Microstructure, coercivity and thermal stability of nanostructured (Nd,Ce)-(Fe,Co)-B hot-compacted permanent magnets
Source abstract
Abstract
We report on microstructure, hard magnetic properties and thermal stability of nanocrystalline (Nd 0.85Ce 0.15) 15(Fe 1- xCo x) 78B 7 ( x = 0 – 1) hot-compacted permanent magnets. At lower Co concentrations ( x < 0.3), the substitution of Fe by Co changes the composition of grain boundary phase from non-magnetic (Nd,Ce) 2Fe 1 to magnetic (Nd,Ce) 1(Fe,Co) 2, leading to the degrading of the coercivity. At x ≥ 0.6, the grain boundary phase is no longer observed between the nanocrystalline grains, resulting in strong magnetic coupling of constituent phases. With the further increase of Co concentration ( x>0.6), additional RE(Fe,Co) 2, RE(Fe,Co) 4B and RECo 5 phases are gradually formed in the magnets. A new type of microstructure with nanograins of RE 2(Fe,Co) 14B phase, RE(Fe,Co) 2 phase and RE(Fe,Co) 4 B phase, with partial or without grain boundary phase shows good thermal stability ( x = 0.4 and 0.6). In (Nd 0.85Ce 0.15) 15(Fe 0.4Co 0.6) 78B 7 magnets, the absolute values of temperature coefficient of coercivity | β | can reach 0.3 %/K within the temperature range of 300 K - 500 K, and it exceeds 0.23 %/K for the temperature range of 300 K - 650 K, indicating a promising method for designing highly thermal stable permanent magnets.
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Research context
OpenAlex topics: Magnetic Properties of Alloys · Magnetic Properties and Applications · Rare-earth and actinide compounds
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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