|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Magnetic Materials for Energy and Power Conversion Applications
||Role of Ga on the Microstructure and Coercivity in Nd-rich Ga-doped Nd-Fe-B Sintered Magnets
||Taisuke Sasaki, Yukio Takada, Takashi Sato, Tadakatsu Ohkubo, Akira Kato, Yuji Kaneko, Kazuhiro Hono
|On-Site Speaker (Planned)
A Nd-rich Ga-doped Nd-Fe-B sintered magnet with a typical grain size of 6 m shows a high coercivity, 0Hc, of 1.8 T after optimal post-sinter annealing. While the high coercivity is mainly due to non-ferromagnetic grain boundary (GB) phase formation, there is still under debate on the effect of antiferromagnetic Nd6Fe13Ga phase at triple junction and Ga on the microstructure evolution. To clarify these points, we analyzed the microstructure of the Nd-rich Ga-doped Nd-Fe-B sintered magnets subjected to the post-sinter annealing at different temperatures. Although the areal fraction of the Nd6Fe13Ga phase varies depending on the annealing temperature, the variation is not consistent with that in the coercivity. Rather, the coercivity variation is closely related with the continuity of the non-ferromagnetic GB phase. Therefore, the high coercivity of the Nd-rich Ga-doped magnet can be explained by the continuous non-ferromagnetic GB phase formation rather than the formation of Nd6Fe13Ga phase.
||Planned: Supplemental Proceedings volume