The superplastic properties and microstructure evolution of a 0 . 15%Zr and 0 . 7%Cu modi ed 6061 aluminium alloy were examined in tension at temperatures ranging from 475 to 600°C and strain rates ranging from 7610 2 6 to 2 . 8610 2 2 s 2 1 . The re ned microstructure with an average grain size of about 11 mm was produced in thin sheets by a commercially viable thermomechanical process. It was shown that the modi ed 6061 alloy exhibits a moderate superplastic elongation of 580% in the entirely solid state at 570°C and e .~2 . 8610 2 4 s 2 1 . Superior superplastic properties (elongation to failure of 1300% with a corresponding strain rate sensitivity coef cient m of about 0 . 65) were found at the same strain rate and a temperature of 590°C, which is higher than the incipient melting point of the 6061 alloy (~575°C). The microstructural evolution during superplastic deformation of the 6061 alloy has been studied quantitatively. The presence of a slight amount of liquid phase greatly promotes the superplastic properties of the 6061 alloy, reducing the cavitation level.MST/5315
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