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

Casey Smith; Shravana Katakam; Soumya Nag; Y. R. Zhang; J. Y. Law; Raju V. Ramanujan; Narendra B. Dahotre; Rajarshi Banerjee

doi:10.1007/s11661-014-2239-8

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

Casey Smith, Shravana Katakam, Soumya Nag, Y. R. Zhang, J. Y. Law, Raju V. Ramanujan, Narendra B. Dahotre, Rajarshi Banerjee

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

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, Fe_73.5Si_13.5B₉Nb₃Cu ₁, also referred to as FINEMET, and a Fe_76.5Si _13.5B₉Cu₁ 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 Fe_76.5Si_13.5B₉Cu₁ 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 Fe_76.5Si_13.5B ₉Cu₁ alloy.

Original language	English
Pages (from-to)	2998-3009
Number of pages	12
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	45
Issue number	7
DOIs	https://doi.org/10.1007/s11661-014-2239-8
State	Published - Jun 2014
Externally published	Yes

Funding

The research of RVR is conducted by NTU-HUJ-BGU Nanomaterials for Energy and Water Management Programme under the Campus for Research Excellence and Technological Enterprise (CREATE) that is supported by the National Research Foundation, Prime Minister’s Office, Singapore.

Funders	Funder number
National Research Foundation

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10.1007/s11661-014-2239-8

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Smith, C., Katakam, S., Nag, S., Zhang, Y. R., Law, J. Y., Ramanujan, R. V., Dahotre, N. B., & Banerjee, R. (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: Physical Metallurgy and Materials Science, 45(7), 2998-3009. https://doi.org/10.1007/s11661-014-2239-8

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

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, Fe73.5Si13.5B9Nb3Cu 1, also referred to as FINEMET, and a Fe76.5Si 13.5B9Cu1 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 Fe76.5Si13.5B 9Cu1 alloy.",

author = "Casey Smith and Shravana Katakam and Soumya Nag and Zhang, {Y. R.} and Law, {J. Y.} and Ramanujan, {Raju V.} and Dahotre, {Narendra B.} and Rajarshi Banerjee",

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doi = "10.1007/s11661-014-2239-8",

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Smith, C, Katakam, S, Nag, S, Zhang, YR, Law, JY, Ramanujan, RV, Dahotre, NB & Banerjee, R 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: Physical Metallurgy and Materials Science, vol. 45, no. 7, pp. 2998-3009. https://doi.org/10.1007/s11661-014-2239-8

TY - JOUR

T1 - Comparison of the crystallization behavior of Fe-Si-B-Cu and Fe-Si-B-Cu-Nb-based amorphous soft magnetic alloys

AU - Smith, Casey

AU - Katakam, Shravana

AU - Nag, Soumya

AU - Zhang, Y. R.

AU - Law, J. Y.

AU - Ramanujan, Raju V.

AU - Dahotre, Narendra B.

AU - Banerjee, Rajarshi

PY - 2014/6

Y1 - 2014/6

N2 - The role of the solute elements, copper, and niobium, on the different stages of de-vitrification or crystallization of two amorphous soft magnetic alloys, Fe73.5Si13.5B9Nb3Cu 1, also referred to as FINEMET, and a Fe76.5Si 13.5B9Cu1 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 Fe76.5Si13.5B 9Cu1 alloy.

AB - The role of the solute elements, copper, and niobium, on the different stages of de-vitrification or crystallization of two amorphous soft magnetic alloys, Fe73.5Si13.5B9Nb3Cu 1, also referred to as FINEMET, and a Fe76.5Si 13.5B9Cu1 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 Fe76.5Si13.5B 9Cu1 alloy.

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JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

IS - 7

ER -

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

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