Hard magnetic properties of nanocrystalline Fe-rich Fe-Nb-Nd-B bulk alloys produced by consolidating amorphous powders
1997; Elsevier BV; Volume: 8; Issue: 8 Linguagem: Inglês
10.1016/s0965-9773(98)00049-x
ISSN1872-9150
AutoresA. Kojima, A. Makino, Akihisa Inoue,
Tópico(s)Magnetic properties of thin films
ResumoNanocrystalline bulk Fe88Nb2Nd5B5 and Fe76Co10Nb2Nd7B5 magnets were made by consolidating amorphous powders using an electric-pulse-current-sintering method and subsequent annealing. The bulk alloys made by consolidating amorphous powders have high densities of 7.65–7.7 × 103 kg/m3 despite the relatively low sintering temperature, presumably due to the high deformability of amorphous alloy near the crystallization temperature. The structure formed after annealing at 1023 K for 180 s shows a nanocrystalline composite consisting of bcc-Fe, Nd2Fe14B, and Fe3B or Fe2B phases with grain sizes of 20–40 nm. The nanocrystalline bulk Fe76Co10Nb2Nd7B5 alloy shows anisotropic hard magnetic properties and the maximum energy product (BH)max measured parallel to the press direction are 80 and 72 kJ/m3 for Fe88Nb2Nd5B5 and Fe76Co10Nb2Nd7B5, respectively.
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