关键词: 铝塑膜, AA8021合金, 铝箔, 微观组织, 力学性能

Abstract: AA8021 alloy aluminum foils with a thickness of 0.04 mm were prepared by using semi continuous ingot hot-rolled AA8021 alloy sheet and multiple cold rolling+intermediate annealing processes, then the effects of cold rolling and annealing processes on the microstructure and properties of the aluminum-plastic film foil were studied. The results indicate that adding intermediate annealing between the hot rolling and cold rolling does not significantly improve the final deep drawing formability of the foil, and may even lead to grain growth and unevenness in the finished foil material. In order to ensure that the final product can obtain finer grain size during annealing, a complete recrystallization intermediate annealing process between the cold rolling passes is necessary to ensure that the solute atoms such as Fe and Si can be more fully precipitated. The heating rate of intermediate annealing and finished annealing has no significant effect on grain size, but the annealing temperature has a significant impact on it. The intermediate annealing temperature at 350 ℃ has a smaller grain size than that at 380 ℃, and the finished annealing temperature at 250 ℃ leads to a smaller grain size than that at 310 ℃. The cold foil rolling can significantly break and refine the grains of hot-rolled billets, but it is difficult or less likely to break the second phase particles. Controlling the balance of cold rolling processing rate before and after intermediate annealing, as well as the temperature of the coil and lubricating oil during cold foil rolling after intermediate annealing, can minimize the occurrence of processing softening problems during cold foil rolling, refine the grain structure of the finished product, and improve product performance.

Key words: aluminium-plastic film, AA8021 alloy, aluminium foil, microstructure, mechanical properties