Abstract: Effect of different processes on microstructure and properties of 2219-T3 aluminum alloy plates was studied by metallographic observation, room temperature tensile and electron backscatter diffraction analysis. The analysis results indicate that, following by 1-5 days of room temperature parking, the solution quenched 2219 aluminum alloy plate achieves the T3 state after undergoing cold deformation, and its yield strength at room temperature progressively increases with the prolongation of natural aging time. Additionally, the yield strengths of the plates in the T3 state increase with the increase of cold deformation; however, after reaching a deformation of 7%-8%, further cold deformation has a limited effect on the increase in yield strength, and the elongation decreases. The specimens after room temperature parking for 3 days and then cold deforming show a better match between strength and plasticity. Further microstructure analysis shows that the specimens after cold deformation do not change the recrystallized structure formed in the solid solution, and KAM analysis shows that a more homogeneous distribution of dislocations is formed within the grains, which ensure the retention of the atomic clusters that play a greater role in strengthening in the T3 state.

Key words: 2219 aluminum alloy, solution treatment, room temperature parking, cold deformation, microstructure and properties