Coercivity mechanism of high-performance anisotropic heterostructure SmCo_(5)magnets  

作　　者：Yuan Teng Yuqing Li Weiqiang Liu Xiaochang Xu Zhanjia Wang Jianjun Yang Dongtao Zhang Hongguo Zhang Qingmei Lu Qiong Wu Weixing Xia Ming Yue 

机构地区：[1]Faculty of Materials and Manufacturing,Key Laboratory of Advanced Functional Materials,Ministry of Education of China,Beijing University of Technology,Beijing,100124,China [2]School of Mechanical and Electrical Engineering,Henan Institute of Science and Technology,Xinxiang,453000,China [3]School of Mechanical Engineering,Anyang Institute of Technology,Anyang,455000,China [4]Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo,315201,China

出　　处：《Journal of Rare Earths》2024年第10期1882-1888,共7页稀土学报（英文版）

基　　金：Project supported by the National Key Research and Development Program of China(2021YFB3500300);the National Natural Science Foundation of China(51931007,51871005,52201212,52271161);General Program of Science and Technology Development Project of Beijing Municipal Education Commission of China(KM201710005006);the Program of Top Disciplines Construction in Beijing(PXM2019_014204_500031)。

摘　　要：Due to its large magnetocrystalline anisotropy field and high Curie temperature,SmCo-based magnets are irreplaceable in high-temperature applications,The hot-deformed SmCo-based magnets are especially attractive for their excellent corrosion resistance,making them more suitable for harsh environments.However,it is still challenging for hot-deformed SmCo-based magnets to obtain high magnetization and high coercivity simultaneously.Therefore,it is necessary to analyze the relationship between its microstructure and magnetic properties and explore its magnetic hardening mechanism to guide the further improvement of magnetic properties.In this paper,the anisotropic heterostructure SmCo_(5)magnet was prepared by combining large height-reduction and introducing a nano-grained Smrich phase.Strong c-axis texture,(BH)m of 16.1 MGOe,and H_(ci)of 9.6 kOe were obtained via the heterostructure with SmCo_(5)micron-grain and Sm-rich nano-scale precipitates.The magnetic domain observation and technical magnetization analysis demonstrate that the coe rcivity mechanism is dominated by nucleation.The results also show that the smooth and Sm-rich precipitated grain boundary provides weak pinning effects.It provides a reference for the development of high-pe rformance nanocrystalline SmCo_(5)magnets.

关 键 词：Permanent magnet HETEROSTRUCTURE Rare earths Coercivity mechanism Hot-deformed SmCo magnet 

分 类 号：TM273[一般工业技术—材料科学与工程]