Paper Titles
Preface
The Interaction of the Components of the Injected Two-Phase Flow with Hot Metal during Injection Desulphurization in the Ladle
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Thermodynamic Study and Predicted Amorphization Composition Range of the Co-Ni-Ti Liquid Alloys
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Features of the Formation of the Structure of Welded Joints of Structural Steels during Underwater Welding with Filler Wire 12X18N9T Using External Electromagnetic Influence
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Axial Fatigue of PBF-LB Ti6Al4V: Process and Surface Effects
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Sustainable Roller Burnishing: Effects on Surface Roughness and Power Consumption in Additively Manufactured AlSi10Mg Alloy
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Thermodynamic Study and Predicted Amorphization Composition Range of the Co-Ni-Ti Liquid Alloys

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Abstract:

Cobalt-based alloys with nickel and titanium represent a promising class of materials for the development of novel amorphous and high-temperature-resistant alloys. The targeted design of such materials requires detailed knowledge of the thermodynamic properties of liquid alloys. In this work, high-temperature calorimetry was employed to investigate the partial enthalpy of mixing of titanium in the Co–Ni–Ti liquid alloys along the cross-sections xCo/xNi = 3, xCo/xNi = 1/3, and xCo/xNi = 1 at 1873 K and in the concentration range xTi = 0–0.6. The partial mixing enthalpy of titanium exhibits negative values, indicating strong interatomic interactions among the components in the melt. The integral mixing enthalpy ΔmH over the entire compositional triangle was described using the Redlich–Kister–Muggianu formalism. The ΔmH function shows pronounced negative values, emphasizing the significant role of CoTi and NiTi binary interactions. The associate solution model (ASM) was applied to describe the temperature and composition dependence of the thermodynamic mixing functions in the liquid Co–Ni–Ti alloys. The integral enthalpy ΔmH, excess entropy ΔmSex, excess Gibbs energy ΔmGex, and Gibbs energy ΔmG of mixing were evaluated in the temperature range 800–1873 K. It was shown that these thermodynamic functions exhibit increasing negative deviations from ideality upon cooling of the melts. Within the ASM framework, the degree of chemical short-range order in the Co–Ni–Ti liquid alloys was assessed as the total mole fraction of associates Σxassoc in the solution. It was demonstrated that the Σxassoc is significant and increases with decreasing temperature. The amorphization composition range for the Co–Ni–Ti liquid alloys was predicted based on our previously proposed empirical criterion related with Σxassoc. The predicted range of xTi ≈ 0.2–0.8 is in satisfactory agreement with known compositions of amorphous alloys in the edged binary systems.

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Periodical:

Key Engineering Materials (Volume 1043)

Pages:

11-19

DOI:

https://doi.org/10.4028/p-Pt2psd

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Online since:

February 2026

Authors:

Mykhailo Turchanin, Pavlo Agraval*, Anna Vodopyanova, Vladyslav Korsun

Keywords:

Amorphization Composition Range, Associate Solution Model (ASM), Chemical Short-Range Order in Liquid Alloys, Co–Ni–Ti Liquid Alloys, Enthalpy of Mixing, High-Temperature Calorimetry, Thermodynamic Mixing Functions

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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