Abstract
It is well-known that strain-induced grain growth is a characteristic feature of superplastic deformation (SPD) of various materials. Such grain growth has been observed over the whole investigated interval of strains in quasi-single phase superplastic aluminum alloys 7475, Neopral and 5083. At the same time observations indicating dynamic recrystallization in region II of SPD for four aluminum alloys with an initially completely recrystallized structure (with the grain size before SPD no more than 10 {micro}m) have been presented by the authors. The purpose of this study was to investigate the peculiarities of the change of grain size with the increase of sample elongation under SPD at maximum strain rate sensitivity, m, of an aluminum alloy with initial completely recrystallized ultra-fine grain structure.
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