Texture analysis of ultra-high coercivity Sm2Co7 hot deformation magnets
Qiang Ma(马强)1, 2, 3, Meishuang Jia(贾美爽)2, Zhifeng Hu(胡智峰)2, Ming Yue(岳明)3, Yanli Liu(刘艳丽) 1,2, Tongyun Zhao(赵同云)1, and Baogen Shen(沈保根)1,†
1 State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2 School of Science, Inner Mongolia University of Science and Technology, Baotou 014010, China; 3 College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
Abstract Bulk anisotropic Sm2Co7 nanocrystalline magnets were successfully prepared by hot deformation process using spark plasma sintering technology. The coercivity of the isotropic Sm2Co7 nanocrystalline magnet is 34.76 kOe, further, the ultra-high coercivity of 50.68 kOe is obtained in the anisotropic hot deformed Sm2Co7 magnet when the height reduction is 70%, which is much higher than those of the ordinarily produced hot deformed Sm2Co7 magnet. X-ray diffraction (XRD) analysis shows that all the samples are Sm2Co7 single phase. The investigation by electron backscatter diffraction indicates that increasing the amount of deformation is beneficial to the improvement of the (00l) texture of Sm2Co7 magnets. The Sm2Co7 nanocrystalline magnet generates a strong c-axis crystallographic texture during large deformation process.
Fund: Project supports by the Science Center of the National Natural Science Foundation of China (Grant No. 52088101), the National Natural Foundation of China (Grant No. 51590880), the Fujian Institute of Innovation, Chinese Academy of Sciences (Grant No. FJCXY18040302), the Key Program of the Chinese Academy of Sciences (Grant No. KJZD-EW-M05-1), and the Natural Science Foundation of Inner Mongolia, China (Grant Nos. 2018LH05006 and 2018LH05011).
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