TbCu7型SmCo7-xHfx合金的结构及磁性能  

Structure and magnetic properties of TbCu7-type SmCo7-xHfx alloys

作　　者：谢伟诚 陶力 钟明龙[1] 刘仁辉[1] 倪刚 胡贤君 钟震晨[1] XIE Weicheng;TAO Li;ZHONG Minglong;LIU Renhui;NI Gang;HU Xianjun;ZHONG Zhenchen(Jiangxi Province Key Laboratory for Rare Earth Magnetic Materials and Devices,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学江西省稀土磁性材料及器件重点实验室

出　　处：《有色金属科学与工程》2019年第5期101-105,共5页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金资助项目(51661011)

摘　　要：采用熔体快淬法在40 m/s制备了SmCo7-xHfx(x=0,0.1,0.15,0.2,0.3)合金薄带,研究Hf取代量对SmCo7-xHfx合金的相组成、组织结构及磁性能的影响.结果表明:随Hf取代量的增加,均可获得TbCu7型结构的亚稳相,晶格常数a和c也随之增加,c/a比值在0.82~0.83,晶粒平均尺寸减小,且更加均匀;在性能方面,Hf取代量为0.2时,可获得最优磁性能Br为0.55 T和Hc为1 084 kA/m.Hf的添加还可有效改善合金高温性能,在27~400°C温度区间,矫顽力温度系数由未添加时-0.21%/°C改善到-0.18%/°C,提升14.3%.SmCo7-xHfx(x=0,0.1,0.15,0.2,0.3)alloy ribbons were prepared by melt-spun at 40 m/s.The phase composition,microstructure and magnetic properties of SmCo7-xHfx alloys were investigated.The results show that,the metastable phase of TbCu7 structure can be obtained with the increasing of Hf substitution,as well as the lattice constants a and c.The c/a ratio is 0.82~0.83,and the grains become finer and uniform.The optimum magnetic properties(Br=0.55 T and Hc=1 084 kA/m)were obtained with x=0.2 Hf substitution.The Hf substitution could also improve the alloy high temperature performance observably.The coercivity temperature coefficient is improved from-0.21%/°C to-0.18%/°C,with a growing range around 14.3%,at the temperature range of 27~400°C.

关 键 词：SmCo7合金 Hf取代 组织结构 磁性能 

分 类 号：TM271.3[一般工业技术—材料科学与工程] TF125.8[电气工程—电工理论与新技术]