Structural and magnetic properties of nanocrystalline Fe-rich Fe-Nb-Nd-B sintered magnets produced by consolidating amorphous powders
- Tohoku Univ., Sendai (Japan)
- Alps Electric Co., Ltd., Nagaoka (Japan). Central Research Lab.
Nanocrystalline bulk Fe{sub 88}Nb{sub 2}Nd{sub 5}B{sub 5} and Fe{sub 86}Nb{sub 2}Nd{sub 7}B{sub 5} alloys were made by consolidating amorphous powders with an electric-pulse-current-sintering method and subsequent annealing. Bulk alloy made by consolidating amorphous powders has a higher density (the maximum density could reach 7.5 g/cm{sup 3} consolidating at 873 K and 636 MPa) than that made by consolidating crystalline powders, presumably because the amorphous alloy softens around the crystallization temperature. The structure formed after annealing at 1,023 K for 180 s shows a nanocrystalline composite consisting of bcc-Fe, Nd{sub 2}Fe{sub 14}B and Fe{sub 3}B or Fe{sub 2}B phases with grain sizes of 20--40 nm. The nanocrystalline bulk Fe{sub 88}Nb{sub 2}Nd{sub 5}B{sub 5} alloy shows hard magnetic properties, remanence (J{sub r}) of 1.05 T, coercive force (H{sub cJ}) of 263 kA/m, and maximum energy product ((BH){sub max}) of 75 kJ/m{sup 3}.
- OSTI ID:
- 566404
- Report Number(s):
- CONF-970468-; ISSN 0018-9464; TRN: IM9805%%114
- Journal Information:
- IEEE Transactions on Magnetics, Vol. 33, Issue 5Pt2; Conference: 1997 IEEE international magnetics conference (Intermag `97), New Orleans, LA (United States), 1-4 Apr 1997; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
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