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The Composition Effect on the Nanocrystallization of Finemet Amorphous Alloys

Published online by Cambridge University Press:  10 February 2011

J. Zhu ,
T. Pradell ,
N. Clavaguera  and
M. T. Clavaguera-Mora
J. Zhu
Affiliation:
Grup de Física de Materials I, Dept. de Física, Universität Autònoma de Barcelona 08193, Bellaterra, Spain
T. Pradell
Affiliation:
ESAB, Universität Politecnica de Catalunya, Urgell 187, 08036-Barcelona, Spain
N. Clavaguera
Affiliation:
Física de I'Estat Solid, Dept. ECM. Facultat de Física, Universität de Barcelona, Diagonal 647, 08028 Barcelona, Spain
M. T. Clavaguera-Mora
Affiliation:
Grup de Física de Materials I, Dept. de Física, Universität Autònoma de Barcelona 08193, Bellaterra, Spain
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Abstract

Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), Neutron Diffraction (ND) and Mössbauer Spectroscopy (MS) were used to study the nanocrystallization process of Fe73.5Cu1Nb3Si22.5–xBx (x=5, 7, 8, 9 and 12) amorphous alloys. Both the temperature range and the activation energy of Fe(Si) phase precipitation from the amorphous martrix increase with the initial B composition. The initial Si composition influences the mechanism of the nanocrystallization: for the Si rich samples, the beginning of nucleation and growth processes is interface controlled, for the B rich samples it is diffusion controlled. Secondary crystallization from the remaining amorphous is mainly Fe3B and Fe2B, the ratio of Fe3B/Fe2B being dependent on the initial composition too.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 457: Symposium V – Nanophase and Nanocomposite Materials II , 1996 , 285
Copyright
Copyright © Materials Research Society 1997

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References

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