Effect of Heat Treatment Time on Dy–Cu Alloy Diffusion Process in Dy-Containing Commercial Nd–Fe–B Sintered Magnets |
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摘 要: | In this paper, the grain boundary diffusion process(GBDP) using a Dy_(70)Cu_(30)(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)_2Fe_(14)B 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 Nd_2Fe_(14)B grains was revealed, and a nearly homogeneous(Nd,Dy)_2Fe_(14)B 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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收稿时间: | 2017-03-01 |
Effect of Heat Treatment Time on Dy-Cu Alloy Diffusion Process in Dy-Containing Commercial Nd-Fe-B Sintered Magnets |
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Authors: | HYLiu GWang YHong DCZeng |
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Affiliation: | 1.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China |
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Abstract: | 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 °C, 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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Keywords: | Sintered Nd-Fe-B magnets Grain boundary diffusion Heat treatment time Coercivity Micromagnetic simulation |
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