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Characterization of Crystallization in Amorphous 2605 SC Alloy

Research Area: Nanofabrication Year: 1984
Type of Publication: Article
Authors: O. T. Inal; Axel Scherer; E. G. Reineke; M. J. Borden
Journal: Thin Solid Films Volume: 1999
Number: 4 Pages: 395-412
Month: September
The annealing characteristics, the crystallization sequence of precipitating phases and their geometry have been studied for the amorphous alloy 2605 SC through X-ray and reflection electron diffraction, scanning electron microscopy and field ion microscopy. The as-received samples were found to contain small domains of crystalline Fe3Si, Fe23(B, C)6 and an oxide of iron (maghemite, Fe3O4) on the ribbon surfaces. Samples annealed at 673 K for 10, 50, 100 and 1000 min reveal that there is a sequential difference in the crystallization of the ribbon surfaces and the bulk, the latter exhibiting the nucleation of α-Fe first. Moreover, in situ (in an electron microscope) continuous annealing of the samples indicates that, although formation of ferrite crystals occurs in the bulk, the initial crystallizing phase on the surfaces is the f.c.c. Fe23(B, C)6. Heat treatment at temperatures above 773 K, however, is seen to produce similar phase consistency, and thus diffraction patterns, from both regions. These structures primarily are seen to be composed of a dendritic α-Fe and the Fe23(B, C)6 phases along with the as yet non-crystallized amorphous domains. The equilibrium Fe2B phase is not observed at the annealing temperatures (above 923 K) used.
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