Abstract
The isochronal crystallization kinetics of Ti 40Zr 25Ni 8Cu 9Be 18 metallic glass has been studied by differential scanning calorimetry (DSC) at various heating rates. The changeable activation energies with crystalline fraction are determined by the Kissinger–Akahira–Sunose (KAS) method without assuming any kinetic model. Results obtained by directly fitting the experimental DSC data to the calculated DSC curves indicate that the crystallization process of Ti 40Zr 25Ni 8Cu 9Be 18 metallic glass cannot be satisfactorily described by the Johnson–Mehl–Avrami (JMA) model. Kinetic parameters of the both crystallization events are significantly influenced by the heating rate. Simulation results indicate that the Sestak–Berggren (SB) model is more suitable to describe the crystallization kinetics of this Ti-based metallic glass. Reasons of the deviations from the JMA model are also discussed.
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