Grain boundary diffusion mechanism in Dy-diffused Nd–Fe–B sintered magnets

doi:10.1088/1361-6463/ad3bc6

IMR OpenIR

	Grain boundary diffusion mechanism in Dy-diffused Nd–Fe–B sintered magnets
	Dai,Zhiming 1,2; Li,Kai 1,3; Wang,Zhenhua 1; Wang,Tingting 2; Liu,Wei 1; Zhang,Zhidong 1
通讯作者	Wang,Zhenhua()
	2024-05-07
发表期刊	Journal of Physics D: Applied Physics
ISSN	0022-3727
卷号	57 期号:30
摘要	Abstract Grain boundary diffusion (GBD) is an effective method to enhance the thermal stability of Nd–Fe–B based permanent magnets. When developing a high-performance magnet, it is essential to carry out a study on its mechanisms, in order to reveal the distribution regulation of diffusion solutes and microstructural evolution. In the present work, the phase-field method is applied to investigate the thermodynamic features and the heavy rare-earth Dy migration in a Dy-diffused Nd–Fe–B magnet during the GBD process. In the simulation process, the grain phase transformation and volume diffusion were taken into consideration and the effects of the diffusion mode, initial diffusion source concentration, grain size, and grain boundary (GB) width were explored in a set of magnet models with various grain sizes. An optimized fitting function was introduced to evaluate the solute distribution in grain boundaries and the effective diffusion coefficient. It is shown that the diffusion mode and the GB width have significant impacts on the effective diffusion coefficient. The results provide a theoretical scheme concerning the quantitative evaluation of GBD efficiency based on thermodynamic analysis.
关键词	grain boundary diffusion permanent magnet phase field simulation heavy rare earth microstructure evolution
DOI	10.1088/1361-6463/ad3bc6
语种	英语
WOS记录号	IOP:d_57_30_305004
出版者	IOP Publishing
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/179836
专题	中国科学院金属研究所
通讯作者	Wang,Zhenhua
作者单位	1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China 2.Jiangsu Key Laboratory of Modern Measurement Technology and Intelligent Systems, Department of Physics, Huaiyin Normal University, Huai’an 223300, People’s Republic of China 3.School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, People’s Republic of China
推荐引用方式 GB/T 7714	Dai,Zhiming,Li,Kai,Wang,Zhenhua,等. Grain boundary diffusion mechanism in Dy-diffused Nd–Fe–B sintered magnets[J]. Journal of Physics D: Applied Physics,2024,57(30).
APA	Dai,Zhiming,Li,Kai,Wang,Zhenhua,Wang,Tingting,Liu,Wei,&Zhang,Zhidong.(2024).Grain boundary diffusion mechanism in Dy-diffused Nd–Fe–B sintered magnets.Journal of Physics D: Applied Physics,57(30).
MLA	Dai,Zhiming,et al."Grain boundary diffusion mechanism in Dy-diffused Nd–Fe–B sintered magnets".Journal of Physics D: Applied Physics 57.30(2024).