Abstract
Theoretical bases for the calculation of metastable phase transformations with the participation of supercooled multicomponent melts in the framework of the CALPHAD method are considered. A database with parameters for models of thermodynamic properties of phases in the Cu–Ni–Ti–Zr–Hf system for such calculations is presented. The excess term of the Gibbs energy of liquid alloys is described using the associated solution model, and bcc and fcc solid solutions with a mathematical model with Redlich–Kister polynomials. The diagrams of metastable phase transformations with the participation of supercooled liquid alloys and boundary solid solutions are calculated. The composition ranges for obtaining rapidly quenched and bulk amorphous ternary, quaternary, and quinary alloys of the Cu–Ni–Ti–Zr–Hf system are theoretically assessed.
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