https://doi.org/10.1140/epjs/s11734-025-02071-3
Regular Article
Non-isothermal crystallization kinetics and thermal behavior of TbYScAlCo high-entropy bulk metallic glass
Vatolin Institute of Metallurgy, Ural Division of Russian Academy of Sciences, 620002, Yekaterinburg, Russia
Received:
17
June
2025
Accepted:
13
November
2025
Published online:
24
November
2025
The thermal behavior and non-isothermal crystallization of a new bulk amorphous equiatomic high-entropy (HE-BMG) TbYScAlCo alloy were investigated using differential scanning calorimetry (DSC). The DSC measurements revealed that the TbYScAlCo HE-BMG alloy exhibited a four-stage crystallization process. For the TbYScAlCo alloy, the apparent activation energy (average value Eα = 300 kJ/mol), pre-exponential factor (average value logA = 21.54), and glass-forming ability parameters (kinetic fragility index, characteristic temperatures) were determined. The dependence of the local activation energy on the conversion fraction (α) was analyzed using the Ozawa, Friedman, and Vyazovkin methods. The local activation energy E(α), derived from the isoconversional methods, indicates a non-linear Arrhenius behavior and a complex primary crystallization process. The validity of the Johnson–Mehl–Avrami (JMA) model and the mathematical description of the autocatalytic crystallization behavior using the Šesták–Berggren model were confirmed. The applicability of the proposed models to non-isothermal crystallization was verified using the master plot method, the Malek method, and multivariate non-linear regression analysis. In the case of the primary crystallization of the amorphous TbYScAlCo alloy under non-isothermal conditions, the nucleation kinetics are best described by the Šesták–Berggren autocatalytic model with the following expression for the reaction rate: dα/dt = 2.52 · 1022 exp(-301/RT) · α0.8(1 − α)1.2.
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Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
