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Information × Registration Number 0225U001623, (0122U000970) , R & D reports Title Thermodynamics of multicomponent melts of transition metals as a scientific basis for the de-velopment of amorphous alloys. popup.stage_title Експериментальне дослідження ентальпій змішування розплавів Co–Zr–Hf та Ni–Zr–Hf. Термодинамічний опис системи Co–Ti–Hf. Створення узагальненої термодинамічної бази даних для рідких і твердих розчинів систем Co– Cu−Ni−Ti−Zr та Co–Cu−Ni−Ti−Hf і її використання для розрахунків. Узагальнення результатів і встановлення факторів, що впливають на утворення аморфних сплавів в системах Co– Cu–Ni–Ti–Zr та Co–Cu– Ni–Ti–Hf. Розробка остаточних висновків і складання заключного звіту. Head Turchanin Mykhailo A., Доктор хімічних наук Registration Date 04-02-2025 Organization Donbass State Engineering Academy popup.description1 The purpose of this work is to еstablish the physicochemical properties of metallic melts of model multicomponent Co−Cu−Ni−Ti−Zr and Co−Cu−Ni−Ti−Hf systems, determine their dependence on the composition, temperature, and a number of system components, and identify physicochemical factors that determine their glass forming ability under conditions of nonequilib-rium synthesis. The following investigations will be performed: experimental calorimetric inves-tigation of mixing enthalpy of melt components, modeling of temperature-concentration depend-ence of their thermodynamic mixing functions in the framework of associate solution model, de-velopment of thermodynamic database for calculations of thermodynamic properties of phases and diagrams of equilibrium and metastable phase transformations in the framework of CALPHAD-method, development of maps of concentration regions of amorphization of multi-component melts. popup.description2  Subjects of investigations: liquid alloys of the Co–Ni–Zr and Co–Ti–Hf systems, liquid alloys and crystalline phases of the Co–Ti–Hf system. Objectives of investigations: experimental investigation of the mixing enthalpy of liquid alloys of the Co–Ni–Zr and Co–Ti–Hf systems; theoretical modeling of the thermodynamic properties of liquid alloys Co–Ni–Zr and Co–Ti–Hf systems; development of a thermodynamic database for multicomponent liquid alloys and boundary solid solutions of the Co–Cu−Ni−Ti−Zr and Co–Cu−Ni−Ti−Hf systems, modeling of the thermodynamic properties of their melts, calculation of diagrams of metastable phase transformations; new thermodynamic assessment of the Co–Ti–Hf system; summarizing of the results, writing of the final report. Methods of investigations: high-temperature calorimetry; modeling of thermodynamic properties of phases within the framework of mathematical models and the associate solution model; CALPHAD method for calculating phase equilibria. Results of investigations, obtained for the first time: the mixing enthalpies of Co–Ni–Zr and Co–Ti–Hf liquid alloys; the temperature-composition dependence of the thermodynamic properties of the Co–Cu−Ni−Ti−Zr and Co–Cu−Ni−Ti−Hf liquid alloys; diagrams of metastable phase transformations involving supercooled liquid alloys of the Co–Cu−Ni−Ti−Zr and Co–Cu−Ni−Ti−Hf systems. A new thermodynamic description of the Co–Ti–Hf system was developed, including isothermal and polythermal cross sections and projections of the liquidus and solidus surfaces. All results were analyzed to determine the physicochemical factors that enable multicomponent melts of transition metals to form amorphous alloys under non-equilibrium conditions. Range of application: investigations in the field of physicochemical theory of melts and phase equilibria; development of new technologies for the synthesis of amorphous and high entropy alloys; research and development in the field of chemical and physical materials science. Product Description popup.authors Ahraval Pavlo H. Vodopianova Hanna O. Dreval Liia O. Korsun Vladyslav A. Sincha Polina А. Sarana Kateryna S. Turchanin Mykhailo A. Usenko Nataliia I. popup.nrat_date 2025-02-04 Close