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J. Kreyca, A. Falahati, E. Kozeschnik:
"Modelling microstructure evolution in polycrystalline aluminium - Comparison of one and multi-parameter models with experiment";
Talk: 18th International ESAFORM Conference on Material Forming, Graz; 2015-04-15 - 2015-04-17; in: "Materials Forming ESAFORM 2015", scientific.net, Key Engineering Materials (Volumes 651-653) (2015), ISSN: 1662-9795; 587 - 591.

The plastic response of an aluminium alloy type A6061 is modelled using different state parameter-based approaches. Several of these models (one-, two- and three-parameter models) have recently been implemented into the thermo-kinetic software package MatCalc. In the present work, these models are compared in terms of capabilities and predictive potential and correlated with experimental data. The experimental work presented here is performed on a Gleeble 1500 thermo-mechanical simulator for various temperatures, strain rates and typical heat treatment conditions, i.e., solution annealed and quenched, naturally aged, artificially aged to peak hardness and overaged. We demonstrate that one-parameter models offer a ready-to-use and easy-to-calibrate solution for a rough correlation between flow-curve data and microstructure. Such models describe the evolution of the average dislocation density in time. In many practical cases, a single state parameter is insufficient and multi-parameter models are utilized, for instance, with consideration of separate populations of dislocations in walls and subgrain interior. These approaches can consistently represent the deformation behaviour of alloys in a variety of conditions with respect to temperature and strain rates.

http://dx.doi.org/10.4028/651-653.587