Differential scanning calorimeter (DSC), X-ray diffractometer (XRD) and transmition electron microscopy (TEM) were used to study the crystallization kinetics of partially amorphous Fe 3 3 Zr 6 7 alloys. Results show that the grain growth dominated the crystallization process. Although an inhomogeneous distribution of quenched-in nuclei exists in the samples, which is contrary to the basic assumptions of the classical Avrami analysis, the obtained Avrami exponents are still in agreement with the Johnson-Mehl-Avrami (JMA) analysis.