Strain-Hardening Behavior and Novel Flow Stress Modeling of AA6110-T6 Aluminum Alloy at Evaluated Temperatures
摘要
The AA6110-T6 aluminum alloy was investigated under tensile loading at room and elevated temperatures up to 300 °C at a constant strain rate of 10-3 s-1. The investigation focused on the mechanical properties and deformation behavior of the alloy, which are crucial for complex applications requiring precise mechanical characteristics at high temperatures. Understanding these properties is essential to address distortion phenomena that can occur during heat treatment. Deformation behavior was investigated using Kocks–Mecking analysis. Flow stresses at different temperatures were predicted by several constitutive models with and without temperature sensitivity. The particle swarm algorithm was used to determine and optimize the material constants of all models. It was found that Ludwik, Hollomon, Swift, Ludwigson, and Voce models exhibited good predictive performance in the hardening regime for each temperature. The modified Voce model was suggested for accurately predicting flow stress over a wide range of strains. The Johnson–Cook, Zerilli–Armstrong, and combined models were used to estimate flow stress at elevated temperatures. However, they revealed a high deviation with an error of about 20-33%. The novel constitutive model with the coupled effect of temperature and strain was introduced to calculate the flow stresses of AA6110-T6 aluminum alloy at different temperatures. It provided excellent predictive performance with an error of only 1.96%. Finally, a flow stress prediction diagram using the novel constitutive model was established as a function of the true strain and temperature.–