Comparison of the crystallization behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-based amorphous soft magnetic alloys

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 detai...

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Main Authors: Smith, Casey, Katakam, Shravana, Nag, Soumya, Zhang, Y. R., Law, J. Y., Ramanujan, Raju V., Dahotre, Narendra B., Banerjee, Rajarshi
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2014
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Online Access:https://hdl.handle.net/10356/102934
http://hdl.handle.net/10220/24411
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spelling sg-ntu-dr.10356-1029342020-06-01T10:01:42Z Comparison of the crystallization behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-based amorphous soft magnetic alloys Smith, Casey Katakam, Shravana Nag, Soumya Zhang, Y. R. Law, J. Y. Ramanujan, Raju V. Dahotre, Narendra B. Banerjee, Rajarshi School of Materials Science & Engineering DRNTU::Engineering::Materials 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. 2014-12-09T09:26:10Z 2019-12-06T21:02:27Z 2014-12-09T09:26:10Z 2019-12-06T21:02:27Z 2014 2014 Journal Article 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. 1073-5623 https://hdl.handle.net/10356/102934 http://hdl.handle.net/10220/24411 10.1007/s11661-014-2239-8 en Metallurgical and materials transactions a © 2014 The Minerals, Metals & Materials Society and ASM International.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Materials
spellingShingle DRNTU::Engineering::Materials
Smith, Casey
Katakam, Shravana
Nag, Soumya
Zhang, Y. R.
Law, J. Y.
Ramanujan, Raju V.
Dahotre, Narendra B.
Banerjee, Rajarshi
Comparison of the crystallization behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-based amorphous soft magnetic alloys
description 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.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Smith, Casey
Katakam, Shravana
Nag, Soumya
Zhang, Y. R.
Law, J. Y.
Ramanujan, Raju V.
Dahotre, Narendra B.
Banerjee, Rajarshi
format Article
author Smith, Casey
Katakam, Shravana
Nag, Soumya
Zhang, Y. R.
Law, J. Y.
Ramanujan, Raju V.
Dahotre, Narendra B.
Banerjee, Rajarshi
author_sort Smith, Casey
title Comparison of the crystallization behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-based amorphous soft magnetic alloys
title_short Comparison of the crystallization behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-based amorphous soft magnetic alloys
title_full Comparison of the crystallization behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-based amorphous soft magnetic alloys
title_fullStr Comparison of the crystallization behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-based amorphous soft magnetic alloys
title_full_unstemmed Comparison of the crystallization behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-based amorphous soft magnetic alloys
title_sort comparison of the crystallization behavior of fe-si-b-cu and fe-si-b-cu-nb-based amorphous soft magnetic alloys
publishDate 2014
url https://hdl.handle.net/10356/102934
http://hdl.handle.net/10220/24411
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