Abstract
Superplastic properties of an advanced Al-Li-Mg-Cu-Sc alloy with finegrained microstructure produced by two different processing ways (equal-channel angular extrusion and hot rolling) were studied in the temperature range of 350−525°C and at strain rates of 1.4×10−3–1.4×10−1 s−1. In both conditions the total elongations of about 400% were obtained at 450°C and a strain rate of 1.4×10−2 s−1 indicating a high strain rate superplasticity. The higher homogeneity of microstructure in the condition after equal-channel angular extrusion resulted in higher elongations and lower cavitation during superplastic deformation as compared to the hot rolled condition.
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