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J. Kreyca, A. Falahati, E. Kozeschnik:
"Microstructure and flow stress modelling during plastic deformation of an aluminum alloy type A6061";
Talk: Conference MEFORM 2015, Light Metals - Forming Technologies and Further Processing, Freiberg; 2015-03-25 - 2015-03-27; in: "Conference MEFORM 2015, Light Metals - Forming Technologies and Further Processing", Materials Today: Proceedings, Volume 2, Supplement 1 (2015), ISSN: 2214-7853; 107 - 112.

The deformation behavior of an A6061 aluminum alloy in different heat treatment conditions of natural aging is simulated in a state parameter-based microstructure evolution approach. It is shown that at least two state parameters are required for modelling experimental flow curves at lower temperature accurately. In the present model, the evolution of dislocation densities inside subgrains and in subgrain boundaries are introduced as state parameters. The evolution of these parameters is modeled based on the individual mechanism of dislocation generation and storage and dynamic annihilation and recovery. We propose a convenient method to derive the adjustment parameters of the model from experimental data. The model predictions are validated by a series of compression tests carried out on a Gleeble 1500 thermo-mechanical simulator, where the A6061 alloy is tested for variable natural ageing times after quenching. The comparison between simulation and experiment shows good agreement and demonstrates the predictive capabilities of the state parameter-based approach.

deformation behaviour A6061 Kocks

http://dx.doi.org/10.1016/j.matpr.2015.05.026