Abnormally high strength and low electrical resistivity of the deformed Cu/Mg-composite with a big number of Mg-filaments

Cu/Mg-composites, the copper matrix of which contains 1, 7 and 2730 magnesium filaments, were obtained by hyrdoextrusion at room temperature. The structure, mechanical and electrical properties of the deformed composite rods and thin wires were investigated. The yield strength and electrical resistivity were theoretically calculated and these estimations were compared with the experimental results. The XRD-method allowed discovering a change of the lattice constant of the Cu-matrix under deformation of the composites. It has been concluded that, under severe plastic deformation, a supersaturated Cu-based solid solution forms on the Cu/Mg-interface. As a result, the strength of the deformed Cu/Mg-composite with minimal volume fraction but maximal surface area of magnesium is abnormally high. A thick Cu-sleeve provides low electrical resistivity of this Cu/Mg-composite. The obtained results can be used for the development of high-strength Cu-based conductors. © 2019 The AuthorsUral Branch, Russian Academy of Sciences, UB RASThe work was carried out in the framework of a state task according to the theme ?Pressure? No. AAAA-A18-118020190104-3. The studies of structure and mechanical properties of the samples were carried out at the Electron Microscopy Department and Mechanical Test Department of the Collective-Use Center of the Institute of Metal Physics (Ural Branch, Russian Academy of Sciences). The X-ray diffraction studies were carried out in the ?Composition of Compounds? Center of Collaborative Access, Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences

Theoretical estimation, simulation and experimental evaluation of deformation-induced heating of magnesium during lateral extrusion

Theoretical estimation, computer simulation and experiment were performed to evaluate temperature of the deformation heating of magnesium during severe plastic deformation by lateral extrusion method. The simulation of the deformation process was carried out by DEFORM-3D. Experimental temperature measurement of magnesium deformation-induced heating at the deformation zone was made. According to the simulation, temperature of the magnesium billet has reached 114°C during deformation. Experimental results showed that the maximum temperature of deformation heating of the material is ~ 140°C. © 2020 Institute of Physics Publishing. All rights reserved.The work was carried out with the financial support of the Russian Foundation for Basic Research (RFBR). The experimental part and math estimation were performed within the framework of RFBR project No. 18-33-00474. Computer simulation was carried out within the framework of RFBR project No. 20-38-90051

ANALYSIS OF MAGNESIUM DEFECTIVENESS AFTER DEFORMATION AT THE ROOM TEMPERATURE

We conducted experiments on precipitation of pure magnesium samples in a copper cage at different degrees of deformation in order to reveal the mechanisms responsible for grain refinement during deformation. With a deformation of 15%, the initial structure is milled and microcracks are formed, but with deformation of 50% no cracks are detected, from which it can be assumed that fractures are healed.Работа выполнена в рамках государственного задания ФАНО России (тема "Давление"), при финансовой поддержке проекта УрО РАН №18-10-2-24 и проекта РФФИ №18-33-00474

Theoretical estimation, simulation and experimental evaluation of deformation-induced heating of magnesium during lateral extrusion

Abstract Theoretical estimation, computer simulation and experiment were performed to evaluate temperature of the deformation heating of magnesium during severe plastic deformation by lateral extrusion method. The simulation of the deformation process was carried out by DEFORM-3D. Experimental temperature measurement of magnesium deformation-induced heating at the deformation zone was made. According to the simulation, temperature of the magnesium billet has reached 114°C during deformation. Experimental results showed that the maximum temperature of deformation heating of the material is ∼140°C.</jats:p

European educational system and problems of higher education in Russia

Антропова Е.В., преподаватель кафедры физического воспитания, Южно-Уральский государственный университет (Челябинск); тел.: 8-351- 2679017; e-mail: [email protected] Antropova E.V., the teacher of chair of physical training of South Ural State University (Chelyabinsk); ph.: 8-351-2679017; e-mail: [email protected]. Викторов Д.В., кандидат педагогических наук, доцент, преподаватель кафедры физического воспитания, Южно-Уральский государственный университет (Челябинск); тел.: 8-351-2679017; e-mail: [email protected]. Viktorov D.V., the candidate of pedagogical sciences, associate professor of physical education department of South Ural State University (Chelyabinsk); ph.: 8-351-2679017; e-mail: viktorovdv® yandex.ru. Ком ко в а И.А., доцент кафедры физического воспитания, Южно-Уральский государственный университет (Челябинск); тел.: 8-351-2679017; e-mail: [email protected] Komkova I.A., associate professor of physical education department of South Ural State University (Chelyabinsk); ph.: 8-351-2679017; e-mail: olvk@ susu.ac.ruИзменение ценностей и потребностей современного общества требует корректировки целей и задач профессионального образования, новых подходов к организации педагогического процесса в высшей школе, так как подготовка молодых специалистов более чем на две трети не соответствует существующему и перспективному спросу на рынке труда. Changing values and needs of modern society require an adjustment of goals and objectives of vocational education, new approaches to the organization of the pedagogical process in higher education, because training of young professionals on more than two-thirds does not meet existing and future demand at the labor market