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J. Kreyca, E. Kozeschnik:
"Thermally activated strain hardening in Al-alloys";
Talk: 63. Metallkunde Kolloquium, Lech am Arlberg; 2017-04-18 - 2017-04-21.

Starting with an overview of existing physical models for thermally activated strain hardening, a new model is introduced describing the temperature and strain rate dependent stress strain response of Al alloys. Based on the observation that the Kocks Mecking model is fully determined by an initial strain hardening rate and a saturation stress, expressions are derived for the thermal activation of these two quantities and introduced in the modeling framework. We demonstrate that our model properly takes into account the deformation mechanisms of dislocation glide at low temperatures and vacancy assisted dislocation climb in the region of power-law creep at high temperatures. The integral model is compared with other physical models for thermally activated strain hardening and validated on experimental data from literature.