Enhancing the coercivity of Nd-Cu-diffused Nd-Fe-B permanent magnets by Nb-assisted grain boundary pinning

M. B. Siva Kumar; D. Prabhu; M. Sadhasivam; B. Manjusha; N. Chandrasekaran; K. G. Pradeep; G. Sundararajan; R. Gopalan

doi:10.1080/21663831.2022.2104139

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Enhancing the coercivity of Nd-Cu-diffused Nd-Fe-B permanent magnets by Nb-assisted grain boundary pinning

Original Reports | 更新时间：2026-08-19

- Enhancing the coercivity of Nd-Cu-diffused Nd-Fe-B permanent magnets by Nb-assisted grain boundary pinning
- Enhancing the coercivity of Nd-Cu-diffused Nd-Fe-B permanent magnets by Nb-assisted grain boundary pinning
- 材料研究快报（英文） 2022年10卷第12期页码：780-787
- 作者机构：
  
  1. a Centre for Automotive Energy Materials International Advanced Research Centre for Powder Metallurgy and New Materials IIT Madras Research Park Chennai Tamil Nadu India
  2. a Centre for Automotive Energy Materials International Advanced Research Centre for Powder Metallurgy and New Materials IIT Madras Research Park Chennai
  3. b Correlative Microscopy Laboratory Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai
  4. b Correlative Microscopy Laboratory Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai Tamil Nadu India
  5. c National Facility for Atom Probe Tomography Indian Institute of Technology Madras Chennai
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2022.2104139
  中图分类号：
- 网络首发：2022-07-30，
  
  纸质出版：2022
- 稿件说明：
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M. B. Siva Kumar, D. Prabhu, M. Sadhasivam, 等. Enhancing the coercivity of Nd-Cu-diffused Nd-Fe-B permanent magnets by Nb-assisted grain boundary pinning[J]. 材料研究快报（英文）, 2022,10(12):780-787.

M. B. Siva Kumar, D. Prabhu, M. Sadhasivam, et al. Enhancing the coercivity of Nd-Cu-diffused Nd-Fe-B permanent magnets by Nb-assisted grain boundary pinning[J]. Materials Research Letters, 2022, 10(12): 780-787.
M. B. Siva Kumar, D. Prabhu, M. Sadhasivam, 等. Enhancing the coercivity of Nd-Cu-diffused Nd-Fe-B permanent magnets by Nb-assisted grain boundary pinning[J]. 材料研究快报（英文）, 2022,10(12):780-787. DOI： 10.1080/21663831.2022.2104139.

M. B. Siva Kumar, D. Prabhu, M. Sadhasivam, et al. Enhancing the coercivity of Nd-Cu-diffused Nd-Fe-B permanent magnets by Nb-assisted grain boundary pinning[J]. Materials Research Letters, 2022, 10(12): 780-787. DOI： 10.1080/21663831.2022.2104139.

摘要

Abstract

We report the effect of grain boundary diffusion of the Nd-Cu eutectic phase and the influence of Nb on the microstructure and magnetic properties of Nd-Fe-B melt-spun ribbons. The Atom probe tomography analysis indicated the presence of Nb clusters (∼10 nm)

which possibly restricts grain growth during diffusion annealing while facilitating Nd-Cu grain boundary decoration. Correspondingly

the coercivity was enhanced from the initial 1.2 T of the as-prepared to 2.1 T for the 20 wt.% Nd-Cu diffusion annealed (600°C

2 h). Incidentally

the as-diffused sample exhibited a high coercivity of ∼1 T at 150°C

making it suitable for high-temperature applications.

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