Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/102934
Title: Comparison of the crystallization behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-based amorphous soft magnetic alloys
Authors: Smith, Casey
Katakam, Shravana
Nag, Soumya
Zhang, Y. R.
Law, J. Y.
Ramanujan, Raju V.
Dahotre, Narendra B.
Banerjee, Rajarshi
Keywords: DRNTU::Engineering::Materials
Issue Date: 2014
Source: Smith, C., Katakam, S., Nag, S., Zhang, Y. R., Law, J. Y., Ramanujan, R. V., et al. (2014). Comparison of the crystallization behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-based amorphous soft magnetic alloys Metallurgical and materials transactions a, 45(7), 2998-3009.
Series/Report no.: Metallurgical and materials transactions a
Abstract: The role of the solute elements, copper, and niobium, on the different stages of de-vitrification or crystallization of two amorphous soft magnetic alloys, Fe73.5Si13.5B9Nb3Cu1, also referred to as FINEMET, and a Fe76.5Si13.5B9Cu1 alloy, a model composition without Nb, has been investigated in detail by coupling atom probe tomography and transmission electron microscopy. The effects of copper clustering and niobium pile-up at the propagating interface between the α-Fe3Si nanocrystals and the amorphous matrix, on the nucleation and growth kinetics have been addressed. The results demonstrate that while Cu clustering takes place in both alloys in the early stages, the added presence of Nb in FINEMET severely restricts the diffusivity of solute elements such as Cu, Si, and B. Therefore, the kinetics of solute partitioning and mobility of the nanocrystal/amorphous matrix interface is substantially slower in FINEMET as compared to the Fe76.5Si13.5B9Cu1 alloy. Consequently, the presence of Nb limits the growth rate of the α-Fe3Si nanocrystals in FINEMET and results in the activation of a larger no. of nucleation sites, leading to a substantially more refined microstructure as compared to the Fe76.5Si13.5B9Cu1 alloy.
URI: https://hdl.handle.net/10356/102934
http://hdl.handle.net/10220/24411
ISSN: 1073-5623
DOI: 10.1007/s11661-014-2239-8
Schools: School of Materials Science & Engineering 
Rights: © 2014 The Minerals, Metals & Materials Society and ASM International.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

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