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

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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Abstract

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.