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Chin. Phys. B, 2019, Vol. 28(7): 077507    DOI: 10.1088/1674-1056/28/7/077507
Special Issue: TOPICAL REVIEW — Magnetism, magnetic materials, and interdisciplinary research
TOPICAL REVIEW—Magnetism, magnetic materials, and interdisciplinary research Prev   Next  

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

Mi Yan(严密), Jiaying Jin(金佳莹), Tianyu Ma(马天宇)
School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
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)32.5Fe62.0Cu5.5 and low-melting-point Dy71.5Fe28.5,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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