Soft magnetic properties of bulk nanocrystalline Fe-(Zr,Hf)-B alloys produced by extruding amorphous powders

Akinori Kojima; Hidehiko Horikiri; Yoshihito Kawamura; Akihiro Makino; Akihisa Inoue; Tsuyoshi Masumoto

Soft magnetic properties of bulk nanocrystalline Fe-(Zr,Hf)-B alloys produced by extruding amorphous powders

Akinori Kojima, Hidehiko Horikiri, Yoshihito Kawamura, Akihiro Makino, Akihisa Inoue, Tsuyoshi Masumoto

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

Abstract

The Bulk Fe₉₀Zr₇B₃ and Fe₈₉Hf₇B₄ alloys were prepared by extruding amorphous powders through utilizing a softening phenomenon of an amorphous alloy near the crystallization temperature. The extruded bulk alloys are composed of an amorphous phase containing a small amount of bcc phase in an as-extruded state and the structure changes to a mostly single bcc phase with grain sizes from 10 to 25 nm by annealing at 923 K. The soft magnetic properties of the bulk alloys are better for the alloys containing a smaller volume fraction of bcc phase in as-extruded state. The Fe₉₀Zr₇B₃ alloy extruded at pressure of 860 MPa and temperature of 673 K has a high relative density above 99 %, and exhibits the permeabilities (μ_e) of 2350, flux density (B₈₀₀) of 1.59 T and the coercivity (H_c) of 26 A/m.

Original language	English
Pages (from-to)	127-132
Number of pages	6
Journal	Science Reports of the Rerearch Institutes Tohoku University Series A-Physics
Volume	42
Issue number	1
Publication status	Published - 1996 Mar
Externally published	Yes

Keywords

Amorphous powder
Consolidation
High saturation magnetization
Nanocrystalline phase
Soft-magnetic properties

ASJC Scopus subject areas

Condensed Matter Physics
Metals and Alloys

Cite this

Soft magnetic properties of bulk nanocrystalline Fe-(Zr,Hf)-B alloys produced by extruding amorphous powders. / Kojima, Akinori; Horikiri, Hidehiko; Kawamura, Yoshihito; Makino, Akihiro; Inoue, Akihisa; Masumoto, Tsuyoshi.

In: Science Reports of the Rerearch Institutes Tohoku University Series A-Physics, Vol. 42, No. 1, 03.1996, p. 127-132.

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

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title = "Soft magnetic properties of bulk nanocrystalline Fe-(Zr,Hf)-B alloys produced by extruding amorphous powders",

abstract = "The Bulk Fe90Zr7B3 and Fe89Hf7B4 alloys were prepared by extruding amorphous powders through utilizing a softening phenomenon of an amorphous alloy near the crystallization temperature. The extruded bulk alloys are composed of an amorphous phase containing a small amount of bcc phase in an as-extruded state and the structure changes to a mostly single bcc phase with grain sizes from 10 to 25 nm by annealing at 923 K. The soft magnetic properties of the bulk alloys are better for the alloys containing a smaller volume fraction of bcc phase in as-extruded state. The Fe90Zr7B3 alloy extruded at pressure of 860 MPa and temperature of 673 K has a high relative density above 99 %, and exhibits the permeabilities (μe) of 2350, flux density (B800) of 1.59 T and the coercivity (Hc) of 26 A/m.",

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AU - Kojima, Akinori

AU - Horikiri, Hidehiko

AU - Kawamura, Yoshihito

AU - Makino, Akihiro

AU - Inoue, Akihisa

AU - Masumoto, Tsuyoshi

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N2 - The Bulk Fe90Zr7B3 and Fe89Hf7B4 alloys were prepared by extruding amorphous powders through utilizing a softening phenomenon of an amorphous alloy near the crystallization temperature. The extruded bulk alloys are composed of an amorphous phase containing a small amount of bcc phase in an as-extruded state and the structure changes to a mostly single bcc phase with grain sizes from 10 to 25 nm by annealing at 923 K. The soft magnetic properties of the bulk alloys are better for the alloys containing a smaller volume fraction of bcc phase in as-extruded state. The Fe90Zr7B3 alloy extruded at pressure of 860 MPa and temperature of 673 K has a high relative density above 99 %, and exhibits the permeabilities (μe) of 2350, flux density (B800) of 1.59 T and the coercivity (Hc) of 26 A/m.

AB - The Bulk Fe90Zr7B3 and Fe89Hf7B4 alloys were prepared by extruding amorphous powders through utilizing a softening phenomenon of an amorphous alloy near the crystallization temperature. The extruded bulk alloys are composed of an amorphous phase containing a small amount of bcc phase in an as-extruded state and the structure changes to a mostly single bcc phase with grain sizes from 10 to 25 nm by annealing at 923 K. The soft magnetic properties of the bulk alloys are better for the alloys containing a smaller volume fraction of bcc phase in as-extruded state. The Fe90Zr7B3 alloy extruded at pressure of 860 MPa and temperature of 673 K has a high relative density above 99 %, and exhibits the permeabilities (μe) of 2350, flux density (B800) of 1.59 T and the coercivity (Hc) of 26 A/m.

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KW - High saturation magnetization

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Soft magnetic properties of bulk nanocrystalline Fe-(Zr,Hf)-B alloys produced by extruding amorphous powders

Abstract

Keywords

ASJC Scopus subject areas

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