Improving intergranular phase and enhanced coercivity: a grain boundary diffusion of non-heavy rare earth PrNdAl alloy in sintered Nd-Fe-B magnets
Improving intergranular phase and enhanced coercivity: a grain boundary diffusion of non-heavy rare earth PrNdAl alloy in sintered Nd-Fe-B magnets
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DOI：
10.1016/j.jmrt.2022.11.056
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Y.L. Huang;Y. Yao;F.Y. Wang;H.F. Li;Z. Wu;Q. Feng;W. Li;J.M. Luo;Z. Pang;C. Zhong;Y. Hou
中科院分区：
文献类型：
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作者：
Y.L. Huang;Y. Yao;F.Y. Wang;H.F. Li;Z. Wu;Q. Feng;W. Li;J.M. Luo;Z. Pang;C. Zhong;Y. Hou
组织优化是提高材料导电性的重要策略。本文选用非重稀土PrNdAl合金作为扩散源，以提高合金的导电性，改善合金的显微组织。结果表明，PrNdAl合金的扩散可显著提高样品的矫顽力，比制备态样品提高了31.1%. PrNdAl合金的扩散不改变三结区晶界相的晶体结构。三个因素有助于提高结晶度。一是由于（Nd，Pr）2Fe 14 B壳层的形成，增强了主相晶粒表面的磁硬化;二是由于富稀土相Fe含量的减少，导致晶间交换耦合减弱。晶粒间连续富稀土相的形成有助于磁隔离效应的增强。此外，还研究了合金元素的冶金行为和晶间相的演变。
The optimization of microstructure is an important strategy to improve the coercivity. In this paper, non-heavy rare earth PrNdAl alloy was selected as the diffused source to enhance the coercivity and improve the microstructure. The results show that the diffusion of PrNdAl alloy can greatly enhance the coercivity, achieving an increment of 31.1% compared to that of as-prepared sample. The diffusion of PrNdAl alloy does not change the crystal structure of intergranular phase in the triple-junction region. Three factors contribute to the improvement of coercivity. One is the enhancement of magnetic hardening of main phase grain surface, owing to the formed (Nd, Pr)2Fe14B shell. The other is the weakening of intergranular exchange coupling among grains, which is aroused by the reduced Fe content in RE-rich phase. The last is that the formed continuous RE-rich phase between grains contribute to the enhancement of magnetic isolation effect. In addition, the metallurgical behavior of elements and the evolution of intergranular phase are investigated.