Abstract The properties of RE-rich phase have important effects on the process and magnetic properties of NdFeB magnets. In this work, two MQ powders with different compositions were employed to fabricate hot pressed and hot-deformed magnets. The hot-deformed magnets produced from MQP-01 powders with Pr containing and Zr/Nb-free composition exhibit lower coercivity and less pinning effect compared to those from MQP-02 powders with Pr-free and Zr/Nb-containing composition, though the former has high rare earth (RE) content. These differences are attributed to the different mobilities of the RE-rich phase in the grain boundaries due to the composition difference. The RE-rich phase in MQP-01 powders has relatively good mobility, which leads to the aggregation of RE-rich phase and the open recoil loops for deformed magnets. On the contrary, relatively poor mobility of RE-rich phase in MQP-02 powders results in the thick and continuously distributed grain boundary phase in the hot-deformed magnets, which contributes to the strong pining effect and the high coercivity. The present results provide reference for optimizing the magnetic properties of hot deformed NdFeB type magnets.

中文翻译：

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了解基于两种不同熔纺粉末的热变形 Nd-Fe-B 磁体的成分影响

摘要 富RE相的性质对钕铁硼磁体的工艺和磁性能有重要影响。在这项工作中，使用两种不同成分的 MQ 粉末来制造热压和热变形磁体。与由含 Pr 和 Zr/Nb 组成的 MQP-02 粉末相比，由含 Pr 和无 Zr/Nb 组成的 MQP-01 粉末生产的热变形磁体表现出较低的矫顽力和较小的钉扎效应，尽管前者具有高稀土（RE）含量。这些差异归因于由于组成差异导致的富稀土相在晶界中的不同迁移率。MQP-01 粉末中的富稀土相具有较好的流动性，这导致富稀土相的聚集和变形磁体的开路反冲回路。相反，MQP-02 粉末中富稀土相的流动性相对较差，导致热变形磁体中晶界相较厚且连续分布，这有助于产生强钉扎效应和高矫顽力。研究结果可为优化热变形钕铁硼型磁体的磁性能提供参考。