Two phenomenological models to predict the single peak flow stress curves up to the peak during hot deformation

Based on both linear and nonlinear estimations of work hardening rate versus strain curves, two mathematical models have been developed to predict the stress-strain curves under hot working conditions up to the peak stress. The models were validated for a mechanically alloyed Al6063/0.75Al(2)O(3)/0.75Y(2)O(3) nanocomposite compressed under different hot forming conditions. The predicted results from both models are found to be in accord with the experimental flow stress curves up to the peak. For the present system, the linear model is found to more accurately predict the flow stress (with an average error of 0.81%) relative to the nonlinear model (with an average error of 2.06%). (C) 2016 Elsevier Ltd. All rights reserved.