title: Magnetic Properties Improvement of Die-upset Nd-Fe-B Magnets by Dy-Cu Press Injection and Subsequent Heat Treatment.
abstract: Ultrafine-grained die-upset Nd-Fe-B magnets are of importance because they provide a wide researching space to redesign the textured structures. Here is presented a route to obtain a new die-upset magnet with substantially improved magnetic properties. After experiencing the optimized heat treatment, both the coercivity and remanent magnetization of the Dy-Cu press injected magnets increased substantially in comparison with those of the annealed reference magnets, which is distinct from the reported experimental results on heavy rare-earth diffusion. To study the mechanism, we analyzed the texture evolution in high-temperature annealed die-upset magnets, which had significant impact on the improvement of remanent magnetization. On basis of the results, we find that the new structures are strongly interlinked with the initial structures. With injecting Dy-Cu eutectic alloy, an optimized initial microstructure was achieved in the near-surface diffused regions, which made preparations for the subsequent texture improvement. Besides, the Dy gradient distribution of near-surface regions of the Dy-Cu press injected magnets was also investigated. By controlling the initial microstructure and subsequent diffusion process, a higher performance magnet is expected to be obtained.
authors.affiliation: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.|University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Zexuan
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
authors.forename: Jinyun
authors.initials: J
authors.lastname: Ju
authors.affiliation: Ningbo University of Technology, Ningbo 315211, China.
authors.forename: Jinzhi
authors.initials: J
authors.lastname: Wang
authors.affiliation: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.|University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Wenzong
authors.initials: W
authors.lastname: Yin
authors.affiliation: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.|University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Renjie
authors.initials: R
authors.lastname: Chen
authors.affiliation: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.|University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.affiliation: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
authors.forename: Chaoxiang
authors.initials: C
authors.lastname: Jin
authors.affiliation: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.|University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Tang
authors.affiliation: University of Dayton, Dayton, Ohio 45469, USA.
authors.forename: Don
authors.initials: D
authors.lastname: Lee
authors.affiliation: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.|University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Aru
authors.initials: A
authors.lastname: Yan