The hot compression simulation of 7055 aluminum alloy was carried out on the Gleeble-1500D thermal simulator.The characteristics of hot compressive structure under different reductions was observed by OM and EBSD.The mechanical properties after heat treatment were tested

and the effects of hot deformation reduction on the microstructure and mechanical properties of 7055 aluminum alloy were investigated.The experimental results indicate that with the increase of reduction

the grains are significantly elongated

and the coarse second phase are stretched along the grain boundaries

and even broken up.Dynamic recrystallization locally occurrs in 7055 aluminum alloy

which is attributed to strain-induced grain boundary migration.With the decrease of the volume fraction of recrystallization and the increase of grain contained sub-structure in 7055 aluminum alloy after heat treatment

mechanical properties of the alloys are improved greatly.The optimum mechanical properties can be obtained with the 79%reduction.