Prediction on hot deformation behavior of spray-formed 7055 aluminum alloy via phenomenological models
(1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. School of Light Alloys Research Institution, Central South University, Changsha 410083, China)
2. School of Light Alloys Research Institution, Central South University, Changsha 410083, China)
Abstract: Hot compression tests in the temperature range of 340-450 °C and strain rate range of 0.001-1 s-1 of spray-formed 7055 aluminum alloy were carried out to study its hot deformation behavior. Three phenomenological models including Johnson-Cook, modified Fields-Backofen and Arrhenius-type were introduced to predict the flow stresses during the compression process. And then, a comparative predictability of the phenomenological models was estimated in terms of the relative errors, correlation coefficient (R), and average absolute relative error (AARE). The results indicate that Johnson-Cook model and modified Fields-Backofen model cannot well predict the hot deformation behavior due to the large deviation in the process of line regression fitting. Arrhenius-type model obtains the best fit through combining the effect of strain rate and temperature.
Key words: spray-formed 7055 aluminum alloy; hot deformation behavior; phenomenological models; statistical analyses