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Open AccessArticle

Application of a Dy3Co0.6Cu0.4Hx Addition for Controlling the Microstructure and Magnetic Properties of Sintered Nd-Fe-B Magnets

1
VSB–Technical University of Ostrava, Faculty of Materials Science and Technology, 70800 Ostrava, Czech Republic
2
Joint Stock Company «Spetsmagnit», Moscow 127238, Russia
3
Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow 119334, Russia
4
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50–422 Wroclaw, Poland
*
Author to whom correspondence should be addressed.
Materials 2019, 12(24), 4235; https://doi.org/10.3390/ma12244235
Received: 14 November 2019 / Revised: 11 December 2019 / Accepted: 15 December 2019 / Published: 17 December 2019
(This article belongs to the Special Issue Advanced Powder Metallurgy Technologies)
The focus of new technologies on the formation of inhomogeneous distributions of heavy rare-earth metals (REMs) in hard magnetic Nd–Fe–B materials is of scientific importance to increase their functional properties, along with preserving existing sources of heavy REMs. This paper focused on the coercivity enhancement of Nd2Fe14B-based magnets by optimizing the microstructure, which includes the processes of grain boundary structuring via the application of a Dy3Co0.6Cu0.4Hx alloy added to the initial Nd–Fe–B-based powder mixtures in the course of their mechanical activation. We have studied the role of alloying elements in the formation of phase composition, microstructure, the fine structure of grains, and the hysteretic properties of hard magnetic Nd(R)2Fe14B-based materials. It was shown that the Dy introduction via the two-component blending process (the hydrogenated Dy3Co0.6Cu0.4 compound is added to a powder mixture) resulted in the formation of the core-shell structure of 2–14–1 phase grains. The efficient improvement of the coercivity of Nd(RE)–Fe–B magnets, with a slight sacrifice of remanence, was demonstrated. View Full-Text
Keywords: grain boundary diffusion; Nd–Fe–B magnets; hydrogenation; microstructure; magnetic properties grain boundary diffusion; Nd–Fe–B magnets; hydrogenation; microstructure; magnetic properties
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Skotnicova, K.; Prokofev, P.A.; Kolchugina, N.B.; Burkhanov, G.S.; Lukin, A.A.; Koshkid’ko, Y.S.; Cegan, T.; Drulis, H.; Romanova, T.; Dormidontov, N.A. Application of a Dy3Co0.6Cu0.4Hx Addition for Controlling the Microstructure and Magnetic Properties of Sintered Nd-Fe-B Magnets. Materials 2019, 12, 4235.

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