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Grain size dependence of coercivity of hot-deformed Nd–Fe–B anisotropic magnets

Acta Materialia

2014年10月6日(月)
(2014.10.06 更新)

Acta Materialia ( Vol.82, 1 January 2015, P336–343 )
J. Liu, H. Sepehri-Amin, T. Ohkubo, K. Hioki, A. Hattori, T. Schrefl, K. Hono

Abstract

The dependence of the coercivity of hot-deformed anisotropic Nd–Fe–B magnets on grain sizehas been studied by processing the magnets at different temperatures. Higher coercivity wasobtained in fine-grained magnets processed at lower temperature (700 °C), in which intergranularphases formed uniformly along the grain boundaries. On the other hand, large Nd-rich triple-junction phases were frequently observed in the larger grain-sized magnets processed at highertemperature (900 °C). Three-dimensional atom probe analyses showed that the Nd content inthe intergranular phase decreased as the processing temperature increased. The origin of thecoercivity difference in these hot-deformed magnets processed at different temperatures isdiscussed based on micromagnetic analysis of the observed microstructures complemented withfinite-element micromagnetic simulations.

その他特記事項

This work was in part supported by Japan Science Technology Agency, CREST.


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元素戦略拠点

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触媒・電池元素戦略研究拠点 (京都大学)
東工大元素戦略拠点
東工大元素戦略拠点 (東京工業大学)
構造材料元素戦略研究拠点
構造材料元素戦略研究拠点 (京都大学)
高効率モーター用磁性材料技術研究組合
高効率モーター用 磁性材料技術研究組合