Superplasticity in a powder metallurgy Al-Cu-Zr alloy

The Al-Cu-Zr alloy was prepared from the rapidly solidified powder. The res ulting fine grained structure contains mostly low angle interfaces. The gra dual increase in the mean misorientation angle between neighbouring grains occurs during plastic deformation at temperatures between 700 and 773 K. Su perplastic behaviour was found at temperatures between 700 and 750 K at the strain rates of the order 10(-2) s(-1). The loss of superplasticity observ ed both at low strain rates and at higher temperatures was explained on the base of structure development.