Abstract
The superplastic deformation of mechanically alloyed aluminum has been shown to occur at unusually high strain rates. Although superplastic elongations of up to 570% have been obtained, the strain rate sensitivity, m, is low, between 0.25 and 0.3. An analysis of the threshold stresses present due to the dispersed particles indicates that the rate limiting deformation mechanism is not grain boundary sliding (which was observed), but solute atom drag of dislocations in the bulk of the grains. Deformation in the superplastic regime occurs without cavitation, due to rapid diffusion and easy intragranular slip to accommodate stress concentrations in the boundary
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