Abstract
The crystallization kinetics of the amorphous metallic alloy Fe 81B 13.5Si 3.5C 2 (Metglas 2605SC) was studied using ferromagnetic resonance (FMR) measurements on samples annealed at 693 K for different times, and differential scanning calorimetry (DSC) with several heating rates between 2 and 30 K s −1. The increase of the FMR linewidth with annealing time is attributed to crystallization. Assuming a linear relation between the linewidth increase and the transformed fraction, a value of 1.20±0.10 was obtained for the Avrami exponent, n. The DSC measurements showed three exothermal peaks, suggesting a crystallization process involving more than one phase. The lower temperature peak, which appears at about 750 K for a heating rate of 2 K min −1, increases with heating rate and becomes dominant for heating rates greater than about 10 K min −1. The Avrami exponent calculated from the DSC results for this peak, n=1.24±0.10, agrees with FMR results within experimental error and is consistent with a diffusion-controlled process with a nucleation rate close to zero.
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