Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 666, Issue -, Pages 432-439Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.12.227
Keywords
Permanent magnets; Nd-Fe-B; Coercivity; Diffusion process; Grain boundary phase
Categories
Funding
- JST, CREST
- future pioneering program Development of magnetic material technology for high-efficiency motors
Ask authors/readers for more resources
Nd-M (M = Al, Cu, Ga, Zn, Mn) alloys with compositions close to eutectic points were investigated as diffusion sources for the grain boundary diffusion process to hot-deformed Nd-Fe-B magnets. Coercivity enhancement was observed for most of the alloys. Among them, the sample processed with Nd90Al10 exhibited the highest coercivity of 2.5 T at room temperature. However, the sample processed with Nd70Cu30 exhibited the highest coercivity of 0.7 T at 200 degrees C. Microstructural observations using scanning transmission electron microscope (STEM) showed that nonferromagnetic Nd-rich intergranular phase envelops the Nd2Fe14B grains after the diffusion process. Abnormal grain growth and the dissolution of Al into the Nd2Fe14B grains were observed in the sample processed with Nd90Al10, which explains its inferior thermal stability of coercivity compared to the sample processed with Nd70Cu30. The coercivity enhancement and poor thermal stability of the coercivity of the Nd90Al10 diffusion-processed sample are discussed based on microstructure studies by transmission electron microscopy. (C) 2016 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available