Microstructure analysis of a Ga-doped Nd-Fe-B magnet with 2T coercivity
日本金属学会2017年秋期講演大会
XU Xiandong(NIMS), SASAKI Taisuke(NIMS), KIM Tae-Hoon(NIMS), OHKUBO Tadakatsu(NIMS), HONO Kazuhiro(NIMS)
Abstract
【Introduction】Recently, we reported that the trace addition of Ga (0.5 at.%) substantially enhanced the coercivity due to the magnetic decoupling between the neighboring Nd2Fe14B grains by the formation of non-ferromanetic grain boundary (GB) phase [1]. However, there is a demand to optimize the Ga content since the excessive Ga addition results in the formation of Nd6Fe13Ga phase that leads to the decrease in the remanent magnetization. In this presentation, we present a microstructure and magnetic property of a high coercivity Nd-Fe-B sintered magnet with less addition of Ga.
【Experiments】The chemical composition of the sample used in this work is Nd11.52Pr3.20Fe77.12 Co0.96B5.55Cu0.21Al1.30Ga0.14. Microstructure observation was performed using a field emission SEM, Carl Zeiss Cross
