TY - JOUR
T1 - Hard magnetic properties of nanocrystalline Fe-rich Fe-Nb-Nd-B bulk alloys produced by consolidating amorphous powders
AU - Kojima, A.
AU - Makino, A.
AU - Inoue, A.
PY - 1997/12
Y1 - 1997/12
N2 - Nanocrystalline 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.
AB - Nanocrystalline 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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U2 - 10.1016/S0965-9773(98)00049-X
DO - 10.1016/S0965-9773(98)00049-X
M3 - Article
AN - SCOPUS:0031380156
VL - 8
SP - 1015
EP - 1024
JO - Nanostructured Materials
JF - Nanostructured Materials
SN - 0965-9773
IS - 8
ER -