磁场退火诱导 Ce-Fe-B 磁体的新型晶粒细化

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2024-10-21 DOI:10.1016/j.jmmm.2024.172607

Kehan Zhang, Zhongxing Mao, Haonan Li, Yubing Xia, Xiaohua Tan, Hui Xu

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引用次数: 0

摘要

磁场退火引起的晶粒细化通常发生在非晶态合金的结晶过程中。本研究调查了磁场退火对结晶 Ce17Fe76Co1Zr0.5B6Mo0.5 合金的微观结构和磁性能的影响。结果表明，低于合金中 Ce2Fe14B 相居里温度 (TC) 的磁场退火会减小合金的晶粒尺寸。退火温度为 433 K 时，合金的平均晶粒尺寸从原样纺丝样品的 48.0 nm 减小到磁场退火样品的 27.2 nm。此外，磁场退火还能有效降低合金中 CeFe2 相的体积分数。在 433 K 下进行磁场退火后，合金获得了最佳的综合磁性能：本征矫顽力（Hci = 441.1 kA/m）、剩磁（Br = 0.49 T）、方正度（Hk/Hci = 0.53）和最大能积（(BH)max) = 35.5 kJ/m3），分别比无纺丝样品的值高出 0.2%、16.7%、6% 和 29.1%。前驱电子衍射（PED）分析表明，磁场退火增加了晶界和相界的应变以及更均匀的晶粒取向分布（GOS），促进了再结晶和晶粒细化。这项研究为了解磁场退火下结晶合金的晶粒细化机制提供了新的视角，有助于进一步提高 Ce-Fe-B 磁体的磁性能。

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A novel grain refinement of Ce-Fe-B magnets induced by magnetic field annealing

Magnetic field annealing-induced grain refinement usually occurs during the crystallization process of amorphous alloys. This work investigates the effects of magnetic field annealing on the microstructure and magnetic properties of crystalline Ce₁₇Fe₇₆Co₁Zr_0.5B₆Mo_0.5 alloys. The results indicate that magnetic field annealing below the Curie temperature (T_C) of the Ce₂Fe₁₄B phase in the alloys reduces the alloy’s grain size. At an annealing temperature of 433 K, the average grain size of alloys decreased from 48.0 nm in the as-spun sample to 27.2 nm in the magnetic field annealing sample. Moreover, magnetic field annealing can effectively reduce the volume fraction of the CeFe₂ phase in the alloy. After magnetic field annealing at 433 K, the alloy obtained the optimal comprehensive magnetic properties: the intrinsic coercivity (H_ci = 441.1 kA/m), remanence (B_r = 0.49 T), squareness (H_k/H_ci = 0.53), and maximum energy product ((BH)_max) = 35.5 kJ/m³), which were 0.2 %, 16.7 %, 6 %, and 29.1 % higher than the values of the as-spun sample, respectively. Precession electron diffraction (PED) analysis revealed that magnetic field annealing increased strain at grain and phase boundaries and a more uniform grain orientation spread (GOS), promoting recrystallization and grain refinement. This study provides new insights into the grain refinement mechanism of crystalline alloys under magnetic field annealing, contributing to further improving the magnetic properties of Ce-Fe-B magnets.

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.