Microstructure and extrinsic magnetic properties of anisotropic Sm (Fe, Ti, V) 12-based sintered magnets

摘要: Anisotropic SmFe12-based sintered magnets require an optimum microstructure and alloy composition to have a large coercivity μ0Hc and remanent magnetization μ0Mr. In this study, we investigated the microstructure transformation and extrinsic performance change in the anisotropic Sm(Fe,Ti,V)12-based sintered magnets via reducing the Ti content and partially substituting Fe with Co. Reduction of Ti content in anisotropic sintered Sm8Fe73.5+xTi8-xV8Ga0.5Al2 magnet eliminated the secondary Fe2(Ti,V) phase, resulting in a remanence of μ0Mr = 0.8 T and energy density of (BH)max = 113 kJ/m3 (14.2 MGOe) in x = 3. A relatively high coercivity μ0Hc of 0.6 T is maintained owing to the formation of thin intergranular phase (IGP). Substitution of Co for Fe in the Sm8(Fe0.95Co0.05)73.5Ti8V8Ga0.5Al2 sintered magnet resulted in a low remanence and low coercivity μ0Hc. The electron backscatter diffraction (EBSD …