The effect of Nd-Cu diffusion during hot pressing and hot deformation on the coercivity and the deformation ability of Nd-Fe-B HDDR magnets

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:438

Article

Wang, Haihang^1,2  Chen, Renjie^2,3  Yin, Wenzong²  Zhu, Mingyuan¹  Tang, Xu²  Wang, Zexuan^2,3  Jin, Chaoxiang²  Ju, Jinyun²  Lee, Don²  Yan, Aru² 

[1] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200072, Peoples R China

[2] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, CAS Key Lab Magnet Mat & Devices, Ningbo 315201, Zhejiang, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

关键词: HDDR;    Diffusion;    Coercivity;    Deformation ability;   

DOI  :  10.1016/j.jmmm.2017.04.031

来源: Elsevier

【 摘 要 】

HDDR processed Nd-Fe-B powders blended with Nd-Cu powders were hot-pressed and then hot-deformed to obtain fully dense, anisotropic magnets. The microstructure evolution in hot-pressed and hot-deformed HDDR magnets was studied to illustrate the impact of Nd-Cu diffusion on coercivity and deformation ability. It was found that the coercivity and the deformation ability were improved significantly by Nd-Cu addition. The coercivity of hot-deformed magnets was increased from 3.81 kOe to 13.01 kOe after 2 wt% Nd-Cu additions and the annealing at 900 degrees C for 2 h. Scanning electron microscopy and transmission electron microscopy observations revealed that the variation in coercivity was attributed to the diffusion of Nd-Cu along the grain boundaries during hot pressing and hot deformation. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free