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Development of ultra-fine grain sized SmFe12-based powders using hydrogenation disproportionation desorption recombination process

Volume 165, 15 February 2019, Pages 373-380

2019年2月15日(金)

I.Dirba H.Sepehri-Amin T.Ohkubo K.Hono ( https://doi.org/10.1016/j.actamat.2018.11.065 )

Abstract

SmFe12-based compounds possess promising intrinsic magnetic properties, even superior to those of Nd2Fe14B phase at elevated temperatures. However, the remaining challenge is to demonstrate that those intrinsic properties can be further developed into practically relevant extrinsic ones by proper processing. Here we have employed hydrogenation disproportionation desorption recombination (HDDR) process for preparation of ultrafine-grained SmFe12-based alloys with the tetragonal ThMn12-type crystal structure. The effect of alloying elements and grain boundary phase on disproportionation rate is investigated and experimental HDDR process phase diagram is proposed. Due to the high vapor pressure of Sm as well as the competing phases, recombination into phase-pure samples can be realized only in a narrow processing parameters window. The resultant phase constitutions, chemical composition, microsctructure and crystallographic relations at different process steps are discussed.



研究活動

文部科学省

文部科学省
元素戦略プロジェクト(活動紹介)
NIMS磁石パートナーシップ

元素戦略拠点

触媒・電池元素戦略拠点
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