Study of crystallization in the Fe86Cu1Zr7B6 amorphous alloy using FMR and DSC

The crystallization kinetics of the amorphous metallic allot Fe86Cu1Zr7B6 studied using ferromagnetic resonance (FMR) measurements on samples annealed at 673. 683 and 693 K for several periods of time and differential scanning calorimetry (DSC) using several heating rates between 2 and 30 K/s. 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 1.00+/-0.05 was obtained for the Avrami exponent. n. The DSC measurements showed two exothermal peaks, suggesting a crystallization process involving more than one phase. The Avrami exponent calculated from the DSC results for the first peak. n = 1.0+/-0.1, agrees with FMR results within experimental error and is consistent with a diffusion-controlled process with a nucleation rate close to zero. (C) 2002 Published by Elsevier Science B.V.