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In‐situ small‐angle scattering study on the formation of a nanocrystalline soft‐magnetic alloy
Author(s) -
Dos Santos D. R.,
Torriani I. L.,
Silva F. C. S.,
Knobel M.
Publication year - 2000
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/s0021889899015599
Subject(s) - materials science , nanocrystalline material , nucleation , crystallization , small angle x ray scattering , alloy , annealing (glass) , scattering , amorphous solid , diffraction , volume fraction , grain size , nanocrystal , analytical chemistry (journal) , crystallography , chemical physics , thermodynamics , metallurgy , composite material , nanotechnology , chemistry , optics , physics , chromatography
A detailed study is presented on the nanocrystallization of the amorphous alloy Fe 86 Zr 7 Cu 1 B 6 (indices indicate at. %). Melt‐spun ribbons were rapidly annealed by Joule heating, and the electrical resistance showed strong variations during thermal treatment. X‐ray diffraction patterns indicate that these variations are related to the nucleation and growth of α‐Fe nanocrystals, and from peak profile analysis we obtained the average grain size and crystalline volume fraction for different annealing currents. The disorder‐order transition was studied by in‐situ small‐angle X‐ray scattering during conventional furnace treatments. SAXS intensity evolution for different temperatures, both below and above the crystallization temperature of the alloy, showed that a fast atomic rearrangement leads to the formation of atomic clusters before crystallization. The evolution of the size distribution function of these clusters as a function of time and temperature was obtained assuming a polydisperse system of spherical particles.