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説明:

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. This 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.

権利情報:

• In Copyright
  

キーワード: Micromagnetic simulation , Permanent magnet, Nd-Fe-B, Grain boundary diffusion process

刊行年月日: 2024-03-30

出版者: Elsevier BV

掲載誌:

• Scripta Materialia (ISSN: 13596462) vol. 247 116095

研究助成金:

• Japan Society for the Promotion of Science
• Government of Japan Ministry of Education Culture Sports Science and Technology

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.4676

公開URL: https://doi.org/10.1016/j.scriptamat.2024.116095

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更新時刻: 2024-08-23 12:30:14 +0900

MDRでの公開時刻: 2024-08-23 12:30:14 +0900