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Relation between microstructure and magnetic properties of shock wave-compressed Nd–Fe–B magnets

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Abstract

The relationship between the microstructure and magnetic properties of Nd–Fe–B sintered magnet compressed by shock wave with 6.26 GPa ≤ p ≤ 7.16 GPa was investigated. It reveals that Nd–Fe–B magnets show a demagnetization behavior after compressed by shock wave. The intergranular fracture is the main occurring phenomenon in the shock wave-compressed magnets. The coercivity of the shock wave-compressed Nd–Fe–B magnets could be recovered after repeating the annealing process. It suggests that only the morphology change just like the intergranular fracture occurs, and there is no structural change in the grain boundary phase in the shock wave-compressed magnet. Matrix phase grain interconnection, microcracks and pores, and alterant orientation relationship between matrix phase and grain boundaries phase are considered as induced factors of demagnetization.

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Acknowledgments

This study was financially supported by the National High Technology Research and Development Program of China (No. 2011AA03A401), the National Basic Research Program of China (No. 2014CB643701), the National Natural Science Foundation of China (Nos. 51171049 and 51271060), and the National Key Technology R&D Program (No. 2012BAE02B01).

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Authors and Affiliations

  1. Division of Functional Materials, Central Iron and Steel Research Institute, Beijing, 100081, China

    Ming-Gang Zhu, Yan-Feng Li, Wei Li, Li-Yun Zheng, Dong Zhou & Hai-Bo Feng

  2. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China

    Lang Chen

  3. College of Science, Northeastern University, Shenyang, 110819, China

    An Du

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  1. Ming-Gang Zhu
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  2. Yan-Feng Li
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  5. Dong Zhou
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  7. Lang Chen
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Correspondence to Ming-Gang Zhu.

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Zhu, MG., Li, YF., Li, W. et al. Relation between microstructure and magnetic properties of shock wave-compressed Nd–Fe–B magnets. Rare Met. 41, 2353–2356 (2022). https://doi.org/10.1007/s12598-015-0587-1

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  • DOI: https://doi.org/10.1007/s12598-015-0587-1

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