Development of Dy-free sintered NdFeB magnet through grain boundary engineering by diffusion of PrCu alloys

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Tang, Wei
Wang, Jing
Dasari, Harika
Kramer, Matthew J.
Cui, Jun
Anderson, Iver
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Ouyang, Gaoyuan
Ames Laboratory Scientist II
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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The Department of Materials Science and Engineering teaches the composition, microstructure, and processing of materials as well as their properties, uses, and performance. These fields of research utilize technologies in metals, ceramics, polymers, composites, and electronic materials.

The Department of Materials Science and Engineering was formed in 1975 from the merger of the Department of Ceramics Engineering and the Department of Metallurgical Engineering.

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Dy-free sintered magnets were fabricated by blending Neo powder with different amount of PrCu powder. With increasing PrCu from 0-10 wt.%, Hcj of the magnets gradually increases from the original 14.5 kOe to 18.6 kOe. The highest (BH)max achieved was 35.0 MGOe with 7.5 wt.% PrCu. It was found that PrCu was mainly distributed at grain boundary and triple junctions, leading to a reduced coupling among grains, thus an enhanced Hcj. The grain boundary engineering by the diffusion of PrCu alloy is an effective method to improve Hcj of Dy-free magnets.
This is a manuscript of a conference proceeding published as Tang, Wei, Gaoyuan Ouyang, Jing Wang, Harika Dasari, Matthew J. Kramer, Jun Cui, and Iver E. Anderson. "Development of Dy-free sintered NdFeB magnet through grain boundary engineering by diffusion of PrCu alloys." Intermag 2023. Sendai, Japan, May 15-19, 2023. Copyright 2023 IEEE. Posted with permission.
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