Coercivities of hot-deformed magnets processed from amorphous and nanocrystalline precursors

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• 作者：Xin Tang^a ; ^b ; H. Sepehri-Amin^a ; T. Ohkubo^a ; K. Hioki^c ; A. Hattori^c ; K. Hono^a ; ^b ; ^{kazuhiro.hono@nims.go.jp" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Permanent magnet ; Nd-Fe-B ; Coercivity ; Hot deformation ; Meltspinning
• 刊名：Acta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：123
• 期：Complete
• 页码：1-10
• 全文大小：5110 K

文摘

Hot-deformed magnets have been processed from amorphous and nanocrystalline precursors and their hard magnetic properties and microstructures have been investigated in order to explore the optimum process route. The hot-deformed magnets processed from an amorphous precursor exhibited the coercivity of 1.40 T that is higher than that processed from nanocrystalline powder, ∼1.28 T. The average grain size was larger in the magnets processed from amorphous precursor. Detailed microstructure analyses by aberration corrected scanning transmission electron microscopy revealed that the Nd + Pr concentrations in the intergranular phases were higher in the hot-deformed magnet processed from the amorphous precursor, which is considered to lead to the enhanced coercivity due to a stronger pinning force against magnetic domain wall motion.