Effect of optimized aging processing on properties of the sintered Dy-doped Nd-Fe-B permanent magnet

doi:10.1088/1674-1056/24/3/037506

Abstract We investigate the effect of the optimized aging processing on magnetism and mechanical property of the sintered Dy-doped Nd-Fe-B permanent magnet. The experimental results show that the magnetism, especially intrinsic coercivity, of the optimized aged Dy-doped Nd-Fe-B magnet is more excellent than that of the sintered one, but the former's strength and hardness are lower than that of the latter. It was observed that the optimized aged Dy-doped Nd-Fe-B magnet have more uniform grain size, thinner (Nd, Dy)-rich boundary phase. By means of the EBSD technology, the number of larger angle grain boundaries in the optimized aged Dy-doped Nd-Fe-B magnet is more than that of the sintered one. The reasons for the increased intrinsic coercivity and decreased mechanical properties of the optimized aged Dy-doped Nd-Fe-B magnet are also discussed.

Keywords: Dy-doped Nd-Fe-B magnet magnetism strength morphology

Received: 22 September 2014
Revised: 24 October 2014
Accepted manuscript online:

PACS:	75.50.Ww	(Permanent magnets)
	75.50.Vv	(High coercivity materials)
	67.80.dk	(Magnetic properties, phases, and NMR)
	71.20.Eh	(Rare earth metals and alloys)

Fund: Project supported by the Chinese National Major Special Project for the Rare Earth and Rare Metallic Materials (Grant No. (2012) 1743).

Corresponding Authors: Li Mu-Sen
E-mail: msli@sdu.edu.cn

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Wang Xiao-Li (王晓丽), Zhao Li-Na (赵利娜), Ding Kai-Hong (丁开鸿), Cui Sheng-Li (崔胜利), Sun Yong-Cong (孙永聪), Li Mu-Sen (李木森) Effect of optimized aging processing on properties of the sintered Dy-doped Nd-Fe-B permanent magnet 2015 Chin. Phys. B 24 037506

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Effect of optimized aging processing on properties of the sintered Dy-doped Nd-Fe-B permanent magnet

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