Abstract The technology of using high abundance rare earth element Ce in permanent magnets has attracted many concerns. In this work, the magnetic properties and microstructures of hot deformed (Nd1-xCex)13.8Fe76.1Co4Ga0.5B5.6 magnets and a selective magnet treated with PrCu grain boundary diffusion process (GBDP) were investigated systematically. It is found that Ce is beneficial to improving the plastic deformation ability of NdFeB magnets. The strongest c-axis orientation is achieved in the HD magnets with Ce concentration of x = 0.3, resulting in good comprehensive magnetic properties of Br = 13.00 kGs, Hcj = 10.12 kOe, (BH)max = 38.42 MGOe. Based on that, the GBDP was implemented on the magnets with the best orientation using Pr68Cu32 ribbons and the magnetic properties of Br = 12.87 kGs, Hcj = 15.65 kOe, (BH)max = 37.48 MGOe were obtained. The results of composition distribution and Curie temperature test of the GBDPed magnets illustrate that Pr diffuses into the (Nd,Ce)2(Fe,Co)14B grains to substitute Ce, which not only improves the Curie temperature of the grains, but also enhances the magnetic performance of the magnets. Through GBDP, the thermal stability of magnets has also been improved.

中文翻译：

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PrCu合金晶界扩散对热变形(Nd,Ce)-Fe-B磁体组织和矫顽力的影响

摘要 在永磁体中使用高丰度稀土元素Ce的技术引起了很多关注。在这项工作中，系统地研究了热变形 (Nd1-xCex)13.8Fe76.1Co4Ga0.5B5.6 磁体和经 PrCu 晶界扩散工艺 (GBDP) 处理的选择性磁体的磁性能和微观结构。发现Ce有利于提高NdFeB磁体的塑性变形能力。在Ce浓度为x = 0.3的HD磁体中实现了最强的c轴取向，导致Br = 13.00 kGs，Hcj = 10.12 kOe，(BH)max = 38.42 MGOe的良好综合磁性能。在此基础上，使用 Pr68Cu32 带在具有最佳取向的磁体上实施 GBDP，获得了 Br = 12.87 kGs、Hcj = 15.65 kOe、(BH)max = 37.48 MGOe 的磁性能。GBDPed磁体的成分分布和居里温度测试结果表明，Pr扩散到（Nd，Ce）2（Fe，Co）14B晶粒中取代Ce，不仅提高了晶粒的居里温度，而且增强了磁铁的磁性能。通过GBDP，磁铁的热稳定性也得到了提高。