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Information × Registration Number 0220U104238, 0120U103597 , R & D reports Title Physical mechanisms of plastic deformation of nanostructured high entropy alloys FeCrCoNi and FeCrCoNiС with improved ratio “strength – plasticity” in temperature range 300–0.5 K popup.stage_title Head Semerenko Yuri O., Кандидат фізико-математичних наук Registration Date 15-12-2020 Organization B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine popup.description2 The object of study is high-entropy alloys based on the Fe-Cr-Co-Ni system. The research work «Physical mechanisms of plastic deformation of nanostructured high entropy alloys FeCrCoNi and FeCrCoNiС with improved ratio “strength – plasticity” in temperature range 300–0.5 K» is carried out jointly with the Department of Materials Science and Engineering, Pohang University of Science and Technilogy (POSTECH), Republic of Korea, within the framework of scientific cooperation between the Ministry of Education and Science of Ukraine and the National Research Foundation of the Republic of Korea. The purpose of the work is a complex experimental study of the physico-mechanical properties of low-temperature plastic deformation, elastic and dissipative characteristics, microstructure and phase state of Co17.5Cr12.5Fe55Ni10Mo5 alloy in various structural states in a wide range of cryogenic temperatures of 300 - 0.5 K. Research methods - active plastic deformation in the temperature range 0.5-300 K, measurement of dynamic modulus of elasticity and acoustic absorption in the temperature range 4.2-350 K, electron microscopy and X-ray diffraction analysis, theoretical calculations by RCMSE and MFDFA methods. The work was aimed at studying the influence of m – precipitates (Mo-enriched phase) on low-temperature physical and mechanical characteristics of Co-Cr-Fe-Ni-Mo alloys. The main attention was focused on the study of the average entropy alloy Co17.5Cr12.5Fe55Ni10Mo5 whose composition was determined as optimal. The high cryogenic strength of the Co17.5Cr12.5Fe55Ni10Mo5 alloy, which is accompanied by high ductility, allows us to consider this material promising for cryogenic applications. The obtained results are important for practical applications of high-entropy alloys at low temperatures.   Product Description popup.authors popup.nrat_date 2020-12-15 Close