials characterization techniques, including the simulations of thermal load impact on the critical beamline optics components. Significant efforts were made to design the monochromators to mitigate the very high beam power load produced by a superconducting undulator source. The manuscript will be of interest to research groups involved in the design of new synchrotron beamlines.

Introduction. Vacancies are among the crystal lattice defects that have a significant effect on the structural transformations processes during thermal, chemical-thermal, thermomechanical, and other types of alloys treatment. The vacancy formation energy is one of the most important parameters used to describe diffusion processes. An effective approach to its definition is based on the use of the density functional theory (DFT). The main advantage of this method is to carry out computations without any parameters defined empirically. The purpose of the work is to estimate vacancy formation energy of BCC-, FCC- and HCP-metals widely used in mechanical engineering and to compare these findings obtained using various exchange-correlation functionals (GGA and meta-GGA). Computation procedure. The computations were carried out using the projector-augmented wave method using the GPAW code and the atomic simulation environment (ASE). The Perdew-Burke-Ernzerhof, MGGAC and rMGGAC functionals were used. The wave functions were described by plane waves within simulations. Vacancies formation energy was evaluated using supercells approach with a size 3 × 3 × 3. Computations were carried out for BCC-metals (Li, Na, K, V, Cr, Fe, Rb, Nb, Mo, Cs, Ta, W), FCC-metals (Al, Ni, Cu, Rh, Pd, Ag, Ir, Pt, Au, Pb, Co) and HCP-metals (Be, Ti, Zr, Mg, Sc, Zn, Y, Ru, Cd, Hf, Os, Co, Re). Results and discussion. A comparison of the defined vacancy formation energies indicates the validity of the following ratio of values: . The values obtained using the open source GPAW code are characterized by the same patterns as for widely spread commercially distributed program VASP. It was revealed that the use of the PBE and MGGAC functionals leads to a slight deviation relative to the experimentally determined vacancies formation energy in contrast to the computations using rMGGAC.

In present work, the possibility of fabricating a composite cold-sprayed coatings consisting of partially amorphous alloy reinforcing particles and an aluminum matrix was studied for the first time. A mixture of pure aluminum and SHS7574 powders in a ratio of 50/50 wt% was deposited on aluminum alloy substrates, which ensured the formation of high-quality coating with a porosity of less than 1%. The ratio of SHS7574 alloy to aluminum in the as-sprayed samples was nearly the same as in the initial powder mixture which indicates a similar efficiency of component deposition. Composite coatings were annealed in a vacuum furnace at 540 degrees C and 600 degrees C. Microstructure and phase composition of as-sprayed and annealed coatings were examined with XRD, SEM and EDX mapping. Post annealing of the coatings promoted the formation of a reaction layers around the Fe-based alloy particles consisting of Fe2Al5, Fe4Al13, Fe23B5, and Fe5C2 phases. The effect of annealing on the mechanical properties of the Al-SHS7574 coatings was determined by measuring hardness, nanohardness and wear resistance according to ASTM G 133-05. The increase in the samples' hardness after annealing was associated with the formation of a reaction layers and increase in its thickness with rising annealing temperature. The coating annealed at 600 degrees C demonstrated the highest hardness due to the formation of thick brittle reaction layers. The preservation of the aluminum matrix with the simultaneous formation of thin reaction layers after annealing at 540 degrees C reduced the wear rate of the coating despite the moderate hardness.

In this study, Al21Co22Cr22Fe13Ni22 high-entropy coatings were produced on steel substrates by non-vacuum electron beam cladding of Co, Cr, and NiAl powders. The high-temperature oxidation behavior of the coatings was studied by holding the specimens at 900 °C in air. The microstructure and phase constitution of the samples were studied both in the as-cladded state and after the heat treatment. The microstructure was characterized using light microscopy (LM) and scanning electron microscopy (SEM). Synchrotron X-ray diffraction (SXRD) and energy-dispersive X-ray spectroscopy (EDX) were used to study the phase constitution of the coatings and the “coating-substrate” interface. The coating consisted of disordered bcc (A2), ordered bcc (B2), and disordered fcc (A1) phases. Annealing the coatings for 50 h at 900 °C led to the formation of fcc precipitates in the bcc dendritic grains and a mixture of fcc and σ-phase particles in the interdendritic regions. Needle-like nanosized B2-precipitates were formed due to annealing in the fcc grains at the coating/substrate interface. The microhardness at the top of the as-cladded coating was 585 HV and gradually decreased towards the substrate. A more uniform distribution of the microhardness was obtained after the annealing. Its average value was 441 HV. Rhomboid Cr2O3, needle-like Al2O3, and spinels of a different morphology were found on the surface of the samples after oxidation at 900 °C.

Introduction. High-entropy alloys (HEAs) belong to a new and promising class of materials that are attracting the attention of both scientists and engineers from all over the world. Among all alloys of the AlxCoCrFeNi system, HEAs with x ≤ 0.3 attract special attention. Materials with this composition are characterized by the presence of only one phase with a face-centered cubic lattice (FCC). Such alloys have high ductility, excellent corrosion resistance and phase stability at high temperatures. The purpose of this work is to compare several methods of profile analysis on the example of plastically deformed ingots of a high-entropy Al0.3CoCrFeNi alloy. The methods of investigation. Using several methods of profile analysis of X-ray diffraction patterns, the structures of the cold-worked high-entropy alloy Al0.3CoCrFeNi are studied. In addition to the classical Williamson-Hall method, the analysis was carried out using a modified one, as well as a method that takes into account the anisotropy of the elastic properties of the crystal lattice. Research material. Ingots of the high-entropy Al0.3CoCrFeNi alloy deformed by cold rolling with a maximum reduction ratio of 80% were used as the object of the study. Samples were cut from the obtained blanks, which were studied by the method of synchrotron radiation diffraction according to the “transmission” scheme along two (longitudinal (RD) and transverse (TD)) directions of rolled products. Results and discussion. It is shown that the use of the classical Williamson-Hall method leads to a significant error in the approximation of experimental results. The modified Williamson-Hall method has the smallest approximation error and can be recommended for studying the Al0.3CoCrFeNi alloy. An analysis of deformed samples using this method made it possible to reveal several features of the formation of defects in the crystalline structure, which are in good agreement with the classical concepts of the mechanisms of plastic deformation. First, an increase in the degree of deformation of the high-entropy Al0.3CoCrFeNi alloy leads to an almost uniform increase in the number of twins and stacking faults. Secondly, with an increase in the degree of reduction, there is a decrease in the fraction of edge dislocations and an increase in the fraction of screw dislocations in the material. The results obtained correlate well with the results of microhardness measurements.