Stress-strain curves and microstructure evolution of 2D70aluminum alloy were analyzed by isothermal constant strain rate compression deformation test at 350

5

30℃and strain rate of 0.001

1

s

-1

.The flow stress equation and dislocation density model of 2D70aluminum alloy were established under the given conditions.And DEFORM-3Dfinite element software was used to simulate the microstructure of the alloy.The results show that the dynamic recrystallization of 2D70aluminum alloy at 350℃can result in the more refinement of alloy grains under a lower strain rate(0.001s

-1

).The S-Al

2

CuMg phase is decreased greatly to be dissolved into the matrix and theα-Al phase grains is decreased gradually with increasing in strain rate when the deformation temperature reaches 470℃.The size ofα-Al phase is decreased with increasing in strain rate.Theα-Al phase grains are coarsened with deformed at a lower strain rate(0.001s

-1

).Simulation comparison reveals that the grains in the simulated microstructure are well in agreement with the evolution of metallographic microstructure.