Magnetic Properties of Extruded Nanocrystalline Fe-Nb-B Alloys.

章伸, 小島; 秀彦, 堀切; 能人, 河村; 彰宏, 牧野; 明久, 井上; 健, 増本

doi:10.3379/jmsjmag.18.457

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…A worthy method to manufacture bulk components is the consolidation of amorphous powders, [14][15][16] powders which can be obtained for example upon ball-milling or gasatomization. Moreover, with the progress of scientific and technological understanding of the glass-forming ability (GFA) of the metallic glasses, there have been developed several alloy systems having a GFA large enough to assure the preparation of bulk samples directly upon casting.…”

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confidence: 99%

Crystallization Kinetics of Fe76.5−x C6.0Si3.3B5.5P8.7Cu x (x = 0, 0.5, and 1 at. pct) Bulk Amorphous Alloy

Jung

Stoica

Sangbong

et al. 2014

Metall Mater Trans A

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The influence of Cu on crystallization kinetics of Fe 76.5Àx C 6.0 Si 3.3 B 5.5 P 8.7 Cu x (x = 0, 0.5, and 1 at. pct) bulk amorphous alloys was investigated by isothermal and isochronal differential scanning calorimetry combined with X-ray diffraction. The thermal analysis revealed that the crystallization of the amorphous matrix proceeds through at least two exothermic events. The Cufree glassy alloy forms by primary crystallization the metastable Fe 23 C 6 phase, while upon 0.5 at. pct Cu addition the primary crystallized phase is a-Fe. The activation energy for crystallization, calculated using both Kissinger and Ozawa methods, decreases from about 500 kJ/mol to about 330 kJ/mol. Further increase of Cu addition to 1 at. pct promotes the concomitant crystallization of several phases, as a-Fe, FeB, Fe 3 C, and Fe 2 P. In order to understand the crystallization behavior of the alloys as a function of Cu content, the Avrami exponent n, evaluated from the Johnson-Mehl-Avrami equation, was in details analyzed. The current study reveals that the minor Cu addition plays a crucial role at the initial stage of the crystallization. Among the studied alloys, the glassy samples with 0.5 at. pct Cu addition have the optimum compositional condition for the single a-Fe formation with a high nucleation rate.

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confidence: 99%

Crystallization Kinetics of Fe76.5−x C6.0Si3.3B5.5P8.7Cu x (x = 0, 0.5, and 1 at. pct) Bulk Amorphous Alloy

Jung

Stoica

Sangbong

et al. 2014

Metall Mater Trans A

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“…The studies of the nanocrystalline materials were mainly for ribbon form or thin film materials. To obtain a bulk form nanocrystalline material, an extruded alloy using a Fe-Nb-B powder was investigated [20]. This material is reported to have 64A/m of He and 1.5T of Bs.…”

Section: Nanocrystalline Magnetic Materialsmentioning

confidence: 99%