Despite　the　high　theoretical　energy　product　and　low　material　cost　of　Fe-rich　2:17-type　Sm-Co-Fe-Cu-Zr　magnets,　it　is　still　a　big　challenge　to　simultaneously　achieve　high　energy　product　and　high　coercivity　due　to　damaged　cellular　nanostructure,　i.e.　insufficient　cell　boundary　precipitates.　In　this　work,　both　high　energy　product　(∼30.29　MGOe)　and　high　coercivity　(∼26.24　kOe)　have　been　achieved　in　Fe-rich　Sm24.8CobalFe20.5Cu5.2Zrx　(x　wt%)　magnets　through　optimizing　Zr　content.　It　reveals　that　raising　Zr　content　from　1.5　wt%　to　2.5　wt%　can　effectively　refine　the　cellular　nanostructure,　which　corresponds　to　an　increased　volume　fraction　of　cell　boundary　precipitates.　However,　excess　Zr　content　(e.g.　above　2.5　wt%)　leads　to　the　formation　of　micron-sized　Zr-rich　Zr6Co23　soft　magnetic　particles,　weakening　the　hard　magnetic　performance.　In　particular,　the　high　Zr-content　(3.5　wt%)　magnet　exhibits　strongly　inhomogeneous　chemistry　as　well　as　cellular　nanostructure　in　the　vicinity　of　micron-sized　Zr6Co23　particles　(i.e.　heterogeneous　distribution　of　cell　boundary　precipitates),　deteriorating　both　squareness　factor　and　coercivity.　As　a　result,　the　optimum　magnetic　property　combination　is　achieved　at　an　intermediate　Zr　concentration　by　balancing　the　contradictive　effects　between　cell　refinement　and　soft　magnetic　impurities.　©　2024