Abstract We demonstrate a 20% Ce-substituted Nd-Fe-B hot-deformed magnet with a large coercivity (µ0Hc) of 1.69 T and a remanent magnetization of 1.32 T, which are comparable to those for Nd-Fe-B sintered magnets. The temperature coefficient of coercivity (β) of the Ce-substituted magnet was -0.593%/°C in the range of 27–127 °C, which is superior to that of a Nd-Fe-B sintered magnet (β = -0.669%/°C) with a comparable coercivity at room temperature. Furthermore, the coercivity and its thermal stability can be increased to µ0Hc =1.83 T and β = -0.51%/°C by applying the Nd80Cu20 eutectic grain boundary diffusion process to an optimized (Nd0.75Ce0.25)-Fe-B hot-deformed sample. A coercivity of 0.74 T was achieved at 150 °C in the Nd-Cu diffusion processed hot-deformed magnets, which is much higher than that of sintered magnets. Microstructure investigations and micromagnetic simulations indicate that the modification of grain boundary phase and formation of a Nd-rich shell near the grain boundaries of the developed (Nd,Ce)-Fe-B hot-deformed magnet is the cause of the improved coercivity at room temperature. Thus, in this work, we realize a microstructure-optimized low-cost (Nd0.8Ce0.2)-Fe-B hot-deformed magnet that can outperform Nd-Fe-B sintered magnets.

中文翻译：

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热稳定的高矫顽力 Ce 取代热变形磁体，Nd 减少 20%

摘要 我们展示了 20% Ce 取代的 Nd-Fe-B 热变形磁体，具有 1.69 T 的大矫顽力 (µ0Hc) 和 1.32 T 的剩磁，可与 Nd-Fe-B 烧结磁体相媲美。Ce取代磁体的矫顽力温度系数（β）在27-127°C范围内为-0.593%/°C，优于Nd-Fe-B烧结磁体（β = -0.669 %/°C）在室温下具有相当的矫顽力。此外，通过将 Nd80Cu20 共晶晶界扩散工艺应用于优化的 (Nd0.75Ce0.25)-Fe-B 热-变形样品。Nd-Cu 扩散处理的热变形磁体在 150°C 下的矫顽力为 0.74 T，远高于烧结磁体。显微组织研究和微磁模拟表明，晶界相的改变和在发达的 (Nd,Ce)-Fe-B 热变形磁体的晶界附近形成富含 Nd 的壳是提高室温矫顽力的原因。温度。因此，在这项工作中，我们实现了一种微观结构优化的低成本 (Nd0.8Ce0.2)-Fe-B 热变形磁体，其性能优于 Nd-Fe-B 烧结磁体。