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Registration Number

0219U101840, 0114U003942 , R & D reports

Title

Multicomponent melts for the creation of highentropy alloys: thermodynamic properties, phase equilibria, fundamental principles of development.

Head

Turchanin Mykhailo A., Доктор хімічних наук

Registration Date

14-11-2019

Organization

Donbass State Engineering Academy

Description

Subjects of investigations: thermodynamic properties of phases of Co−Cr−Cu−Fe−Ni and Cu−Ni−Ti−Zr−Hf systems. Objectives: modeling of phase transformations and thermodynamic properties of phases; determination of the regularities of the change in the thermodynamic properties of the melts in the range of the investigated systems; determination of causes and factors influencing the formation of amorphous and crystalline high-endurance alloys (HEA); calculation of phase transformations and thermodynamic properties of phases of Cu−Ni−Ti−Zr−Hf and Co−Cr−Cu−Fe−Ni systems and prediction of technological conditions for the production of amorphous and crystalline HEA. Research methods: the model of the associated solution for modeling the temperature-concentration dependence of the thermodynamic properties of the melts; CALPHAD method for calculating stable and metastable phase transformations and thermodynamic properties of phase systems. Results: new experimental data on the thermodynamic properties of the melts of glass forming systems; the thermodynamic description of the Cu–Hf–Ti system was developed first for the first time and the isothermal and polythermal sections, projections of surfaces of liquidus and solidus were calculated; models of thermodynamic properties of phases of Co−Cr−Cu−Fe−Ni and Cu−Ni−Ti−Zr−Hf systems have been developed; diagrams of equilibrium and metastable phase transformations of equiatomic alloys of Co−Cr−Cu−Fe−Ni and Cu−Ni−Ti−Zr−Hf systems are calculated; the factors pointing to the possibility of formation of amorphous and crystalline HEA are determined; developed databases that can be used to predict the concentration ranges of amorphization of metal melts and production of HEA. Range of application: metallurgical production and production of finished metal products. Research and development on natural sciences and engineering.

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