Abstract
The elevated temperature ductility of rapidly solidified 7091 P/M Al alloy was explored in the temperature range of 523–723 K making use of strain rate change and constant crosshead speed tensile tests. The alloy exhibited a maximum strain rate sensitivity of 0.3 and 190% elongation despite its initial fine grain size of 2 µm. This relatively low ductility is attributed to partially recrystallized microstructure and preferential distribution of fine oxide particles. The alloy was subjected to a thermomechanical treatment involving solutionizing treatment (763 K/3 h) followed by water quenching, overaging (603 K/36 h) and warm rolling at 423 K to ∼ 80% reduction in area. With this treatment, a maximum of 450% elongation at 573 K and 623 K and a strain rate of 8 X 10-5 S-1 was observed. The optimal superplastic behavior is associated with continuous recrystallization and the consequent fine grain size.
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