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王东鑫,乔印凯,刘东,华刚,王海滨,刘雪梅,宋晓艳.Hf、CNTs混合掺杂对纳米晶Sm5Co19合金结构和磁性能的影响[J].稀有金属材料与工程(英文),2018,47(3):1001~1006.[wangdongxin,qiaoyinkai,liudong,huagang,wanghaibin,liuxuemei and songxiaoyan.Effect of Alloy Structure and the Magnetic Mix Doping Hf Elements and CNTs on Nanocrystalline Sm5Co19 Alloy[J].Rare Metal Materials and Engineering,2018,47(3):1001~1006.]
Effect of Alloy Structure and the Magnetic Mix Doping Hf Elements and CNTs on Nanocrystalline Sm5Co19 Alloy
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Received:January 13, 2016  Revised:February 03, 2016
Key words: nanocrystalline  element doping  crystal structure  atom occupancy  intrinsic coercivity
Foundation item:国家自然科学基金资助(项目号51371012, 51425101)
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wangdongxin,qiaoyinkai,liudong,huagang,wanghaibin,liuxuemei and songxiaoyan  
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      In this study, permanent magnetic nanocrystalline Sm5Co19Hf0.4 alloy and Sm5Co19Hf0. 4CNTs0. 4 alloy with high room-temperature coercivity were produced. The microstructure, crystal structure and magnetic were studied. The results show that the Hf elements and CNTs mixed added did not lead to phase decomposition of Ce5Co19 type structure, meanwhile the microstructure possess fine grain size and uniform distribution. Energy Dispersive X-ray Spectrometry (EDX) analysis confirmed that CNTs move into grain boundaries of the nanocrystalline Sm5Co19Hf0.4CNTs0.4alloy, which can improve the coercivity of the nanocrystalline Sm5Co19 alloy for the grain boundary pinning effect. Rietyeld refinement showed that Hf comes into the Sm vacancy decreasing the lattice parameters and increasing the axial ratio c/a , which furtherly enhance the magnetocrystalline anisotropy , thus strengthen the coercivity of nanocrystalline alloy. In this paper, the results of the study can promote the design of Sm-Co alloy with high magnetocrystalline anisotropy and intrinsic coercivity.