Nanocrystallization Process in FeCuNbSiB Based Alloys

摘要

The influence of different heat treatments on the nanocrystallization behavior of Fe_77.5Cu_1Nb_3Si_3Si_9.5B_9 amorphous alloys was investigated usign differnet techniques. The microstructural studies have been correlated with the results obtained by means of X-ray diffraction (XRD), differential scanning calorimetry (DSC) and thermogravimetry analysis under magnetic field measurements (TGM). From XRD, the mean crystallite size when annealing at different temperatures for different itmes, was evalauted and the values are in agreement with those obtained from the TEM. The progress of primary crystallization followed by isothermal DSC indicates that the tansformation to the nanophase microstructure involves nucleation and growth, in agreement with the overall grain size distribution obtaiend from TEM examination. The enahcement found in the Curie temperature of hte amorphous matrix should be ue to the interaction with the ferromagnetic particles with higher Curie temperature.