The dynamic superplasticity of aluminum alloys is considered from the point of view of the nonequilibrium phase transition theory. The macrokinetic analysis of superplastic deformation mechanisms is carried out on the basis of the model representing stress, temperature and kinematic characteristics relationship, with energy function of the state being considered in the form of assembly catastrophe potential. Analytical expression is proposed for the function of aluminum alloy sensitivity to the structural transformations, which are connected, in superplasticity conditions, with dynamic recrystallization mechanism. During recrystallization the grain is split and the structure becomes fine-grained. The interconnection of this expression with the evolutionary equations of the model describing alloy deformation regularities in the wide temperature strain-rate ranges, including superplasticity, is presented.Keywords: nonequilibrium phase transition theory, dynamic superplasticity, aluminum alloys, dynamic recrystallization
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