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Report No.

Small angle neutron scattering study of interface nanostructure in sintered Nd-Fe-B magnets processed under high magnetic fields

Akiya, Takahiro*; Kato, Hiroaki*; Takeda, Masayasu  ; Suzuki, Junichi; Yamaguchi, Daisuke; Koizumi, Satoshi; Sagawa, Masato*; Koyama, Keiichi*

Sintered Nd-Fe-B magnets are the most promising materials for a driving motor of the hybrid electric vehicles(HV). In this application, a large value of coecivity $$H_{c}$$ is required because of the high operating temperature beyond 450 K. As a symptomatic treatment, Nd has been replaced partly by Dy to enhance $$H_{c}$$. But the problem is an estimated short supply of Dy in the HV mass-production stage due to its low natural abundance. We have recently shown that $$H_{c}$$ of Nd-Fe-B magnets can be enhanced by applying a high magnetic field during the annealing. In order to elucidate the reason for the $$H_{c}$$ increase, we performed a small angle neutron scattering (SANS) study using SANS-J and PNO at JRR-3 of JAEA. We observed a marked deviation from the simple relation above for $$q > 0.3 nm^{-1}$$ in the sample with Al and Cu additives. SANS results suggest that an existence of the Cu-containing liquid phases is strongly correlated with the $$H_{c}$$ enhancement by the high field annealing.



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