ON THE RELATION BETWEEN NONISOTHERMAL AND ISOTHERMAL KOLMOGOROV-JOHNSON-MEHL-AVRAMI CRYSTALLIZATION KINETICS

Solid state transformations are often described in terms of the Kolmogorov-Johnson-Mehl-Avrami (KJMA) kinetics. In contrast to isothermal processes the correct description of the non-isothermal crystallization is controversially discussed in the literature. Therefore a method for the derivation of the non-isothermal kinetics will be proposed which, unlike in the literature, uses an infinitesimal discretization of the continuous temperature-time dependence and the KJMA crystallization behaviour on each subsequent isothermal step, and which avoids the assumption of any rate equation. The method will be applied to recrystallization DSC measurements on deformed coppeT.