Quantitative assessment of superplastic deformation behavior in a commercial 5083 alloy

This paper describes the constitutive equation for the superplastic commercial 5083 (Al–Mg–Mn–Cr) alloy effective in a temperature range of 773–843 K and at a strain-rate range from 10−5 to 4×10−3 s−1. The superplastic properties have been investigated using velocity jump tests. The analysis of the experimental results reveals that the true stress exponent is two, and the true activation energy for superplastic flow is similar to the lattice self-diffusion of aluminum (142 kJ mol−1). All mechanical data can be represented by a single constitutive equation for superplasticity according to the Dorn equation.