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 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL Intermetallics Pub 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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引用次数: 0

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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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.