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Coercivity enhancement in Dy-free sintered Nd-Fe-B magnets by effective structure optimization of grain boundaries
Ding, Guangfei; Guo, Shuai; Chen, Ling; Di, Jinghui; Song, Jie; Chen, Renjie; Lee, Don; Yan, Aru
2018
发表期刊JOURNAL OF ALLOYS AND COMPOUNDS
卷号735页码:795-801
摘要In this study, we presented an effective approach for the substantial coercivity enhancement of Dy-free sintered Nd-Fe-B magnets with Ga-doping. The coercivity was substantially enhanced from 10.1 kOe to 19.8 kOe by effective microstructure optimization and phase constitution regulation in antecedent alloys. A good isolation of 2:14:1 grains by Nd-rich intergranular phase is obtained in final magnets accompanying with the formation of intermetallic Nd6Fe13Ga phase. However, when dehydrogenating above 500 degrees C, masses of preformed Nd6Fe13Ga phases are detected in the initial strip casting alloys and the homologous magnet suffers an unanticipated degradation of coercivity. Magnetic domain observation and thermal magnetic analysis imply a pronounced difference in the magnetism of grain boundary (GB) phases, which closely associated with the composition homogeneity of Nd-rich phases in antecedent alloys. The mechanism of the coercivity variation in the sintered magnets with different GBs magnetism is discussed based on magnetic behavior analysis. (C) 2017 Elsevier B.V. All rights reserved.
关键词Permanent-magnets Size Dependence Microstructure Phase Diffusion Decrease Alloy Force
学科领域Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics
语种英语
文献类型期刊论文
条目标识符http://ir.nimte.ac.cn/handle/174433/16798
专题2018专题
推荐引用方式
GB/T 7714
Ding, Guangfei,Guo, Shuai,Chen, Ling,et al. Coercivity enhancement in Dy-free sintered Nd-Fe-B magnets by effective structure optimization of grain boundaries[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,735:795-801.
APA Ding, Guangfei.,Guo, Shuai.,Chen, Ling.,Di, Jinghui.,Song, Jie.,...&Yan, Aru.(2018).Coercivity enhancement in Dy-free sintered Nd-Fe-B magnets by effective structure optimization of grain boundaries.JOURNAL OF ALLOYS AND COMPOUNDS,735,795-801.
MLA Ding, Guangfei,et al."Coercivity enhancement in Dy-free sintered Nd-Fe-B magnets by effective structure optimization of grain boundaries".JOURNAL OF ALLOYS AND COMPOUNDS 735(2018):795-801.
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