Flow Stress Behavior of AI-3.5Cu-1.0Li-0.4Mg-0.6Zn-0.3Ag Alloy under Hot Tension

摘要

The hot deformation behavior and microstructure evolution of Al-3.5Cu-l.0Li-0.4Mg-0.6Zn-0.3Ag aluminum lithium alloy were investigated by hot tensile tests on Gleeble-1500 thermal simulator at 480-510 °C and strain rates 0.0001-0.1 s~(-1). The results show that obvious flow steady-state phenomena occur during hot stretching and the main mechanism changes from dynamic recovery to dynamic recrystallization with the increase of temperature and decrease of strain rate. The constitutive equation was calculated using the true stress-strain curve obtained by the hyperbolic sinusoidal pair of deformation activation energy Q and temperature T proposed by Sellars and Tegart. The deformation heat activation energy is 226.783 KJ/mol.