Study on Thermal Deformation Performance of 7075 Alloy
Using Gleeble-3800 hot machine,along with raw materials axis 0°,45°,90° direction,samples was cut into style.At temperature 320 ℃,400 ℃ and 480 ℃,with deformation rate 0.01 / s,0.1 / s and 1 / s of 7075,the influence of temperature,strain rate on the thermal deformation of 7075 aluminum alloy in the process of mechanical properties and microstructure were tested.The results show that: at the same strain rate of 7075 aluminum alloy,the required deformation of flow stress and steady-state flow increase with temperature strain reduce;in the low temperature,the shape of the grain size of the forming is continuous and even;along with the deformation temperature increasing,grains gradually become bulky;at high temperature,large deformation grains around the tiny equiaxial crystal appear,andthere is dynamic recrystallization.At the same temperature,the deformation of 7075 aluminum alloy rheological stress improves with the increase of strain rate;the greater the strain rate,the more probability that dynamic recrystallization forms.