|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials
||Grain Boundary Chemistry of Dual Main Phase Nd-Ce-Fe-B As-sintered Magnets Revealed by Atom Probe Tomography
||Hansheng Chen, Rui Han, Shengzhi Dong, Fan Yun, Jiangtao Qu, Simon Ringer, Wei Li, Rongkun Zheng
|On-Site Speaker (Planned)
Incorporation of Ce, the cheapest rare earth element, in Nd-Fe-B sintered permanent magnet have attracted much attention from an economic viewpoint. Recently, coercivity of 0.93 T and magnetic product energy of 43 MGOe has been achieved with ~30.5 at.% of Ce substitution for Nd by applying the novel dual main phase (DMP) technique. However, it is not yet understood the influence of microstructure/microchemistry on the magnetic domain structure and coercivity of the DMP Nd-Ce-Fe-B magnet. Hence the aim of this work is to characterize the microstructure/microchemistry of the as-sintered DMP Nd-Ce-Fe-B magnet by correlating a broad spectrum of the-art-of-state microscopy techniques. The concentration of Fe+Co at the GB phase was observed to be as high as ~64.5 at.% via atom probe tomography. Furthermore, a slight segregation of Cu and Ga at the GB phase weakens the exchange coupling between the neighbouring matrix grains, and therefore enhances the coercivity.
||Planned: Supplemental Proceedings volume