Abstract
The kinetics of grain growth in a Zn-22% Al alloy during static annealing and superplastic deformation (SPD) is studied. SPD is found to enhance the rate of grain growth the stronger, the higher is the strain rate. The dependences of the grain growth rate on the strain rate, strain and annealing time are obtained. The contributions of static annealing and of deformation to the grain size increase are estimated. Possible mechanisms controlling the grain growth rate under static annealing and dynamic annealing are discussed. The rate of grain growth in the superplastic alloy is found to be controlled by solute diffusion along the grain boundaries. The mechanism of grain growth during SPD in the alloy is proposed which provides a good quantitative agreement with experimental data.
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