Abstract
Microstructural evolution during thermomechanical processing (TMP) of a superplastic Al10Mg0.1Zr (weight percent alloy was studied. The TMP was carried out at 300 °C and consisted of 12 rolling passes corresponding to a total strain of 2.5. Superplastic elongations at 300 °C exceeded 1000% for an optimum processing schedule involving a 30 min interpass anneal (IPA) time. Precipitation of the intermetallic β-phase (Al8Mg5) was complete at an accumulated strain of 1.5 and the precipitate particle size and size distribution were found to be nearly constant for the remainder of the TMP. Particle stimulated nucleation (PSN) of recrystallization associated with prolonged IPA times accounted for the grain refinement necessary to support superplastic deformation. A model for PSN is applied to the data.
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