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The grain boundary diffusion process (GBDP) is one of the most efficient treatments for increasing the coercivity (Hc) of Nd-Fe-B magnets. However, this enhancement typically occurs at the expense of remanence (Mr). In this study, micromagnetic simulations were performed to quantify this tradeoff in hot-deformed Nd-Fe-B magnets subjected to the GBDP using a Nd-based eutectic alloy. The GBDP was imitated in a series of models with a gradually increasing volume fraction of the infiltrated Nd-rich nonmagnetic phase. The imitated infiltration reduced the remanence and grain connectivity via the remaining thin magnetic intergranular phase (IGP), which in turn increased the coercivity. We distinguished between the roles of exchange and magnetostatic interactions in this coercivity enhancement. Furthermore, the simulated Mr vs. Hc curves defined realistic limits for coercivity that depended on the IGP magnetization, which was estimated to be 0.9 ± 0.1 T by reproducing experimental Mr vs. Hc data from the literature.

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Keyword: Nd-Fe-B magnets, Micromagnetic simulations, Grain boundary diffusion process

Conference: The 5th International Symposium on Advanced Magnetic Materials and Applications (ISAMMA2024) (2024-08-04 - 2024-08-07)

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Manuscript type: Not a journal article

MDR DOI: https://doi.org/10.48505/nims.4854

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Updated at: 2024-10-16 16:30:42 +0900

Published on MDR: 2024-10-16 16:30:42 +0900