Abstract
Several sets of experimental results are available for steady state flow in the superplastic Zn-22%Al eutectoid alloy. It is shown that these data are reasonably consistent in the intermediate region II but that there are marked discrepancies in region I at low stress levels. In region II the extensive experimental data indicate an activation energy Q II for grain boundary diffusion, a stress exponent n II of about 2.0, an exponent for the inverse grain size, p II , of about 2.0 and a dimensionless constant in the rate equation, A II , of about 15. However, the precise experimental values of A II may vary by several orders of magnitude because of the interrelationship between A II , n II , p II and Q II : in practice, the value of A II is increased when the experimental values of n II , p II and/or Q II are high. As a result of this interrelationship, it is not possible to interpret the various values reported for A II in Zn-22%Al in terms of substructural variations in the different materials.
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