The Fe 8 3 B 1 7 metallic glass ribbons were prepared by a single roller melt-spinning technique in an atmosphere of helium. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Differential scanning calorimetry (DSC), were used to investigate the structural and thermal transformations of the Fe 8 3 B 1 7 metallic glass. The activation energy of crystallization E c was evaluated using different theoretical models. Applying the modified Johnson-Mehl-Avrami (JMA) equation reasonably suggests that the Fe 8 3 B 1 7 crystallization process is carried out by a bulk growth in two dimensions.