Forming and effect of dispersoids in Al-Zn-Mg-Cu-Zr-Yb aluminum alloy

The forming and effect of dispersoids in Al-Zn-Mg-Cu-Zr-Yb aluminum alloy were studied by OM,EDS,SEM,TEM and mechanical properties tests.The results show that the Al-Zn-Mg-Cu-Zr-Yb alloy formed abundant homogeneous tiny Al3(Zr,Yb) dispersoids with coherent L12 structure;Compared with Al3Zr dispersoids in Al-Zn-Mg-Cu-Zr,Al3(Zr,Yb) dispersoids could effectively inhibit recrystallization,resulting in the increase of yield strength and fracture toughness by 6% and 35%,respectively.