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Featured articles represent high-quality research with the greatest potential for broad impact in the field. Thematic articles are submitted by invitation or approved by scientific editors and reviewed before publication.
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A feature article can be an original research article, a case study that often involves multiple methods or techniques, or a review article that provides a short and precise update on progress in a field that systematically highlights interesting scientific advances. books This type of paper provides an overview of future areas of research or applications.
Editor’s Choice articles are based on the preferences of scientific journal editors from around the world. Editors select a small number of recently published journal articles that they believe will be of most interest to authors, or are most important for that matter. Its purpose is to provide an overview of some of the most interesting publications in the various research sections of the journal.
And Boris B. Straumal 1, 2, * , Roman Kulagin 1 , Brigitte Baretskyi 1 , Nataliya Yu. Anisimova 2, 3, Mykhailo Vasyliovych Kyselevskyi 2, 3, Leonid Klinger 4, Petro B. Straumal 5, Olga A. Kogtenkova 2 and Ruslan Z. Valiev 6
N.N. Blokhin Ministry of Health of the Russian Federation (N.N. Blokhin National Medical Center), 115478 Moscow, Russia
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Institute of Physics of Prospective Materials of the Ufa State Aviation Technical University (UGATU), str. 12, 450000 Ufa, Russia
Received: December 12, 2021 / Modified: December 25, 2021 / Accepted: December 28, 2021 / Published: December 31, 2021
This review focuses on technology that fits into three major areas of materials science. These are phase transitions, highly plastic transitions (SPD) and high entropy alloys (HEA). First, SPD allows to determine the limits of the components of one component for the presence of a solid multicomponent solution in the VES. The most important feature of SPD is that with the help of these technologies, it is possible to obtain secondary layers of nanoparticles that are part of the matrix with a grain size of several tens of nanometers. Such materials have a very low density of internal boundaries. These boundaries act as fast diffusion processes. Thanks to the annealing of the wind turbine under the IPD, it is possible to accurately determine the limit temperature of the single-component solid state in the multi-component films of the wind turbine. Second, the SPD itself induces phase changes in the HEA. Some of these changes are the degradation of one stable phase and the formation of nanoparticles of the second phase, the formation of high-density structures, amorphization, and spinodal decomposition. Thirdly, during IPD, a large number of new grain boundaries (GBs) are formed due to the reorganization of crystallites. Discrimination zones are available on these new GBs. The number of components in a GB is different from the number of components in a solid mass system. Due to the formation of many new GZs, atoms leave the volume of the solution and form separate layers. Therefore, the composition of the solid solution in the volume also changes. All these methods make it possible to purposefully influence the structure, composition and useful properties of VES, especially in medicine.
High-entropy alloy; high plastic deformation; rain; phase change; phase images of a high-entropy alloy; high plastic deformation; rain; phase change; image parameters
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This article is at the intersection of three major areas of materials science. These are phase transitions, high plastic deformation, SPD (and in particular high shock, HPT), and multicomponent alloys without a large component (also called high performance alloys, HEAs). Each of these areas is very large: thousands, and if the parameters are changed, thousands of records are assigned to them. However, their cross-sectional area is not very large and is available for demonstration. In this case, we are not talking about their simple, machine-made form. All three regions, crossing with each other, not only cross each other, but also cause things like fertilization (or pollination). It seems to us that in the near future such combined research will be of great interest and will bring not only unusual results, but also great progress in materials science.
An essential feature of VE is that atoms of five, six or more elements form one solid, stable and homogeneous solution [1, 2, 3, 4]. This solid solution is already formed during solidification, and after homogenization annealing, it loses all residual inhomogeneities. However, an important question arises: how much heat does the same solid body remain thermodynamically stable? In other words, at what temperature does the gas of the second phase begin to turn into a solid state? It would seem that the answer to this question is simple: you need to bake for a long time at different temperatures, and then measure and interpret the X-ray diffraction pattern (XRD). However, if the formation of the second phase begins with the expansion of the volume and is determined by its volume, then such an output is required for a very long time. For example, a similar direct test of the equiatomic Cantor alloy CoCrFeMnNi, which has a lattice core (fcc) γ-phase, was conducted in only one paper . The authors  homogenized samples of the Cantor alloy at 1200 °C for 2 h, and then annealed at 900, 700, and 500 °C for 500 days; after heating at 900 °C, the alloy remained homogeneous. At a temperature of 700 °C, particles of the σ-phase, rich in chromium, formed in it. However, the particles appeared mainly at the grain boundaries (GBs) of the fcc matrix (see Figure 1). At 500 °C, in addition to the σ-phase particles, dots with a cubic (bcc) lattice rich in nickel and manganese also appeared on the GB (see Fig. 2).
Fortunately, experiments investigating the limits of the existence of a single stable information region in HEAs can be greatly supported as well-seeded samples and thus large real GB sites are created. In this case, the growth of the second phase of precipitates will be controlled by GB rather than bulk diffusion, and thermodynamic equilibrium can be reached very quickly. Fine grains in VEA can be obtained using the so-called high plastic deformation (HPD), in particular, high pressure (HP), equiangular compression (EKSP) or hot sintering [6, 7, 8, 9, 10, 11]. , 12, 13, 14, 15, 16, 17]. Thus, TiZrNbMoV and NbTiAlTaV HEAs after thermopress sintering, which contain a small amount of complex metals such as Mo in addition to the solid solution.
Zr . In several studies, Cantor alloys were deformed by HPT or ECAP. After IPD, polycrystals with a grain size of 10-20 nm were synthesized within a short time at various temperatures from 200 to 900 °C [5, 18, 19, 20, 21, 22, 23, 24]. Simultaneously with grain growth, particles of the σ- and bcc-phases quickly appeared on the GZ of such samples. Figure 3 shows an X-ray pattern of Kantor alloy after KVD (6 GPa, 5 rpm, 1 rpm) and short-term annealing (60 min) .
Figure 4 summarizes the results of such works [5, 18, 19, 20, 21, 22, 23, 24]. It can be seen from the graph that the bcc phase is present in the Cantor alloy at a temperature below 800 ° C. The bcc phase was observed even when heated to 200 ° C. Therefore, the region of the presence of the bcc phase does not have a low temperature limit. On the contrary, the σ-phase exists in the lower temperature range. The σ-phase appears at about 800 °C and disappears again below 450 °C. A similar phenomenon is often observed for σ-phases in binary alloys (for example, iron-chromium). In binary alloys, the σ-phase is usually between metals, one of which has an bcc lattice and the other an fcc lattice, and the difference in the diameters of the atoms of the metals included in the σ-phase does not exceed 8%. . The σ-phase has a complex tetragonal crystal lattice with a unit cell of 30 atoms, similar to the crystal lattice of uranium. The σ-phase is usually characterized by a large area of homogeneity.
When the ratio of nickel to chromium changes, the σ component is present up to high temperatures [25, 26]. In particular, this is observed after 1050 °C for 24 h . In another modified alloy, Cantor, Co
, the σ component is not observed after homogenization at 900
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