Constitutive equations in creep of 7B04 aluminum alloys

A unified ageing–creep constitutive model has been developed for the analysis and simulation of the correlation between the mechanical properties and strain and age creep parameters of aluminum alloy. The input parameters of the equation consist of initial stress level and heat treatment parameters. The outputs of this model include property parameters namely: creep strain, yield strength, precipitates relative volume fraction, and mean radius of precipitates. The model can be used to describe the development of microstructure and yield strength following creep time. The current study achieved a good performance and the results are in agreement with experimental knowledge in different stress levels. The development of the yield strength from the precipitates hardening of view is analyzed and discussed in detail.