Microstructure evolution and properties optimization of (Sm0.75Zr0.25)(Fe0.8Co0.2)11Ti nanocrystalline magnets produced via hot-pressing sintering

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-10-01 DOI:10.1016/j.matchar.2025.115606

L. Huang, Y.H. Hou, Z.P. Xu, J.P. Liu, X.Y. Cheng, W.Y. Yu, Y.F. Huang, W. Li, J.M. Luo, Y.L. Huang

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引用次数: 0

Abstract

The ThMn₁₂-type SmFe₁₂-based compound exhibits remarkable intrinsic magnetic properties, making it a promising candidate for advanced magnets. However, the production of bulk magnets with superior magnetic properties remains challenging due to its thermodynamic instability. This work fabricated (Sm_0.75Zr_0.25)(Fe_0.8Co_0.2)₁₁Ti nanocrystalline magnets via hot-pressing sintering, revealing microstructure-properties relationships. Specimens sintered for 20 min achieved maximal 1:12 phase content, uniform microstructure, and high density, yielding optimal room-temperature magnetic properties: a coercivity of 4.46 kOe, a maximum magnetic energy product of 49 kJ/m³, and exceptional thermal stability. Additionally, this research shows that the presence and increased content of twinned grains hinder improved magnetic properties. These findings shed light on fabricating isotropic nanocrystalline sintered magnets and offer critical guidance for optimizing the microstructure of ThMn₁₂-type magnet.

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热压烧结制备（Sm0.75Zr0.25）（Fe0.8Co0.2）11Ti纳米晶磁体的组织演变与性能优化

thmn12型smfe12基化合物具有显著的内在磁性，使其成为先进磁体的有希望的候选者。然而，由于其热力学不稳定性，具有优异磁性能的体磁铁的生产仍然具有挑战性。通过热压烧结制备了（Sm0.75Zr0.25）（Fe0.8Co0.2）11Ti纳米晶磁体，揭示了微观结构与性能的关系。烧结20分钟的试样获得了最大1:12相含量，均匀的微观结构和高密度，产生了最佳的室温磁性能：矫顽力为4.46 kOe，最大磁能积为49 kJ/m3，以及出色的热稳定性。此外，本研究表明，孪生晶粒的存在和含量的增加阻碍了磁性能的提高。这些发现为制备各向同性纳米晶烧结磁体提供了思路，并为优化thmn12型磁体的微观结构提供了重要的指导。

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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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.