Abstract
The kinetics of nanocrystallization of Finemet alloy has been investigated by differential scanning calorimetry (DSC) using various heating rates and transmission electron microscope (TEM). The changeable activation energy E a with crystalline fraction α was given by an isoconversional method without assuming the kinetic model function, and the average value of E a was 386 ± 30 kJ/mol. What is more important, it is shown that this process cannot be described by the JMA model and that the two-parameter empirical Sestak–Berggren equation gives a more quantitative description. The calculated value of kinetic parameters m and n in SB equation is 0.36 ± 0.04 and 1.52 ± 0.05, respectively, which means an important role of the crystallized phase on the overall kinetics and a complex kinetic process involving both nucleation and growth. And the reliability of kinetic parameters m and n is tested by comparing calculated and experimental DSC data. In addition, a detailed explanation of the nanocrystallization mechanism of Finemet alloy was given by taking account of the microstructural changes during nanocrystallization.
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