Deformation behavior of 1441 aluminum-lithium alloy in the hot rolling temperature range

The hot torsion method using the Gleeble 3800 thermomechanical process simulator and the Torsion module was used to experimentally study the deformation resistance of 1441 aluminum-lithium alloy of the Al – Cu – Mg – Li system in a wide range of equivalent (true) strains (in the interval of 0.01–1.0), temperatures (250–450 оC) and strain rates (0.01–50) corresponding to the hot rolling conditions on a two-stand mill of the DANIELI company at Kamensk-Uralsky Metallurgical Works. To approximate the experimental curves of deformation resistance, a tabular dependence (by points) was used, which can be applied in specialized engineering programs for computer modeling based on the finite element method, for example, in the QForm program. The accuracy of the approximation of the experimental curves was assessed by comparing the calculated and experimental values of the torsion moment depending on the twist angle at different temperatures (250–450 оC) and deformation rates (0.01–50). The relative approximation error was within ±5%. For different temperature-rate conditions, the values of equivalent deformations corresponding to the onset of destruction of the sample material were determined experimentally. It is shown that at a low strain rate (0.01) and high temperatures (450–400 оC), the equivalent strain to failure has a high value. With an increase in the strain rate to 50 and a decrease in temperature to 250–300 оC, the equivalent strain to failure significantly decreases to 0. The research results can be used to improve and optimize the process modes of hot rolling of sheets and strips made of 1441 aluminum-lithium alloy under the conditions of a two-stand mill of the DANIELI company at Kamensk-Uralsky Metallurgical Works.The research was carried out at the expense of a grant from the Russian Science Foundation (agreement No. 23-79-30015) and a co-financing agreement №KK0987F-2023.