Low cost and high abundance rare earth elements Y and Ce have attracted tremendous interests of the in-dustrial and scientific societies for fabricating the highly cost-performance efficient rare earth permanent magnets. However, the effect of separate replacement of Nd by Y or Ce on the performances of NdFeB-type magnet under the same atomic ratio and preparation conditions is still unclear. In this work, we systemati-cally investigated the magnetic properties, thermal stabilities and service performances of (Nd0.8Y0.2)13.80 FebalAl0.24Cu0.1B6.04 (atomic fraction, denoted as 20Y) and (Nd0.8Ce0.2)13.80FebalAl0.24Cu0.1B6.04 (atomic fraction, denoted as 20Ce) magnets. The results demonstrate that theμ0Mr,μ0Hc and (BH)max of 20Y magnet are respectively 1.325 T, 1.173 T and 343.467 kJ/m3, which are comprehensively higher than those of 20Ce magnet (μ0Mr=1.310 T,μ0Hc=0.948 T, (BH)max=321.105 kJ/m3). Moreover, the 20Y magnet has higher thermal stability compared with 20Ce magnet which is favorable for the magnetic performances at elevated temperatures. The investigation of microstructure and elemental distribution indicates that the excellent magnetic performances of NdY-Fe-B magnet can be attributed not only to the preferable intrinsic properties 4πMs, Ha and Tc of Y2Fe14B, but also to the in-situ core-shell structure of the 2:14:1 matrix phase grain with Y-rich core and Nd-rich shell, along with the thicker grain boundary layer between the adjacent matrix phase grains in NdY-Fe-B magnet. Furthermore, the 20Y magnet exhibits better mechanical property and higher corrosion resistance than 20Ce magnet, which are helpful for prolonging the service life of the magnet in practical application.

Xiaodong Fan;Shuai Guo;Guangfei Ding;Sining Fan;Zhehuan Jin;Renjie Chen;Shukai Zhang;Aru Yan

CAS Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Chinalco Shandong Yinuowei Strong Magnetic Material Co.,Ltd.,Taian 271600,China

稀土学报（英文版）

[1]Xiaodong Fan;Shuai Guo;Guangfei Ding;Sining Fan;Zhehuan Jin;Renjie Chen;Shukai Zhang;Aru Yan-.A comparative study of NdY-Fe-B magnet and NdCe-Fe-B magnet)[J].稀土学报（英文版）,2022(09):1480-1487

NdY,NdCe,FebalAl0,24Cu0,1B6,20Y,80FebalAl0,20Ce,0Mr,0Hc,Y2Fe14B

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