Achieving enhanced comprehensive magnetic performance by synergistically regulating microstructure and composition for multi-main-phase Nd-Ce-Fe-B magnet with DyF3 and Cu

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL Intermetallics Pub Date : 2025-06-01 Epub Date: 2025-03-04 DOI:10.1016/j.intermet.2025.108730

X.G. Cui , J.W. Li , H.J. Zhang , W.J. Liang , X.L. Peng , L.Z. Zhao , J. Li , J.J. Ni , C.Y. Cui

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Abstract

Aiming at further improving the comprehensive magnetic performance of multi-main-phase (MMP) Nd-Ce-Fe-B magnets with DyF₃ and Cu, a strategy to synergistically regulating microstructure and composition via sintering temperature (T_s) has been proposed. The results demonstrate that superior magnetic properties can be achieved over a wide T_s range of 700 °C–750 °C. The remanence B_r and maximum energy product (BH)_max both increase continuously as the T_s rises to 700 °C. However, the intrinsic coercivity H_cj attains its maximum value at 750 °C, and the preferable B_r and (BH)_max close to their optimum values are achieved together. Microstructural and compositional characterizations indicate that the increased T_s not only promotes magnet densification and Dy diffusion, but also exacerbates grain growth and Nd/Ce inter-diffusion. Moreover, the added DyF₃ and Cu helps to suppress abnormal grain growth and Nd/Ce inter-diffusion, resulting in maintaining proper grain structure and chemical heterogeneity over a wide T_s range. The balances of the densification, grain size, Nd/Ce inter-diffusion, and Dy diffusion contribute to achieving enhanced comprehensive magnetic performance over a wide T_s range of 700 °C–750 °C. This work sheds light on the evolutions of microstructure, composition, and magnetic properties of grain-boundary-engineered MMP Nd-Ce-Fe-B magnets with T_s, and may open a new avenue for further improving the magnetic properties of commercial low-cost Nd-Ce-Fe-B magnets.

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DyF3和Cu协同调节多主相Nd-Ce-Fe-B磁体的微观结构和成分，提高磁体的综合磁性能

为了进一步提高含有DyF3和Cu的多主相（MMP） Nd-Ce-Fe-B磁体的综合磁性能，提出了通过烧结温度（Ts）协同调节组织和成分的策略。结果表明，在700°C - 750°C的宽Ts范围内，可以获得优越的磁性能。随着温度升高到700℃，残余Br和最大能积（BH）max都在不断增加。而在750℃时，其固有矫顽力Hcj达到最大值，Br和（BH）max同时达到较优值。显微组织和成分表征表明，Ts的增加不仅促进了磁体致密化和Dy扩散，而且加剧了晶粒生长和Nd/Ce互扩散。此外，添加DyF3和Cu有助于抑制异常晶粒生长和Nd/Ce相互扩散，从而在较宽的Ts范围内保持适当的晶粒结构和化学非均质性。致密化、晶粒尺寸、Nd/Ce间扩散和Dy扩散的平衡有助于在700°C - 750°C的宽Ts范围内获得增强的综合磁性能。本研究揭示了含Ts晶界工程MMP Nd-Ce-Fe-B磁体的微观结构、成分和磁性能的演变，为进一步提高商用低成本Nd-Ce-Fe-B磁体的磁性能开辟了新的途径。

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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.