期刊
MATERIALS
卷 12, 期 24, 页码 -出版社
MDPI
DOI: 10.3390/ma12244235
关键词
grain boundary diffusion; Nd-Fe-B magnets; hydrogenation; microstructure; magnetic properties
类别
资金
- Ministry of Education, Youth and Sports of the Czech Republic [LTARF18031]
- Ministry of Science and Higher Education of the Russian Federation [14.616.21.0093, RFMEFI61618x0093]
- structural funds and the state budget of the Czech Republic [CZ.1.05/2.1.00/19.0387]
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)(2)Fe14B-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.
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