Influence of La–Ce interaction effect on fabrication and diffusion processes of sintered RE–Fe–B magnets

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-09-29 DOI:10.1016/j.intermet.2025.109006

Xin Wang , Yan Li , Fei Liu , Jiaying Jin , Shunpeng Yao , Suo Bai , Yanli Liu , Zhubai Li , Yongfeng Li

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引用次数: 0

Abstract

To clarify the interaction effects of La and Ce in mixed-rare-earth (MM)-based sintered magnets, alloy strip castings and magnets were fabricated by partially substituting Pr/Nd with MM elements or individual La/Ce. Comprehensive analyses of phase compositions and microstructures were performed. The inherent instability of the La₂Fe₁₄B main phase and the formation of the REFe₂ phase were considerably suppressed due to La–Ce synergistic interactions, enabling the MM magnets to achieve a maximum remanence of 11.56 kGs. Sintering temperature studies revealed that magnets containing La and Ce exhibited improved main-phase stability compared to those containing only Ce or La. In addition, the RE-rich grain boundary (GB) phases—similar to the RE₃Ga phase, the RE₆(Fe,Ga)₁₄ phase and REFe₂ phase—were observed at GB junctions in MM and Ce80 (with 80 wt% RE content being Ce and 20 wt% being Pr/Nd) magnets, which affected the grain boundary diffusion depth. Following surface diffusion treatment with a Tb–Cu suspension, the coercivity of the MM magnet increased by 224 %. These results offer valuable insights for the design and development of high-performance sintered magnets with high La–Ce content and optimized microstructures.

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La-Ce相互作用对烧结RE-Fe-B磁体制备和扩散过程的影响

为了明确La和Ce在混合稀土（MM）基烧结磁体中的相互作用，用MM元素或单个La/Ce取代部分Pr/Nd，制备了合金带状铸件和磁体。进行了相组成和显微组织的综合分析。La - Ce的协同作用抑制了La2Fe14B主相的固有不稳定性和REFe2相的形成，使MM磁体的最大剩余量达到11.56 kg。烧结温度研究表明，与仅含有Ce或La的磁体相比，含有La和Ce的磁体具有更好的主相稳定性。此外，在MM和Ce80 （RE含量为80 wt%为Ce， 20 wt%为Pr/Nd）磁体的GB结处存在富RE晶界（GB）相，类似于RE3Ga相、RE6(Fe,Ga)14相和REFe2相，影响了晶界扩散深度。经Tb-Cu悬浮液表面扩散处理后，MM磁体的矫顽力提高了224%。这些结果为高La-Ce含量高性能烧结磁体的设计和开发以及微结构优化提供了有价值的见解。

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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.