Effect of Dy on the microstructural and magnetic properties of an Nd-Fe-B strip-cast alloy

Tae Hoon Kim; Seong Rae Lee; Dong Hwan Kim; Tae Suk Jang

doi:10.1007/s12540-011-0422-7

Effect of Dy on the microstructural and magnetic properties of an Nd-Fe-B strip-cast alloy

Tae Hoon Kim, Seong Rae Lee, Dong Hwan Kim, Tae Suk Jang

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

8 Citations (Scopus)

Abstract

This paper examines the effect of Dy on the microstructural and magnetic properties of an (Nd_32.57-x,Dy_x)Fe_bal.B _0.97 (wt%; x=4.89, 6.51, 8.14, 9.77) strip-cast alloy. The average interlamellar spacing is reduced, and the grain uniformity and (00l) grain alignment in the direction perpendicular to the plane of the strip-cast alloy are enhanced as the Dy content is increased. Furthermore, the formation of α-Fe is increasingly suppressed as the Dy content is increased. These microstructural changes can be explained by an increase in the effective cooling rate of the melted alloy, which is caused by an increase in the solidus temperature of the (Nd,Dy)₂Fe₁₄B phase resulting from the substitution of Dy with Nd. The appearance of DyNdO₃ precipitates in the grain boundaries also contributes to the grain refinement. Therefore, the improvement in the magnetic properties afforded by the addition of Dy depends on the large anisotropy field of Dy₂Fe₁₄B; it also depends on the grain refinement and alignment caused by the increased effective cooling rate and by the DyNdO₃ precipitates that form along the Nd-rich grain boundaries.

Original language	English
Pages (from-to)	329-334
Number of pages	6
Journal	Metals and Materials International
Volume	17
Issue number	2
DOIs	https://doi.org/10.1007/s12540-011-0422-7
Publication status	Published - 2011 Apr

Bibliographical note

Funding Information:
This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Commerce, Industry and Energy, Republic of Korea and a Korea University Grant.

Keywords

Casting
Ferromagnetic materials
Intermetallics
Magnetic properties
Nd-Fe-B strip-cast alloy

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

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10.1007/s12540-011-0422-7

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title = "Effect of Dy on the microstructural and magnetic properties of an Nd-Fe-B strip-cast alloy",

abstract = "This paper examines the effect of Dy on the microstructural and magnetic properties of an (Nd32.57-x,Dyx)Febal.B 0.97 (wt%; x=4.89, 6.51, 8.14, 9.77) strip-cast alloy. The average interlamellar spacing is reduced, and the grain uniformity and (00l) grain alignment in the direction perpendicular to the plane of the strip-cast alloy are enhanced as the Dy content is increased. Furthermore, the formation of α-Fe is increasingly suppressed as the Dy content is increased. These microstructural changes can be explained by an increase in the effective cooling rate of the melted alloy, which is caused by an increase in the solidus temperature of the (Nd,Dy)2Fe14B phase resulting from the substitution of Dy with Nd. The appearance of DyNdO3 precipitates in the grain boundaries also contributes to the grain refinement. Therefore, the improvement in the magnetic properties afforded by the addition of Dy depends on the large anisotropy field of Dy2Fe14B; it also depends on the grain refinement and alignment caused by the increased effective cooling rate and by the DyNdO3 precipitates that form along the Nd-rich grain boundaries.",

keywords = "Casting, Ferromagnetic materials, Intermetallics, Magnetic properties, Nd-Fe-B strip-cast alloy",

author = "Kim, {Tae Hoon} and Lee, {Seong Rae} and Kim, {Dong Hwan} and Jang, {Tae Suk}",

note = "Funding Information: This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Commerce, Industry and Energy, Republic of Korea and a Korea University Grant.",

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doi = "10.1007/s12540-011-0422-7",

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journal = "Metals and Materials International",

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AU - Kim, Tae Hoon

AU - Lee, Seong Rae

AU - Kim, Dong Hwan

AU - Jang, Tae Suk

N1 - Funding Information: This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Commerce, Industry and Energy, Republic of Korea and a Korea University Grant.

PY - 2011/4

Y1 - 2011/4

N2 - This paper examines the effect of Dy on the microstructural and magnetic properties of an (Nd32.57-x,Dyx)Febal.B 0.97 (wt%; x=4.89, 6.51, 8.14, 9.77) strip-cast alloy. The average interlamellar spacing is reduced, and the grain uniformity and (00l) grain alignment in the direction perpendicular to the plane of the strip-cast alloy are enhanced as the Dy content is increased. Furthermore, the formation of α-Fe is increasingly suppressed as the Dy content is increased. These microstructural changes can be explained by an increase in the effective cooling rate of the melted alloy, which is caused by an increase in the solidus temperature of the (Nd,Dy)2Fe14B phase resulting from the substitution of Dy with Nd. The appearance of DyNdO3 precipitates in the grain boundaries also contributes to the grain refinement. Therefore, the improvement in the magnetic properties afforded by the addition of Dy depends on the large anisotropy field of Dy2Fe14B; it also depends on the grain refinement and alignment caused by the increased effective cooling rate and by the DyNdO3 precipitates that form along the Nd-rich grain boundaries.

AB - This paper examines the effect of Dy on the microstructural and magnetic properties of an (Nd32.57-x,Dyx)Febal.B 0.97 (wt%; x=4.89, 6.51, 8.14, 9.77) strip-cast alloy. The average interlamellar spacing is reduced, and the grain uniformity and (00l) grain alignment in the direction perpendicular to the plane of the strip-cast alloy are enhanced as the Dy content is increased. Furthermore, the formation of α-Fe is increasingly suppressed as the Dy content is increased. These microstructural changes can be explained by an increase in the effective cooling rate of the melted alloy, which is caused by an increase in the solidus temperature of the (Nd,Dy)2Fe14B phase resulting from the substitution of Dy with Nd. The appearance of DyNdO3 precipitates in the grain boundaries also contributes to the grain refinement. Therefore, the improvement in the magnetic properties afforded by the addition of Dy depends on the large anisotropy field of Dy2Fe14B; it also depends on the grain refinement and alignment caused by the increased effective cooling rate and by the DyNdO3 precipitates that form along the Nd-rich grain boundaries.

KW - Casting

KW - Ferromagnetic materials

KW - Intermetallics

KW - Magnetic properties

KW - Nd-Fe-B strip-cast alloy

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Effect of Dy on the microstructural and magnetic properties of an Nd-Fe-B strip-cast alloy

Abstract

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