Anisotropic behavior of grain boundary diffusion in hot-deformed Nd-Fe-B magnet

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• 作者：Tieqiao Zhang^a ; Fugang Chen^a ; Yan Zheng^a ; Hongyuan Wen^a ; Lanting Zhang^a ; ^b ; ^c ; ^{lantingzh@sjtu.edu.cn} ; Ligang Zhou^d
• 关键词：Nd-Fe-B ; Coercivity ; Grain boundary ; Anisotropic diffusion ; Microstructure
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：129
• 期：Complete
• 页码：1-5
• 全文大小：1656 K
• 卷排序：129

文摘

Grain boundary diffusion process using Nd70Cu30 was applied to the c-plane and ab-plane of hot-deformed Nd-Fe-B magnet. The coercivity was increased from 1.38 T to 2.44 and 2.20 T for the ab-plane and c-plane diffused specimens, respectively. The corresponding diffusion depth characterized by Cu content in the magnet was about 4.5 and 2.3 mm for the two specimens. Hierarchical coupling between “river-like” Nd-rich phase on the powder flake surface in micron-scale with the diffusion channels at the grain boundaries and triple junctions of the matrix grains in nano-scale is the fundamental cause of the anisotropic grain boundary diffusion behavior.