Large Coercivity and High Remanence in Iron-Rich 2:17-Type SmCo Magnets:Effect of Dislocation on Solid-Solution Precursors

Iron-rich 2:17-type SmCo magnets are expected to achieve high performance and relatively low cost. However, inhomogeneous cellular structures usually exist in iron-rich magnets, resulting in a drastic reduction in coercivity and energy product. Herein, a strategy is proposed to regulate the dislocation by decreasing the Sm content and extending the solid-solution duration in precursor of iron-rich SmCo magnet. High-density dislocations in precursor contributed to 1:5H nucleation, leading to uniform cellular structures in final magnets. As a result, a remarkable intrinsic coercivity of 1.50 T and one of the highest remanences (1.24 T) are simultaneously achieved in the iron-rich Sm₂₅Co₄₂Fe₂₆Cu₅Zr₂ (wt%) magnet. This study provides valuable insights into the design and development of iron-rich 2:17-type SmCo magnets.