Abstract
Al-2.5 Li-1.2 Cu-0.6 Mg-0.12 Zr (wt%) alloy sheet was cold-rolled, solution heat-treated for 20 min at 510° C, prestrained by 3% and superplastically deformed at 450 to 540° C at strain rates between 1×10−4 and 2.8×10−1 sec−1. The maximum elongation obtained was 300%. Significant cavitation occurred above about 0.5 strain at a rate (void volume/unit strain) of 4% at 540° C and 6% at 500° C. The onset of cavitation coincided with a reduction in the room-temperature tensile properties after reheat-treatment. During annealing at 500 to 540° C, grain coarsening near the sheet surface was associated with magnesium and lithium depletion. Superplastic deformation produced a fine equiaxed microstructure by dynamic recrystallization.
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Shakesheff, A.J., Partridge, P.G. Superplastic deformation of Al-Li-Cu-Mg alloy sheet. J Mater Sci 21, 1368–1376 (1986). https://doi.org/10.1007/BF00553277
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DOI: https://doi.org/10.1007/BF00553277