Microstructures and coercivity mechanism of 2:17-type Sm-Co magnets with high remanence

作者：Sun, Wei; Zhu, Ming-Gang^*; Fang, Yi-Kun; Liu, Zhi-Ying; Guo, Zhao-Hui; Li, Wei

来源：Rare Metals, 2022, 41(4): 1353-1356.

DOI：10.1007/s12598-015-0513-6

• Microstructures
• Coercivity mechanism
• 2:17-type SmCo permanent magnet

Sm(CobalFe0.245Cu0.07Zr0.02)(7.8) (at%) sintered magnets with high remanence (B-r similar to 1.15 T) were prepared using a traditional powder metallurgy method. Tunable magnetic properties, especially intrinsic coercivity (H-cj), were obtained through adjusting isothermal procedure parameters. H-cj of the magnets increases from 305 to 752 kA center dot m(-1) with isothermal annealing time increasing from 3 to 20 h, while B-r 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).

• 出版日期2022-4
• 单位钢铁研究总院