Abstract
The tensile deformation behavior of samples made of magnesium and titanium alloys with superplastic layer(s) was investigated. It was observed that deformation took place by means of layer-by-layer shear in the superplastic region. Traces of such shear were visible to the unaided eye on the surface of the deformed specimens. The spacing of these shear surfaces was about 6–8 grains. It is suggested that superplastic deformation proceeds by cooperative grain shear along two intersecting grain boundary systems oriented at approximately 45°–60° to the tensile axis. Using optical microscopy and back-scattered electron imaging on a scanning electron microscope, traces of shear systems were also observed on the prepolished surfaces of deformed magnesium alloy samples and the etched surfaces of deformed titanium alloy samples.
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