Assessing the HAI-model and the composite model of high temperature creep for a solid solution nickel-base alloy

摘要

The Haasen-Alexander-Ilschner (HAI-) theory of internal and effective stresses enables to model creep of a nickel-base solid solution alloy under constant strain rate ( #epsilon# ) and stress ( #sigma# ) conditions, respectively. Howevr, for correctly predicting steady-state creep the long-range back stress #sigma# _b of hard subgrains incorporated by the composite model of plastic eformantion has to be taken into account.