Grain boundary restructuring and La/Ce/Y application in Nd-Fe-B magnets

doi:10.1088/1674-1056/28/7/077507

Abstract Since the 1980s,Nd-Fe-B with largest energy product (BH)_max approaching the theoretical limit has become the landmark of permanent magnetic material.The application spectrum for Nd-Fe-B continues to expand over time both in the industrial and commercial sectors,which leads to growing research interests for solving the long-standing drawbacks of Nd-Fe-B,i.e.,poor corrosion resistance,low coercivity,high Dy/Tb and low La/Ce/Y consumption.Concerning the above obstacles,we aim to present the novel grain boundary restructuring (GBR) approach,from GB design,processing,to structure evolution and property evaluation with a focus on the corrosion and coercivity mechanism of the restructured 2:14:1-typed magnets.Starting with an introduction to the fundamental of GBR,two representative examples,high-electrode-potential (Pr,Nd)_32.5Fe_62.0Cu_5.5 and low-melting-point Dy_71.5Fe_28.5,are given with detailed descriptions of the advantages of GBR to enhance the intrinsic anti-corrosion stability and to strengthen the coercivity at low Dy consumption.Microstructure-property correlations are established to understand the critical importance of regulating the restructured GB phase to maximize the all-round performance of the 2:14:1-typed permanent magnets.Aiming at sustainable and balanced development of rare earth (RE) industry,the proceeding section proposes new prototypes of La-Ce and Y-Ce co-substitutions with dual benefits of stabilizing the 2:14:1 tetragonal phase and strengthening the intrinsic hard magnetism.The findings of additional REFe₂ intergranular phase delight that the GBR approach also opens up a new horizon of research and application to develop high-performance La/Ce/Y-rich permanent magnets with deliberately tailored GB phase.

Keywords: grain boundary restructuring coercivity corrosion resistance Dy/Tb La/Ce/Y

Received: 10 June 2019
Accepted manuscript online:

PACS:

75.50.Ww

(Permanent magnets)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51801181, 51571176, 51590881, and 51622104), the National Key Research and Development Program of China (Grant No. 2016YFB0700902), the Key Research and Development Program of Zhejiang Province, China (Grant No. 2017C01031), and the Fundamental Research Funds for the Central Universities, China (Grant No. 2019QNA4011).

Corresponding Authors: Mi Yan
E-mail: mse_yanmi@zju.edu.cn

Cite this article:

Mi Yan(严密), Jiaying Jin(金佳莹), Tianyu Ma(马天宇) Grain boundary restructuring and La/Ce/Y application in Nd-Fe-B magnets 2019 Chin. Phys. B 28 077507

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