State Parameter-Based Simulation of Temperature- and Strain Rate Dependent Flow Curves of Al-Alloys

Abstract

When simulating the material behavior during thermo-mechanical processes, the understanding of the microstructure evolution is fundamental. Therefore, state parameter-based models are utilized to describe physical effects such as work hardening, precipitation hardening, solid solution hardening and cross core diffusion. Using the thermo-kinetic software package MatCalc, temperature- and strain rate dependent flow curves of compression tests are successfully simulated. The theoretical background of the underlying physical models and the influence of alloying elements on the cross core diffusion behavior are discussed. Various Al-alloys are investigated and the experimentally obtained flow curves are evaluated in terms of initial strain hardening rate, initial yield stress and saturation stress. In Al-alloys, especially the effect of Mg is dominant due to its ability to diffuse from the compression side to the tension side of the dislocations core, leading to additional barriers for the dislocation movement.