中国物理B ›› 2019, Vol. 28 ›› Issue (7): 77507-077507.doi: 10.1088/1674-1056/28/7/077507
所属专题: TOPICAL REVIEW — Magnetism, magnetic materials, and interdisciplinary research
• TOPICAL REVIEW—Magnetism, magnetic materials, and interdisciplinary research • 上一篇 下一篇
Mi Yan(严密), Jiaying Jin(金佳莹), Tianyu Ma(马天宇)
收稿日期:
2019-06-10
出版日期:
2019-07-05
发布日期:
2019-07-05
通讯作者:
Mi Yan
E-mail:mse_yanmi@zju.edu.cn
基金资助:
Mi Yan(严密), Jiaying Jin(金佳莹), Tianyu Ma(马天宇)
Received:
2019-06-10
Online:
2019-07-05
Published:
2019-07-05
Contact:
Mi Yan
E-mail:mse_yanmi@zju.edu.cn
Supported by:
摘要: 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.
中图分类号: (Permanent magnets)
严密, 金佳莹, 马天宇. Grain boundary restructuring and La/Ce/Y application in Nd-Fe-B magnets[J]. 中国物理B, 2019, 28(7): 77507-077507.
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[J]. Chin. Phys. B, 2019, 28(7): 77507-077507.
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