Abstract��The microstructure characteristics and mechanical properties of 9 m diameter 2219 aluminum alloy ring were comprehensively analyzed. And the experiment results showed that the mechanical properties of 9 m diameter 2219 aluminum alloy ring satisfied the requirement of AMS 4144F Aerospace Material Specification�� but the ring still need to be improved in microstructure and distribution of precipitated phase to further upgrade its comprehensive properties. After the forging-cogging process�� Al2Cu phase was broke down�� and the size of grains was 100-200 ��m after forging. After the ring rolling process�� the grain was elongated along the peripheral direction and the size of grains grew up to about 200-400 ��m�� and the grain was coarsened in the rolling deformation process. During the tensile process�� the hard-brittle Al2Cu phases can dissever the matrix to form the crack source�� which was the main factor leading to the low elongation of the ring along the radial and axial direction.
2018, Vol. 36 
