Abstrakt

Calculation of Activation Energy, Frequency Factor and Avrami Exponent of Amorphous Fe76Pr4B20 and Fe76Dy4B20 Alloys on the Basis of Crystallization Kinetics

Bhanu Prasad B and Rajya Lakshmi N

The activation energy of crystallization (Ea), Frequency factor(k0) and Avrami exponent (n) of amorphous Fe76Pr4B20 and Fe76Dy4B20 alloys have been calculated by three methods namely Kissinger, Augis- Bennet and Matusita-Sakka on the basis of crystallization kinetics using Differential Scanning Calorimetry (DSC). The average activation energy for primary crystallization of amorphous Fe76Pr4B20 and Fe76Dy4B20 alloys using the above three methods is determined as 389.67 kJouls/ mole and 578.59 kJouls/mole, respectively. The frequency factor of amorphous Fe76Pr4B20 and Fe76Dy4B20 alloys using Kissinger method is found to be 4.542 × 1019 (sec)-1 and 8.5 × 1031 (sec)-1, respectively. Similarly, the Avrami exponent of amorphous Fe76Pr4B20 and Fe76Dy4B20 alloys is found to be 1.67 and 0.831, respectively.