Abstract
The deformation behaviour of a Zn-1, 1 wt. % Al alloy was investigated at 293 and 373 K in a wide range of strain rates. The strain rate sensitivity is a complex function of temperature and strain rate. The maximum strain rate sensitivity occurs at higher strain rates as temperature is increased. The activation energy for superplastic flow was estimated and it was found to be close to that for grain boundary diffusion in zinc. The nature of superplastic deformation is discussed as an interconnection of grain boundary glide, boundary migration and dislocat ion slip.
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