NONISOTHERMAL CRYSTALLIZATION KINETICS - COMPARISON BETWEEN CLASSICALAND ISOCONVERSIONAL KINETIC-PARAMETERS COMPUTING METHODS APPLIED TO NI92-CENTER-DOT-3SI4-CENTER-DOT-5B3-CENTER-DOT-2 METALLIC-GLASS

Differential scanning calorimetry (DSC) is one of the most used indire ct techniques in the study of thermal properties of solids. It is wide ly applied for computing the kinetic parameters describing the crystal lisation processes in amorphous materials. There are plenty of methods developed for calculating such parameters, most of them called classi cal ones, and these are developed in the JMA theoretical frame. A theo retical review on their basis and assumptions is made in order to impr ove the methods and the reliability of the kinetic information. Crysta llisation kinetic parameters computed by methods based on the isoconve rsion theory are developed this way in an attempt to solve the problem s present in the application of classical methods and improve the glob al description of the crystallisation processes. A model is applied to the crystallisation of Ni92.3Si4.5B3.2 metallic glass. It is shown th at the isoconversion method gives the best global description together with complementary and valuable process information.