A new optimization approach for superplastic forming of Mg AZ31 alloy is presented and
experimentally validated. The proposed new optimization approach is based on a multiscale
failure criterion that takes into account both geometrical necking and microstructural
evolution, yielding a variable strain rate forming path instead of the commonly used constant
strain rate approach. Uniaxial tensile tests and free bulge forming experiments, in
conjunction with finite element analysis, are used to evaluate the proposed optimization …