Effects of the Rolling Temperature on the Microstructure Uniformities and Mechanical Properties of Large 2219 Al–Cu Alloy Rings

The microstructure uniformities and mechanical properties of the 2219 Al–Cu alloy ring should be further improved. By whole-process analysis and partial quantitative analysis, this paper studies the microstructure evolution and its influence on the mechanical properties of the 2219 Al–Cu alloy rings undergoing rolling deformation with different deformation temperatures. The results indicate that, when the rolling temperatures are from hot condition to warm condition, the increase of the sub-grain amount leads to more grain refinement after heat treatment; the elongation values clearly increase. The single Goss texture with high volume fraction is changed to be more varieties after heat treatment, having no significant effect on transverse and normal strengths for each sample. The Al₂Cu phases became more dispersed and fragmented, leading to more dissolve, which results in denser precipitates; the yield strengths gradually increase. In addition, the comprehensive properties of the sample on the border are slightly stronger than those on the core, especially for the warm rolling samples.