Coercivity enhancement of nanocrystalline Ce-based magnets utilizing simplified one-step hot deformation process

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-07-27 DOI:10.1007/s12598-024-02907-2

Xue-Feng Liao, Qing Zhou, Wei-Wei Zeng, Bang Zhou, Hong-Ya Yu, Wei-Da Huang, Wen-Bing Fan, Jia-Sheng Zhang, Zhong-Wu Liu

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引用次数: 0

Abstract

Nanocrystalline Ce-based rare earth (RE)–Fe–B alloys exhibit relatively good hard magnetic properties and high performance–cost ratio, but their properties deteriorate seriously after hot deformation (HD). Here, we present a simplified one-step HD process for preparing anisotropic Ce-based Ce_25.88La_2.85Y_4.56Fe_65.73B_0.98 (wt%) magnets. The precursor of nanocrystalline powders is first compacted inside a copper tube, and then the powders with the tube are deformed together to achieve magnetic anisotropy. Compared with the conventional two-step HD magnet, i.e., hot pressing followed by HD, one-step HD significantly increased the coercivity from 1.6 to 3.0 kOe, and the maximum magnetic energy product was improved from 3.7 to 4.8 MGOe. The microstructure characterization indicates that one-step HD can not only produce a more desirable microstructure, characterized by well-aligned platelet-shaped grains with reduced aspect ratio but also greatly inhibit the formation of coarse grain (CG) region. Both of them have been confirmed to be beneficial to enhancing coercivity by micromagnetic simulations. Our results thus demonstrate that the simplified one-step HD process offers a promising approach to developing high-performance anisotropic Ce-based magnets.

Graphical abstract

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利用简化的一步热变形工艺提高纳米晶 Ce 基磁体的矫顽力

纳米晶 Ce 基稀土 (RE)-Fe-B 合金具有相对较好的硬磁性能和较高的性能价格比，但其性能在热变形 (HD) 之后会严重恶化。在此，我们提出了一种简化的一步法 HD 工艺，用于制备各向异性的铈基 Ce25.88La2.85Y4.56Fe65.73B0.98 (wt%) 磁体。首先将纳米结晶粉末的前驱体压制在铜管内，然后将粉末与铜管一起变形以实现磁性各向异性。与传统的两步式 HD 磁体（即先热压后 HD）相比，一步式 HD 磁体的矫顽力从 1.6 kOe 显著提高到 3.0 kOe，最大磁能积从 3.7 MGOe 提高到 4.8 MGOe。微观结构表征表明，一步法 HD 不仅能产生更理想的微观结构，即长宽比降低的排列整齐的板状晶粒，还能极大地抑制粗晶粒（CG）区的形成。微磁模拟证实，这两种方法都有利于提高矫顽力。因此，我们的研究结果表明，简化的一步高清工艺为开发高性能各向异性铈基磁体提供了一种可行的方法。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.