High-performance Ce-substituted (Nd0.7Ce0.3)-Fe-B hot-deformed magnets fabricated from amorphous melt-spun powders. (June 2022)

• Record Type: Journal Article
• Authors: Kim, Ga-Yeong; Kim, Tae-Hoon; Cha, Hee-Ryoung; Lee, Sang-hyub; Kim, Dong-Hwan; Kim, Yang-Do; Lee, Jung-Goo
• Is Part Of: Scripta materialia. Number 214(2022)
• Publication Date: 2022-06
• Subjects: Nd-Fe-B hot-deformed magnet -- Ce-substitution -- Amorphous melt-spun ribbon -- REFe2 phase -- Grain boundary phase; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114676
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We report a method to produce high-performance and cost-effective Ce-substituted Nd-Fe-B hot-deformed magnets with 30% Nd reduction. To suppress the formation of the Ce-dissolved REFe2 phase, which primarily limits [001] texture development and RE-rich grain boundary phase formation, amorphous melt-spun precursors were used to fabricate 30%-Ce-substituted hot-deformed magnets. By suppressing the formation of REFe2 phase from the precursors, the c-axis alignment of 2:14:1 platelets in the magnets due to grain boundary sliding and rotation improved, and the Nd/Ce-concentration of grain boundary phases in the magnets increased. As a result, both coercivity (Hcj ) and remanence (4πMr ) of the magnets noticeably increased to 15 kOe and 13 kG, respectively, in relation to those of the magnets fabricated from crystalline precursors containing an REFe2 phase (Hcj = 13.4 kOe, 4πMr = 12.1 kG). The magnetic performance of the 30%-Ce-substituted magnets developed in this work is sufficient to replace the N42M-graded commercial Ce-free magnets. Graphical abstract: Image, graphical abstract