Abstract Both SmCo5 and Smn+1Co5n−1-type phases were identified in the Sm25Co42.9Fe23.5Cu5.6Zr3.0 (wt.%) commercial sintered magnet even at the solution-treated state, with the 1:5H cell boundary phase occupying pyramidal planes, the 1:3R (n = 2) thin platelets occupying some basal planes, and the mixture of 1:3R, 2:7R (n = 3) and 5:19R (n = 4) phases distributing at grain boundaries. The mixed Smn + 1Co5n − 1-type phases at grain boundaries act as primary sinks and lead to sparse 1:5H-precipitates surrounding them after isothermal aging. It clearly reveals that the 1:5H cell boundaries are formed at the early decomposition stage and why they are rare at grain boundaries in the aged magnets.

中文翻译：

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在 2:17 型 Sm-Co-Fe-Cu-Zr 永磁体中鉴定 smco SmCo5 和 smSm + co1Co5 − 1 型相

摘要 SmCo5 和 Smn+1Co5n-1 型相在 Sm25Co42.9Fe23.5Cu5.6Zr3.0 (wt.%) 商业烧结磁体中即使在固溶处理状态下也被识别，1:5H 晶胞边界相占据锥面、1:3R (n = 2) 薄片占据一些基面，以及分布在晶界的 1:3R、2:7R (n = 3) 和 5:19R (n = 4) 相的混合物。晶界处的混合 Smn + 1Co5n - 1 型相充当主要汇，并在等温老化后导致围绕它们的稀疏 1:5H 沉淀。它清楚地揭示了 1:5H 晶格边界是在早期分解阶段形成的，以及为什么它们在老化磁体的晶界处很少见。