The evolution of the microstructure during the crystallization of amorphous Fe80B20 alloys has been investigated by small-angle neutron scattering (SANS) and transmission electron microscopy (TEM). Samples with an increasing degree of crystallization were obtained by performing different isothermal heat treatments on melt spun amorphous ribbons. The TEM measurements indicate that the crystallization occurs by nucleation and growth of Fe3B spherulites which include small finely divided alpha-Fe acicular crystallites. On the basis of the TEM results a model for the quantitative analysis of the SANS data has been formulated. The results show that, due to the high growth velocity of the nucleated particles, only their number increases with increasing annealing time, while their size and internal structure is not dependent on the degree of crystallization.
Microstructural characterization of Fe80B20 eutectic spherulites by small angle neutron scattering and transmission electron microscopy
RONCONI, Franco;
1996
Abstract
The evolution of the microstructure during the crystallization of amorphous Fe80B20 alloys has been investigated by small-angle neutron scattering (SANS) and transmission electron microscopy (TEM). Samples with an increasing degree of crystallization were obtained by performing different isothermal heat treatments on melt spun amorphous ribbons. The TEM measurements indicate that the crystallization occurs by nucleation and growth of Fe3B spherulites which include small finely divided alpha-Fe acicular crystallites. On the basis of the TEM results a model for the quantitative analysis of the SANS data has been formulated. The results show that, due to the high growth velocity of the nucleated particles, only their number increases with increasing annealing time, while their size and internal structure is not dependent on the degree of crystallization.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
