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Bulk anisotropic nanocomposite magnets prepared by hot-deformation processing of amorphous alloys
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10.1063/1.3268446
/content/aip/journal/jap/106/11/10.1063/1.3268446
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/11/10.1063/1.3268446
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Figures

Image of FIG. 1.
FIG. 1.

Technological chains of hot-deformation processing of amorphous at (a) a uniaxial stress of and (b) a strain rate of at for 2 min.

Image of FIG. 2.
FIG. 2.

Temperature dependence of magnetic properties of bulk nanocomposite magnets yielded by deforming amorphous at a strain rate of for 2 min. The magnetic properties were measured parallel and perpendicular to the stress direction.

Image of FIG. 3.
FIG. 3.

Compressive stress dependence of magnetic properties of bulk nanocomposite magnets prepared by deforming amorphous at for 2 min. The magnetic properties were measured parallel and perpendicular to the stress direction.

Image of FIG. 4.
FIG. 4.

Demagnetization curves of bulk nanocomposite magnets yielded by deforming amorphous at (a) a uniaxial stress of and (b) a strain rate of as well as (c) by annealing as-compacted amorphous at for 2 min. These magnets are marked as FCHD, SCHD, and NA magnets, respectively. The demagnetization curves were measured parallel and perpendicular to the stress direction. The FCHD magnets show a strong magnetic anisotropy as compared with the SCHD and NA magnets.

Image of FIG. 5.
FIG. 5.

XRD patterns of (a) FCHD magnets, (b) SCHD magnets, and (c) NA magnets. The XRD measurements were performed on the magnet surface perpendicular to the stress direction. As-compacted bulk samples possess an amorphous structure [see the inset of (c)]. The (004) peak of the phase in the FCHD and SCHD magnets has a high relative intensity as compared with that in the NA magnets.

Image of FIG. 6.
FIG. 6.

(200), (004), and (410) pole figures of the phase in (a) FCHD magnets, (b) SCHD magnets, and (c) NA magnets. The pole figures were calculated by employing the Rietveld refinement procedure using the MAUD software according to the XRD spectra measured on the magnets. A strong (004) texture of phase is observed in the FCHD magnets, while it disappears in the NA magnets. No obvious (200) and (410) textures for the phase develop in the magnets.

Image of FIG. 7.
FIG. 7.

TEM bright-field images and SAED patterns of (a) FCHD magnets, (b) SCHD magnets, and (c) NA magnets. The TEM specimens were cut parallel to the stress direction. Many elongated and aligned nanocrystals with a long axis of 35–50 nm and a short axis of 18–25 nm (indicated by the white arrows) appear in the FCHD magnets and some strong (006) patterns are observed [see the SAED patterns in (a)].

Image of FIG. 8.
FIG. 8.

The 3D shapes of and nanocrystals in (a) FCHD magnets, (b) SCHD magnets, and (c) NA magnets. The nanocrystal 3D shape was calculated by employing the Rietveld refinement procedure using the MAUD software according to the XRD spectra measured on the magnets. A platelet-shaped nanocrystal is displayed in the FCHD magnets, while an equiaxed nanocrystal is observed in the NA magnets. All magnets show an equiaxed nanocrystal.

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/content/aip/journal/jap/106/11/10.1063/1.3268446
2009-12-09
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Bulk anisotropic Nd2Fe14B/α-Fe nanocomposite magnets prepared by hot-deformation processing of amorphous alloys
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/11/10.1063/1.3268446
10.1063/1.3268446
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