Microstructure and magnetic properties were studied for the commercial Sm(CoFeCuZr)_z magnets before and after post annealing treatment. The results show that the phases composition and orientation of the magnet do not change after post annealing treatment, but the substantial redistribution of Cu element within multiscale (the microscale crystal grain and the nanoscale cellular structure) is observed simultaneously. In detail, along with the Cu redistribution, the thickness of the Cu-rich Sm(Co,Cu)₅ cell boundary becomes thinner, and the Cu concentration in the boundary increases sharply. The pinning field of domain walls and corresponding coercivity increase remarkably with slight remanence and maximum energy product loss, and the overall magnetic performance of (BH)_max (MGOe)+H_cj (kOe) increases by 54.3% as a result. Moreover, the thermal stability of the magnet improves as well. On the other hand, Cu-lean phenomenon was observed along the grain boundary region, triggering to magnetic domain reversal process and slightly undermining the squareness of the demagnetization curve of the magnet.

_{研究了商业 Sm(CoFeCuZr) z}磁体在后退火处理前后的微观结构和磁性能。结果表明，磁体的相组成和取向在后退火处理后没有改变，但同时观察到Cu元素在多尺度（微米级晶粒和纳米级蜂窝结构）内的大量重新分布。详细来说，随着Cu的重新分布，富Cu的Sm(Co,Cu) ₅ 晶胞边界的厚度变薄，边界中的Cu浓度急剧增加。畴壁的钉扎场和相应的矫顽力随着轻微的剩磁和最大的能量积损失显着增加，( BH ) 的整体磁性能) _max (MGOe)+ H _cj (kOe) 结果增加了 54.3%。此外，磁体的热稳定性也提高了。另一方面，沿晶界区域观察到贫铜现象，引发磁畴反转过程，略微破坏了磁体退磁曲线的方形度。