Behavior of Nb atoms in Nb substituted Nd2Fe14B nanocrystalline alloys investigated by atom probe tomography

Y. Q. Wu; M. J. Kramer; Z. Chen; B. M. Ma; M. K. Miller

doi:10.1109/TMAG.2004.829018

Behavior of Nb atoms in Nb substituted Nd₂Fe₁₄B nanocrystalline alloys investigated by atom probe tomography

Y. Q. Wu, M. J. Kramer, Z. Chen, B. M. Ma, M. K. Miller

Research and Economic Development

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Abstract

The behavior of Nb atoms in Nd₁₂Fe_82-xB ₆Nb_x (x = 0 to 3) nanocrystalline alloys has been investigated by using atom probe tomography (APT) technique on near-atomic scale in the present paper. Three-dimensional atom probe (3DAP) analyses on the Nb substituted alloys clearly reveal that Nb atoms are enriched at grain boundaries with a peak concentration about 4 times higher than the average for Nd ₂Fe₁₄B grains. A grain boundary region with a chemical composition near the Nb: Fe: B stoichiometry of 3:3:5 is also measured for the x = 3 alloy. The results provide direct evidence of microstructural refinement due to solute drag of Nb atoms during solidification, resulting in Nb enrichment at grain boundaries and possibly the formation of a Nb-rich interfacial phase which give rise to enhanced magnetic properties.

Original language	English
Pages (from-to)	2886-2888
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	40
Issue number	4 II
DOIs	https://doi.org/10.1109/TMAG.2004.829018
State	Published - Jul 2004

Keywords

Atom probe tomography
Nanocrystalline
Niobium
Permanent magnets

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10.1109/TMAG.2004.829018

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title = "Behavior of Nb atoms in Nb substituted Nd2Fe14B nanocrystalline alloys investigated by atom probe tomography",

abstract = "The behavior of Nb atoms in Nd12Fe82-xB 6Nbx (x = 0 to 3) nanocrystalline alloys has been investigated by using atom probe tomography (APT) technique on near-atomic scale in the present paper. Three-dimensional atom probe (3DAP) analyses on the Nb substituted alloys clearly reveal that Nb atoms are enriched at grain boundaries with a peak concentration about 4 times higher than the average for Nd 2Fe14B grains. A grain boundary region with a chemical composition near the Nb: Fe: B stoichiometry of 3:3:5 is also measured for the x = 3 alloy. The results provide direct evidence of microstructural refinement due to solute drag of Nb atoms during solidification, resulting in Nb enrichment at grain boundaries and possibly the formation of a Nb-rich interfacial phase which give rise to enhanced magnetic properties.",

keywords = "Atom probe tomography, Nanocrystalline, Niobium, Permanent magnets",

author = "Wu, {Y. Q.} and Kramer, {M. J.} and Z. Chen and Ma, {B. M.} and Miller, {M. K.}",

year = "2004",

month = jul,

doi = "10.1109/TMAG.2004.829018",

language = "English",

volume = "40",

pages = "2886--2888",

number = "4 II",

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TY - JOUR

T1 - Behavior of Nb atoms in Nb substituted Nd2Fe14B nanocrystalline alloys investigated by atom probe tomography

AU - Wu, Y. Q.

AU - Kramer, M. J.

AU - Chen, Z.

AU - Ma, B. M.

AU - Miller, M. K.

PY - 2004/7

Y1 - 2004/7

N2 - The behavior of Nb atoms in Nd12Fe82-xB 6Nbx (x = 0 to 3) nanocrystalline alloys has been investigated by using atom probe tomography (APT) technique on near-atomic scale in the present paper. Three-dimensional atom probe (3DAP) analyses on the Nb substituted alloys clearly reveal that Nb atoms are enriched at grain boundaries with a peak concentration about 4 times higher than the average for Nd 2Fe14B grains. A grain boundary region with a chemical composition near the Nb: Fe: B stoichiometry of 3:3:5 is also measured for the x = 3 alloy. The results provide direct evidence of microstructural refinement due to solute drag of Nb atoms during solidification, resulting in Nb enrichment at grain boundaries and possibly the formation of a Nb-rich interfacial phase which give rise to enhanced magnetic properties.

AB - The behavior of Nb atoms in Nd12Fe82-xB 6Nbx (x = 0 to 3) nanocrystalline alloys has been investigated by using atom probe tomography (APT) technique on near-atomic scale in the present paper. Three-dimensional atom probe (3DAP) analyses on the Nb substituted alloys clearly reveal that Nb atoms are enriched at grain boundaries with a peak concentration about 4 times higher than the average for Nd 2Fe14B grains. A grain boundary region with a chemical composition near the Nb: Fe: B stoichiometry of 3:3:5 is also measured for the x = 3 alloy. The results provide direct evidence of microstructural refinement due to solute drag of Nb atoms during solidification, resulting in Nb enrichment at grain boundaries and possibly the formation of a Nb-rich interfacial phase which give rise to enhanced magnetic properties.

KW - Atom probe tomography

KW - Nanocrystalline

KW - Niobium

KW - Permanent magnets

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DO - 10.1109/TMAG.2004.829018

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VL - 40

SP - 2886

EP - 2888

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 4 II

ER -

Behavior of Nb atoms in Nb substituted Nd₂Fe₁₄B nanocrystalline alloys investigated by atom probe tomography

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