Correlative multi-scale characterization of a fine grained Nd-Fe-B sintered magnet

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• 作者：T.T. Sasaki ; T. Ohkubo ; K. Hono ; Y. Une ; M. Sagawa
• 关键词：Multi-scale characterization ; SEM ; TEM ; 3DAP
• 刊名：Ultramicroscopy
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：132
• 期：Complete
• 页码：222-226
• 全文大小：4173 K

文摘

The Nd-rich phases in pressless processed fine grained Nd-Fe-B sintered magnets have been characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and three dimensional atom probe tomography (3DAP). The combination of the backscattered electron (BSE) and in-lens secondary electron (IL-SE) images in SEM led to an unambiguous identification of four types of Nd-rich phases, NdO_x, type phase, which is isostructural to Nd₂O₃, dhcp-Nd and Nd₁Fe₄B₄. In addition, the 3DAP analysis of thin Nd-rich grain boundary layer indicate that the coercivity has a close correlation with the chemistry of the grain boundary phase.