Abstract
This paper discusses the different types of creep behavior reported for the steady-state deformation of the superplastic Zn-22% Al eutectoid alloy at low stress levels. All existing theories of creep behavior predict that at sufficiently low stresses the steady-state creep will be diffusion-controlled and will follow a power-law with a strain rate exponent of m = 1.0. The question is whether this diffusional creep mechanism sets the lower bound on superplastic deformation in typical samples of Zn-22% Al, or whether another type of creep behavior intervenes.
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