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Information × Registration Number 0223U002311, 0118U001038 , R & D reports Title Influence of competition after a mechanism phasetransformations is on functional properties of multicomponentеквіатомних of metallic materials popup.stage_title Head Koval Yurii Mykolayovych, Доктор технічних наукFirstov Georgiy S., Доктор фізико-математичних наук Registration Date 14-02-2023 Organization Institute of Metal Physics. G.V. Kurdyumov of the National Academy of Sciences of Ukraine popup.description2 CRYSTAL STRUCTURE, ELECTRONIC STRUCTURE, INTERMETALLIC COMPOUNDS, HIGH ENTROPY ALLOYS, PHASE TRANSFORMATION, MARTENSITIC TRANSFORMATION, ALLOYING, SHAPE MEMORY EFFECT, MAGNETIC SHAPE MEMORY. The object of research - high-entropy alloys with shape memory effect: MnFeCoNiCu, TiZrHfNbTa, TiZrHfCoNiCu, CoNiCuAlGaIn; alloys with shape memory effect based on elements of IVb and Vb groups of the periodic system of elements (Ti, Zr, Hf, Nb and Ta): Zr-Ta, Hf-Nb, Zr-Nb-Me; NiMnGa alloys with magnetic shape memory. The purpose of the work is to create the physical principles of controlling the structure and properties of multicomponent intermetallic compounds and solid solutions undergoing phase transformations. Research methods – electron and optical microscopy, X-ray structural analysis, resistometry, calorimetry, dilatometry, special methods for measuring deformation characteristics. Directions for improving high-temperature alloys with shape memory were developed, what has led to the creation of fundamentally new functional materials - high-entropy alloys with shape memory. The results of modeling of the electronic structure in combination with the analysis of the crystal structure using the refinement of the Rietveld experimental data performed for TiZrHfCoNiCu intermetallics are presented. Using a multicomponent approach, basing on the NiAl prototype a high-entropy intermetallic compound CoNiCuAlGaIn was developed. This new alloy is characterized by the B2 phase and martensitic transformation, as well as excellent as-cast strength. In the long term, this new approach could lead to a breakthrough for shape memory alloys in general. It is shown that the TiZrHfCoNiCu system exhibits strong dendritic liquation, which leads to the formation of martensite crystals inside the dendrites. On the contrary, in the CoNiCuAlGaIn system, dendritic liquation allows martensite crystals to form only in the interdendritic regions. Product Description popup.authors Bublei Yrina Kedrovskyi Sergii M. Koval Yurii Mykolayovych Kosorukova Tetiana Oleksandrivna Kudryavtsev Yurii Lihachev Olexander Lobodiuk Valentyn A. Makarenko Sergiy Yu. ODNOSUM VALERII V Svystunov Yevhen O. Sych Tetiana Grygoriivna Slepchenko Victoria Firstov Georgiy S. popup.nrat_date 2023-02-14 Close