The evolution of the microstructure of the crystalline phases formed at the various stages of the Fe80B20 amorphous alloy crystallization process has been investigated by small angle neutron scattering and transmission electron microscopy. Transmission electron microscopy measurements indicate that the crystallization of Fe80B20 amorphous ribbons occurs by nucleation and growth of Fe3B spherulites which include small finely divided alpha-Fe acicular crystallites. It is shown that the small angle neutron scattering signal is due to the contrast between alpha-Fe particles and the Fe3B matrix in which they are embedded and can be interpreted in terms of two families of roughly cylindrical homogeneous particles with different characteristic dimensions. These families can be associated to individual alpha-Fe dendritic structure and to the clusters formed by associations of such dendrites.
Morphological Characterization of alpha-Fe Nanostructures in Eutectic Spherulites
RONCONI, Franco;
1995
Abstract
The evolution of the microstructure of the crystalline phases formed at the various stages of the Fe80B20 amorphous alloy crystallization process has been investigated by small angle neutron scattering and transmission electron microscopy. Transmission electron microscopy measurements indicate that the crystallization of Fe80B20 amorphous ribbons occurs by nucleation and growth of Fe3B spherulites which include small finely divided alpha-Fe acicular crystallites. It is shown that the small angle neutron scattering signal is due to the contrast between alpha-Fe particles and the Fe3B matrix in which they are embedded and can be interpreted in terms of two families of roughly cylindrical homogeneous particles with different characteristic dimensions. These families can be associated to individual alpha-Fe dendritic structure and to the clusters formed by associations of such dendrites.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
