Tailoring the mechanical anisotropy of sintered NdFeB magnets by Pr-Cu grain boundary reconstruction
来源期刊：JOURNAL OF RARE EARTHS2019年第4期
论文作者：Minghui Tang Xiaoqian Bao Xuejiao Zhang Xing Mu Kechao Lu Jiheng Li Xuexu Gao
文章页码：393 - 397
摘 要：Pr83Cu17（wt%） grain boundary reconstruction was applied to prepare sintered NdFeB magnets. The effects of addition amount and annealing on the bending strength were investigated. The results show that Pr83Cu17 can not only effectively enhance the bending strength, but also change the mechanical anisotropy in two directions parallel and perpendicular to c-axis. The bending strength perpendicular to c-axis reaches 404 MPa in 10 wt% addition magnet, higher than 348 MPa along parallel direction. This change is attributed to the preferred distribution of boundary phases, i.e., ductile（Nd,Pr）-Fe-Cu phase along perpendicular direction to c-axis and（Nd,Pr）-Fe phase along parallel direction. Moreover, the Cu migration during 480 ℃ annealing is found to be related to this boundary phase distribution.
Minghui Tang1，Xiaoqian Bao1，Xuejiao Zhang1，Xing Mu2，Kechao Lu1，Jiheng Li1，Xuexu Gao1
1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing2. School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing
摘 要：Pr83Cu17（wt%） grain boundary reconstruction was applied to prepare sintered NdFeB magnets. The effects of addition amount and annealing on the bending strength were investigated. The results show that Pr83Cu17 can not only effectively enhance the bending strength, but also change the mechanical anisotropy in two directions parallel and perpendicular to c-axis. The bending strength perpendicular to c-axis reaches 404 MPa in 10 wt% addition magnet, higher than 348 MPa along parallel direction. This change is attributed to the preferred distribution of boundary phases, i.e., ductile（Nd,Pr）-Fe-Cu phase along perpendicular direction to c-axis and（Nd,Pr）-Fe phase along parallel direction. Moreover, the Cu migration during 480 ℃ annealing is found to be related to this boundary phase distribution.
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