Nd-Fe-B烧结磁体的晶界结构及其演化

IF 2.1 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Magnetics Pub Date : 2025-02-19 DOI:10.1109/TMAG.2025.3543812

Anhua Li;Yanru Li;Haibo Feng;Wei Li

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引用次数: 0

摘要

本文在多尺度下对成分相同但热处理方式不同的Nd-Fe-B烧结试样的晶界（GB）相结构进行了表征，并对其演变进行了探讨。650℃退火后采用氮气快速冷却的样品得到了最优的$H_{\ maththrm {cj}}$，样品具有最优的GB分布，晶粒之间存在清晰、相干的薄层GB相。透射电镜（TEM）分析发现，最佳样品的GB区出现了相变高Fe相[非晶（AM）]和高Nd相（共晶）的典型带状结构。非铁磁性高nd GB相的出现有助于实现高矫顽力。在实验Nd- fe - b带状铸造（SC）薄片的GB区观察到“Nd2Fe14B+Nd”共晶。阐明了晶界相结构的复杂性及其成因。认识到Nd-Fe-B合金属于深共晶体系对于系统和完整地理解GB相结构至关重要。

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Grain-Boundary Structures and Evolution in an Nd-Fe-B Sintered Magnet

In the article, the grain-boundary (GB) phase structures of Nd-Fe-B sintered samples with different heat treatments but identical composition were characterized under multiple scales, and the evolution of the GB phase structures was discussed. The optimal

$H_{\mathrm {cj}}$

has been obtained in the sample adopted nitrogen fast cooling after annealing at 650 °C, and the sample had the optimal GB distribution, with clear and coherent thin-layer GB phases existing between the grains. Transmission electron microscopy (TEM) investigation revealed that the phase-separation phenomena occurred, and the typical band-like structure of altering high Fe phase [amorphous (AM)] and high Nd phase (eutectics) formed in the GB region of the optimal sample. The appearance of the nonferromagnetic high-Nd GB phases is helpful to achieve the high coercivity. The eutectic “Nd2Fe14B+Nd” was observed in the GB region of experimental Nd-Fe-B strip-casting (SC) flakes. The complexity and its cause of grain-boundary phase structures were clarified. Recognizing that Nd-Fe-B alloy belongs to a deep eutectic system is crucial for a systematic and integrate understanding of GB phase structures.

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来源期刊

IEEE Transactions on Magnetics 工程技术-工程：电子与电气

CiteScore

4.00

自引率

14.30%

发文量

565

审稿时长

4.1 months

期刊介绍： Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The IEEE Transactions on Magnetics publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.