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Integrating stress enhanced recovery into a work hardening model
This study reports on the development of a dislocation based model and its application to recovery. The model calculates the flow stress and dislocation density evolution during annealing. In order to validate the model, the recovery behavior of a commercial aluminum alloy was investigated by means of three alternative experimental methods: stress relaxation (SR), double tension tests with load (DTL) and unloaded (DTU). The experimental results revealed that external stresses have a significant impact on the recovery processes. Accordingly, external stresses are considered in the model, which enables to distinguish between stress-free and stress-enhanced recovery. In the current contribution, a respective dislocation based model is introduced.