1985 Volume 26 Issue 4 Pages 259-270
The superplastic behaviour of Zn–Al eutectoid and near eutectoid alloys was investigated in the present study with the help of statistical design of experiment. The first part of the paper describes quantitatively the singular and joint effects of strain rate, temperature, grain size and Al–content on the total ductility and maximum flow stress, when all of them were varied simultaneously at constant levels of different processing factors. An adequate regression model for predicting total ductility in the given ranges of variation of strain rate, temperature, grain size and %Al was also developed. The regression equation was exploited to locate the optimum region of total ductility by applying an appropriate optimisation technique. The second part of the paper presents the effects of different processing factors on total ductility. These effects were evaluated by varying simultaneously all the processing factors in the near-optimum region of ductility.
