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Volume 6
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Article

The Influence of Alignment Degree on the Shrinkage Behavior of Sintered Nd-Fe-B Magnets

by
Yunfei Sun
1,
Jincheng Zeng
2,3,
Yongfang Deng
1,4,*,
Weitao Ning
5,
Zihang Li
1,
Weiyi Xia
1,
Yirong Cai
1 and
Qingchang Wu
6
1
School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2
School of Electrical Engineering and Automation, Jiangxi University of Science and Technology, Ganzhou 341000, China
3
Jiangxi Provincial Key Laboratory of Maglev Technology, Ganzhou 341000, China
4
National Rare Earth Functional Materials Innovation Center, Ganzhou 341000, China
5
School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
6
Jiangxi Yueci Rare Earth New Material Technology Co., Ltd., Ganzhou 341000, China
*
Author to whom correspondence should be addressed.
Magnetism 2026, 6(1), 12; https://doi.org/10.3390/magnetism6010012
Submission received: 17 December 2025 / Revised: 26 January 2026 / Accepted: 2 February 2026 / Published: 11 March 2026
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Abstract

In this study, Nd-Fe-B magnets with different degrees of alignment were prepared by adjusting the strength of the alignment magnetic field. The mechanism of influence of alignment degree on the densification of magnets was systematically investigated. The shrinkage rates of the magnets after sintering were calculated, and the results showed that the unoriented magnets exhibited similar shrinkage in different directions, displaying isotropic shrinkage behavior. With the increase in the degree of alignment, the magnets showed significant differences in shrinkage across different directions, presenting anisotropic shrinkage characteristics. In addition, the microstructural analysis revealed that the alignment degree also exerted a certain influence on the micromorphology of the magnets. The grain size parallel to the c-axis was larger than that parallel to the a-axis, which indicates that the alignment degree plays a crucial role in the anisotropic densification of the Nd-Fe-B magnets.
Keywords: sintered Nd-Fe-B magnet; degree of alignment; aligned magnetic field; anisotropic densification; microstructure sintered Nd-Fe-B magnet; degree of alignment; aligned magnetic field; anisotropic densification; microstructure

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MDPI and ACS Style

Sun, Y.; Zeng, J.; Deng, Y.; Ning, W.; Li, Z.; Xia, W.; Cai, Y.; Wu, Q. The Influence of Alignment Degree on the Shrinkage Behavior of Sintered Nd-Fe-B Magnets. Magnetism 2026, 6, 12. https://doi.org/10.3390/magnetism6010012

AMA Style

Sun Y, Zeng J, Deng Y, Ning W, Li Z, Xia W, Cai Y, Wu Q. The Influence of Alignment Degree on the Shrinkage Behavior of Sintered Nd-Fe-B Magnets. Magnetism. 2026; 6(1):12. https://doi.org/10.3390/magnetism6010012

Chicago/Turabian Style

Sun, Yunfei, Jincheng Zeng, Yongfang Deng, Weitao Ning, Zihang Li, Weiyi Xia, Yirong Cai, and Qingchang Wu. 2026. "The Influence of Alignment Degree on the Shrinkage Behavior of Sintered Nd-Fe-B Magnets" Magnetism 6, no. 1: 12. https://doi.org/10.3390/magnetism6010012

APA Style

Sun, Y., Zeng, J., Deng, Y., Ning, W., Li, Z., Xia, W., Cai, Y., & Wu, Q. (2026). The Influence of Alignment Degree on the Shrinkage Behavior of Sintered Nd-Fe-B Magnets. Magnetism, 6(1), 12. https://doi.org/10.3390/magnetism6010012

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