Thermodynamics and Chemical Ordering of Glass-Forming Liquid Cu–Co–Ni–Ti–Zr, Cu–Co–Ni–Ti–Hf Alloys

DOI: 10.62564/M4-PA1140

Mykhailo Turchanin¹, Pavlo Agraval¹, Liya Dreval^1,2, Anna Vodopyanova<sup>1

1</sup>Donbas State Engineering Academy, Ukraine
²MSI, Materials Science International Services GmbH, Stuttgart, Germany


Metallic glasses have attracted much attention from materials science researchers. At the same time, finding new compositions of multicomponent metallic glasses by trial-and-error method requires significant costs and efforts associated with conducting experimental research. Therefore, to search for new promising compounds, scientific forecasting methods should be used, among which the thermodynamic approach occupies an important place. In this work, the results of calculating the temperature-composition dependence of the thermodynamic mixing functions of equilibrium and supercooled Cu–Co–Ni–Ti–Zr and Cu–Co–Ni–Ti–Hf liquid alloys are presented, and the chemical short-range ordering in them, are discussed. The obtained results were used to predict the composition regions of glass formation. A database containing interaction parameters for boundary binary and ternary systems was used for calculations of thermodynamic properties of multicomponent liquid alloys. The phenomenological Associate Solution Model (ASM) is used to describe the thermodynamic mixing functions of glass-forming liquid alloys. The degree of chemical short-range ordering in liquid alloys is estimated in the framework of ASM as the total mole fraction of associates in the solution. Glass-forming composition regions are predicted using the empirical rule, according to which amorphization by quenching proceeds successfully for melts in which the total molar fraction of associates exceeds 0.3 at the glass transition temperature. The analysis of predicted composition regions of amorphization of the melts of the Cu–Co–Ni–Ti–Zr and Cu–Co–Ni–Ti–Hf systems allows us to specify the certain total concentration of metals, which are donors (Ti, Zr, Hf – IVB metals) and acceptors (Co, Ni, Cu – Late Transition Metals, LTM) of electrons in the melt. The composition of rapidly quenched metallic glasses of the Cu–Co–Ni–Ti–Zr and Cu–Co–Ni–Ti–Hf systems must be fulfilled the conditions ΣxLTM > 0.25 and ΣxIVB > 0.28.

Keywords
glass-forming melts of transition metals, thermodynamic properties of liquid alloys, associate solution model, composition regions of amorphization

Acknowledgments
This work was supported by the Ministry of Education and Science of Ukraine under the grant 0122U000970.

References
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