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Small‐Angle X‐ray Scattering Study of Nanocrystalline and Amorphous States of the Fe 73.5 CuNb 3 Si 13.5 B 9 Alloy
Author(s) -
Dos Santos D. R.,
Torriani I. L.,
Ramos A. Y.,
Knobel M.
Publication year - 1997
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889897001891
Subject(s) - nanocrystalline material , materials science , amorphous solid , crystallite , crystallization , scattering , amorphous metal , annealing (glass) , melt spinning , crystallography , analytical chemistry (journal) , quenching (fluorescence) , diffraction , metallurgy , optics , thermodynamics , chemistry , nanotechnology , physics , chromatography , fluorescence , composite material , fiber
The structural evolution of the nanocrystalline material obtained from the amorphous compound Fe 73.5 CuNb 3 Si 13.5 B 9 was investigated by small‐angle X‐ray scattering. Four sets of amorphous metallic ribbons were produced by melt spinning using different quenching rates. Samples of each set were annealed above the crystallization temperature; X‐ray diffraction analysis showed the formation of an ordered Fe–Si solid solution with average grain sizes ranging from 9 to 11 nm. Small‐angle scattering curves of the samples in the initial amorphous states revealed different intensities for different quenching rates, caused by the presence of heterogeneities with dimensions larger than those of the crystallites formed after thermal treatment. In addition, scattering measurements carried out in situ during isothermal annealing showed an intensity evolution as a function of time, attributed to electron‐density contrast variation caused by the atomic diffusion process that occurs during crystallization.