摘要：The effects of TiB_(2) and Zr on the microstructure,aging response and mechanical properties of hot-extruded Al-Zn-Mg-Cu based materials were investigated and compared by multi-scale microstructure characterization *** results showed that proper addition of TiB_(2) particles could refine grain size during solidification,promote dynamic recrystallization during extrusion,and inhibit grain growth during solution ***,Zr addition had minor influence on the grain refinement during solidification,but could effectively suppress recrystallization and grain growth compared with the Zr-free ***,the TiB_(2) addition could simultaneously enhance the aging kinetics and peak-aged hardness of the ***,Zr addition could also improve the peak-aged hardness with minor effect on the aging kinetics of the ***,the quench sensitivity,elastic modulus and tensile properties of the materials were compared and ***,the relationship between the microstructure and mechanical properties,and the strengthening mechanisms were discussed in detail.