On the mechanism of strain-enhanced grain growth during superplastic deformation

Superplastic deformation is often accompanied by grain growth, the rate of which depends on both strain and strain-rate, and is usually well in excess of that found in the absence of deformation. Two models for this process have been developed. In the first, which is most applicable to single phase materials, we assume that the deformation enhancement of grain growth is due to the damage created at triple junctions by grain boundary sliding. A …