CALORIMETRIC AND RESISTOMETRIC STUDY ON CRYSTALLIZATION OF AMORPHOUS FE-B-SI ALLOYS

We have studied the crystallization behavior of amorphous Fe-B-Si allo ys through the differential scanning calorimetry, electrical resistivi ty measurement, X-ray diffraction and transmission electron microscopy , putting major emphasis on the appearance of the Fe-Si phase. The res ults were discussed in the light of Dubois and Le Caer's structural mo del. The amorphous alloys used in this study crystallized in two steps . The first step was the crystallization of the solid solution alpha-F e(Si). The appearance of alpha-Fe(Si) decreased the resistivity and in creased its temperature coefficient. We estimated the volume fraction of alpha-Fe(Si) from changes in the temperature coefficient. The cryst allization enthalpy and the volume fraction of alpha-Fe(Si) decreased with increasing B concentration. We can well explain this result by th eir model.