Abstract
Friction stir processing (FSP) was applied to extruded Al–Mg–Sc alloy to produce fine-grained microstructure with 2.6 μm grains. A maximum elongation of 2150% was achieved at 450 °C and a high strain rate of 1 × 10−1 s−1. Although the grains obtained by FSP were much larger than those by other techniques, such as equal-channel angular pressing, approximately the same superplasticity was achieved at an even higher strain rate in the FSP alloy.
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