A series of isothermal compression experiments and then followed solution treatment were performed with 2A70 aluminum alloy specimens on a Gleeble-1500 thermal simulator under different conditions of strains,temperatures and strain rates.Analysis of the influences of hot deformation parameters on microstructure of 2A70 aluminum alloy shows that the grain size of 2A70 aluminum alloy declines with the increase of deformation and strain rate,while it increases with the increase of deformation temperature.On th...