Microstructure of core-shell NdY-Fe-B sintered magnets with a high coercivity and excellent thermal stability

doi:10.1016/j.actamat.2020.05.038

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	Microstructure of core-shell NdY-Fe-B sintered magnets with a high coercivity and excellent thermal stability
	Ding, Guangfei; Liao, Shicong; Di, Jinghui; Zheng, Bo; Guo, Shuai; Chen, Renjie; Yan, Aru
刊名	ACTA MATERIALIA
	2020
卷号	194 页码:547-557
关键词	GRAIN-SIZE PERMANENT-MAGNETS ENHANCEMENT DEPENDENCE ANISOTROPY MAGNETIZATION FIELDS LA CE
DOI	10.1016/j.actamat.2020.05.038
英文摘要	We developed the NdY-Fe-B sintered magnet by effective microstructure modification, which exhibits an excellent thermal stability of coercivity with 15 at.% Nd substituted by Y. The feature of microstructure and its inherent link with the magnetic configurations were comprehensively investigated by experimental and micromagnetic simulation approaches. Microstructure analysis confirmed that the novel inhomogeneous distribution of Y in the core and shell regions of the grains was obtained in the whole magnets, contributing to the magnetic hardening of the grain surface areas. TEM observation indicates the tendency of Y depletion in grain boundary (GB) phases, which permits the significantly formation of Nd6Fe13(Ga,Cu)(1) phase in the post-annealing magnet, accompanying with the optimization of intergranular GB phase distribution. The thick and Nd-riched intergranular GB phases play a significant role in magnetic isolating the adjacent grains and thus gives rise to a remarkable coercivity increase from 1.16 to 1.72 T. In addition, since the weakened temperature dependence of the magnetocrystalline anisotropy field, the substitution of Nd by Y effectively relieves the deterioration of the coercivity with temperature increasing. Relying on the combined effect of Y substitution on microstructure and intrinsic properties, a low absolute value (0.548%/degrees C) of the temperature coefficient (20-120 degrees C) of the coercivity is achieved. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
学科主题	Materials Science ; Metallurgy & Metallurgical Engineering
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/20617]
专题	2020专题
作者单位	Yan, A (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Key Lab Magnet Mat & Devices, Ningbo 315201, Peoples R China.
推荐引用方式 GB/T 7714	Ding, Guangfei,Liao, Shicong,Di, Jinghui,et al. Microstructure of core-shell NdY-Fe-B sintered magnets with a high coercivity and excellent thermal stability[J]. ACTA MATERIALIA,2020,194:547-557.
APA	Ding, Guangfei.,Liao, Shicong.,Di, Jinghui.,Zheng, Bo.,Guo, Shuai.,...&Yan, Aru.(2020).Microstructure of core-shell NdY-Fe-B sintered magnets with a high coercivity and excellent thermal stability.ACTA MATERIALIA,194,547-557.
MLA	Ding, Guangfei,et al."Microstructure of core-shell NdY-Fe-B sintered magnets with a high coercivity and excellent thermal stability".ACTA MATERIALIA 194(2020):547-557.