Abstract
Non-isothermal differential scanning calorimetry is frequently employed to study the kinetics of transformation reactions and, in particular, the crystallization of glassy alloys. Such data are analyzed by the Kissinger method, which was originally derived for the study of homogeneous reactions. The consensus in the literature, over several decades, was that such applications (i.e. to heterogeneous solid state transformations) of the Kissinger method are not valid. In the present work the principal objections to these applications are addressed and alternative derivations of theoretical results are provided. These results demonstrate that the Kissinger method is valid for heterogeneous reactions of the type described by the Johnson–Mehl–Avrami equation in the isothermal case. Isothermal and non-isothermal data on the crystallization of Sb 0.20As 0.32Se 0.48 glassy alloy are presented. These experimental results and the discussion presented here help to clarify the effects of incubation time on the non-isothermal transformation kinetics and provide a further demonstration of the validity of the generalized Johnson–Mehl–Avrami theory for the description of heterogeneous solid state transformations.
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