【摘 要】
：
In this paper,the grain boundary diffusion process (GBDP) using a Dy70Cu30 (at.％) alloy as the diffusion source was performed in a commercial sintered Nd-Fe-B magnet,and the effect of heat treatment time on the microstructure and magnetic properties of th
【机 构】
：
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640,
论文部分内容阅读
In this paper,the grain boundary diffusion process (GBDP) using a Dy70Cu30 (at.％) alloy as the diffusion source was performed in a commercial sintered Nd-Fe-B magnet,and the effect of heat treatment time on the microstructure and magnetic properties of the magnet was investigated in detail.For the processed magnets heat-treated at 860 ℃,as heat treatment time increased,the coercivity and the depth of (Nd,Dy)2Fe14B core-shell structure increased first and then decreased.However,when the heat treatment time was more than 2 h,the diffusion path of Dy from the Dy-rich shell phase into the Nd2Fe14B grains was revealed,and a nearly homogeneous (Nd,Dy)2Fe14B phase was formed,which brought on the decrease in both the depth of visible core-shell structure and the coercivity of Nd-Fe-B magnet.
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