Compression test was carried out and the true stress-strain curves were obtained from the hot compression of 7085 alloy. A\nnumerical simulation on the deformation behavior of 7085 aluminum alloy during the backward extrusion was also performed\nby finite elementmethod. The results show that dynamic recrystallization occurs in the hot compression of 7085 alloy and the peak\nstress reaches higher values as the strain rate increases and deformation temperature decreases. The backward extrusion processes\ninclude contact deformation, initial deformation, and steady deformation. Severe plastic deformation of shear and compression\noccurs when the metal flowed into the channel between fillet of punch and wall of die so that the grain size can be refined by\nbackward extrusion. The deformation in the region of top of wall is too small to meet the mechanical properties of requirements\nand the metal usually needs to be trimmed.The experiments with the same parameters as simulation had been carried out and the\nexperimental cup after extrusion has better quality.
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