Abstract
Sm(CobalFe0.245Cu0.07Zr0.02)7.8 (at%) sintered magnets with high remanence (Br ~1.15 T) were prepared using a traditional powder metallurgy method. Tunable magnetic properties, especially intrinsic coercivity (Hcj), were obtained through adjusting isothermal procedure parameters. Hcj of the magnets increases from 305 to 752 kA · m−1 with isothermal annealing time increasing from 3 to 20 h, while Br of the magnets almost keeps constant. From the bright field transmission electron microscopy (TEM) images, it is found that: (1) there is dispersed precipitated phase with very small size in the magnet annealed for 3 h, while the magnets annealed for 20 h have distinct and intact cellular structure; (2) the number density of Z-phase in magnet annealed for 20 h is bigger than that for 3 h. Besides, the finer microstructures were studied with high-resolution transmission electron microscopy (HRTEM).
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