Coercivity and thermal stability enhancement of NdFeB magnet by grain boundary diffusion Tb80Al20 alloys. (November 2021)

• Record Type: Journal Article
• Authors: Zhou, Toujun; Guo, Yi; Xie, Guoqiang; Rehman, Sajjad Ur; Liu, Renhui; Liu, Junrui; Qu, Pengpeng; Li, Mianfu
• Is Part Of: Intermetallics. Volume 138(2021)
• Publication Date: 2021-11
• Subjects: Sintered NdFeB magnets -- Grain boundary diffusion -- Coercivity -- Thermal stability -- Microstructural evolution; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2021.107335
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: Grain boundary diffusion of Tb and Al elements can improve the coercivity and optimize grain boundary of NdFeB magnets. In this paper, we investigated magnetic property and microstructure evolution of sintered NdFeB magnets by grain boundary diffusion Tb80 Al20 alloys. The coercivity and thermal stability of the magnets were effectively improved. Microstructural analysis confirmed the formation of Tb-rich shells and continuous grain boundary, contributing to coercivity enhancement of magnet. The element distribution and diffusion mechanism of the magnets have been disused. This work may shed light on developing low heavy rare earth sintered NdFeB magnets. Highlights: This study provides a method to improve the utilization of heavy rare earths elements in sintered Nd-Fe-B magnets. This work, the Tb80 Al20 alloys as diffusion source is the first time used in sintered Nd-Fe-B magnets. The formation of Al elements is beneficial to promote the distribution of the Tb-rich shell.