WT5BZ]The Al Zn Mg Sc Zr alloy was prepared by ingot metallurgy processing The tensile mechanical properties of the studied alloys at different treatments were tested and the microstructure and mechanical properties of the alloy was studied by using optical microscope and transmission microscope The results show that the minor Sc and Zr can greatly fine the grain size of the Al Zn Mg alloy ingots. Minor Sc and Zr can remarkably improve the properties of the Al Zn Mg alloys. The strengthening me...