Study on Flow Stress of 2A70 Aluminum Alloy under Hot Deformation

The flow stress behavior of 2A70 aluminum alloy during hot deformation conditions was studied by isothermal hot compression on Gleeble-1500.The deformation temperature range from 300℃to 500℃ and the strain rate range from(0.01 s~(-1)) to(10 s~(-1).)The experimental results indicated that the flow stress of 2A70 aluminum alloy increases with increasing strain and tends to be constant after a peak value showing dynamic recover;when the strain rate is(1.0 s~(-1)) and the deformation temperature is more than 420℃,the flow stress saw tooth fluctuates,showing discontinuous dynamic recrystallization.The deformation activation energy of 2A70 aluminum alloy is 180.83 kJ/mol from constitutive equation.