Diffusion deformation behavior of cryo-prestretched 2219 aluminum alloy at elevated temperature

Service performance is important in the subsequent local feature forming of the large thin-wall component manufactured by cryogenic forming. Therefore, the elevated temperature should be controlled. The strain distribution of 2219 cryogenic pre-stretched specimens at different elevated temperatures was analyzed at different gauge lengths. The mechanical properties were also studied through elevated temperature uniaxial tensile tests assisted by the DIC system. The deformation inhomogeneity of the material decreases with the increase in temperature. With the increase in temperature, the elongation of specimens first increases and then slightly decreases.