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IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-03-16 DOI:10.1016/j.intermet.2025.108733

Q.W. Zhu, Y.H. Hou, F.T. Ni, Y.Q. Xu, X.W. Liu, W. Li, J.M. Luo, Y.L. Huang

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引用次数: 0

摘要

晶界扩散（GBD）已被证明是提高烧结钕铁硼磁体矫顽力的有效方法，然而，基体成分也是影响矫顽力提高的一个重要因素，这一点尚未得到深入研究。在这项工作中，我们对采用 Pr70Ga15Cu15 合金进行晶界扩散的不同双主相（DMP）烧结磁体进行了比较研究。经过 GBD 后，La14 磁体的矫顽力从 3.9 kOe 增至 12.0 kOe，远高于 La0 磁体，是初始磁体的三倍多，而剩磁则同样下降。扫描电子显微镜和 EPMA 结果表明，两种磁体的主相晶粒周围都形成了富含镨的外壳和光滑的晶间相，从而提高了矫顽力。然而，对于 La0 磁体，磁体表面积累了大量的扩散源，并伴随着异常的晶粒生长，这阻碍了扩散源进入磁体，导致矫顽力降低。本研究中的扩散源对两种磁体的微观结构和磁性能的不同影响可为今后的研究提供实际指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Comparative investigation on microstructural and magnetic properties of Ce- and LaCe-based magnets by grain boundary diffusion with PrGaCu alloy

Grain boundary diffusion (GBD) has been proven to be an effective method for improving the coercivity of sintered Nd-Fe-B magnets, however, the matrix composition is also an important factor influencing the improvement of coercivity, which has not been thoroughly investigated. In this work, a comparative investigation is conducted on different dual main phase (DMP) sintered magnets by grain boundary diffusion with Pr₇₀Ga₁₅Cu₁₅ alloy. After GBD, the coercivity of La14 magnet increases from 3.9 kOe to 12.0 kOe, much higher than that of La0 magnet and more than three times that of initial magnet, with the same decrease in remanence. The SEM and EPMA results show that a Pr-rich shell around main phase grain and smooth intergranular phase has formed in both magnets, thereby contributing to the improvement of coercivity. However, for La0 magnet, a large number of diffusion sources accumulate on the surface of the magnet, accompanied by abnormal grain growth, which prevents the diffusion source from entering the magnet, resulting in lower coercivity. The different effects of diffusion source on microstructure and magnetic properties of two types of magnets in this study can provide practical guidance for future research.

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.