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Updated: Sep 29, 2025

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Study on isothermal crystallization kinetics of Zr55.7Cu22.4Ni7.2Al14.7 bulk amorphous alloy
Weijian Zhang1, Pingjun Tao2, Yugan Chen1
1School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, People's Republic of China.
Abstract:
Zr55.7Cu22.4Ni7.2Al14.7 alloy bars were prepared by copper mold suction casting, and the structure and thermodynamic properties of the prepared specimens were characterized by X-ray diffractometer and differential scanning calorimeter. Furthermore, isothermal crystallization mechanism and crystallization activation energy were investigated by Johnson-Mehl-Avrami model and Arrhenius equation. The results show that the structure of the specimen is amorphous. The glass transition temperature (Tg), onset crystallization temperature (Tx) and crystallization peak temperature (Tp) are 713 K, 779 K, and 781 K, respectively, and supercooled liquid region ([Formula: see text]) is 66 K. The crystallization incubation times are shortened and the crystallization transformation rates increase with temperature rising. As the crystallization volume fraction increases, the crystallization nucleation rate shows a trend of first increasing and subsequently decreasing, while the activation energy decreases monotonously, in the same time, the crystallization behavior transforms from interface-controlled to diffusion-controlled growth. The thermal stability of amorphous alloy is also discussed.
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