The article describes an experimental method for estimating the true flow stress at superplastic deformation. Studied changes of the true stress at superplastic deformation in optimally mode the precipitation-hardening alloy of cobalt-nickel-niobium. The microstructure of the alloy according to the extent of superplastic deformation.

This article presents the results of investigation of the influence of holding temperature during the quenching process on the microstructure and superplasticity of the Co-Ni-Nb alloy. Temperature-strain rate intervals of the deformation of the superplasticity effects are stated. The optimal regimes of the preliminary treatment by quenching and rolling as well as the routine of the superplastic deformation of the Co-Ni-Nb alloy are defined. The interval of the temperatures of the precipitation, morphology, composition, type and parameters of the lattice of the secondary phase, which appears after the annealing + rolling (to 90%) Co-Ni-Nb alloy, are determined.

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