The annealing behavior of cold rolling (CR) sheets of continuous casting (CC) Al-1.5Cu alloy by using a tensile machine, optical and scanning electronic microscopes, and X-ray diffraction method was evaluated and studied overall. Compared with AA2024, Si and Fe amounts of the alloy were controlled at a low level; Mn and Mg amounts were controlled at a low limit of AA2024 alloy; Cu is selected at a low level (1.1-2.2%) due to the requirement of twin belt continuous cast processing. Compared to AA5xxx and AA3xxx alloys, material characteristic after annealing at different temperatures of cold rolling sheets of the Al-1.5Cu alloy are very different with some interesting special findings, such as the precipitation and solid solution of AlCu phase as well as P orientation ({011}<566>) texture appearing, and so on. Annealing curves show a V shape with the annealing temperature increase. The findings would affect potentially and importantly subsequent processing (such as solid solution heat treatment, quenching, forming, and aging) for application (replace AA5xxx-O sheet) to low-cost auto forming parts or sheets.
