<p>Magnesium alloys with exceptional specific strength, low density, and castability are reported as potential candidates for transportation and aerospace applications. Here, we investigated the impact of strontium (Sr) modification on the microstructure and mechanical properties of extruded Mg-6Al-Si-1.6Ce alloys. Melting, casting, and subsequent hot extrusion methods were employed to fabricate the alloys with Sr concentrations of 0, 0.2, 0.4, and 0.6 wt.%. Grain structure, dynamic recrystallization behavior, and texture evolution were examined using optical microscopy, scanning electron microscopy, x-ray diffraction, and electron backscatter diffraction techniques. Sr modification significantly tailors the grain structure and facilitated the formation of thermally stable Al₃SrCe and Mg₂Si intermetallic phases. In addition, it also enhanced DRX nucleation and texture evaluations. Mechanical tests indicated that the alloy with 0.6 wt.% Sr achieved the best balance of strength and ductility, with a yield strength of approximately 280 MPa and an elongation of around 20%. The improved mechanical performance is attributed to the combined effects of grain refinement, DRX-induced microstructural enhancement, and the uniform precipitation of strengthening phases. Our results indicate that precise Sr addition is an effective strategy to enhance the microstructure and mechanical properties of Mg-6Al-Si-1.6Ce alloys for lightweight structural applications.</p>