|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Advanced Magnetic Materials: An FMD Symposium in Honor of Michael E. McHenry
||Dy-free High Coercivity Nd-Fe-B Permanent Magnets
||Kazuhiro Hono, Taisuke Sasaki, Hossein Sepehri-Amin, Tadakatsu Ohkubo
|On-Site Speaker (Planned)
We will update our recent progress toward the development of high coercivity Nd-Fe-B permanent magnets without using heavy rare earth elements (HREE). To obtain complete understanding of the microstructure-coercivity relationships, we revisited the microstructures of Nd-Fe-B sintered and hot-deformed magnets using aberration-corrected STEM complemented by atom probe tomography (APT). In addition, we employed electron backscatter diffraction to determine (EBSD) the misorientation of the grain boundaries. We found that the structure and chemical composition of the grain boundary phase show strong orientation dependence, i.e., the grain boundary phase parallel to the c-planes are mostly crystalline with a higher Nd concentration in contrast to that lying parallel to the c-axis that contains higher Fe content with the amorphous structure. These investigations have suggested it is the key to decouple intergrain exchange decoupling along c-planes of anisotropy magnets. We will show examples of dechange decoupled Nd-Fe-B magnets.This work is supported by JST, CREST.
||Planned: None Selected