THE COMPLEX DSC ANALYSIS OF THE FIRST CRYSTALLIZATION PEAK OF FE80SI10B10 METALLIC-GLASS

The crystallization of Fe-80 Si-10 B-10 glass was studied both by line ar heating and isothermal differential scanning calorimetry (DSC). Two well separated crystallization peaks were always observed. On the bas is of the classical isothermal Johnson-Mehl-Avrami (JMA) procedure bot h transient nucleation and transient growth kinetics with the complex exponent n similar to 2.8 and mean activation energy E(JMA) = 323 kJ mol(-1) were determined for the first crystallization peak. Because fo r the degree of conversion alpha > 0.55 E (alpha) dependence was obse rved, the deconvolution of the isothermal peak into the subsequent JMA nucleation-and-growth and grain-growth effects was used to fit the me asured data. Simple JMA kinetics could not be determined for the linea r heating first crystallization peak. All these results correlate with structural analysis studies.