Abstract
The operation of intragranular dislocation slip at small, optimum and high strain rates of superplastic deformation (regions I, II, III) was observed by texture analysis and diffraction electron microscopy in the Zn-Al alloys. It is established that a change of predominant slip in the (0001) 〈112̄0〉 system in the Zn-phase of the Zn-2% Al alloy for slip in the ¦112̄2¦ 〈112̄3̄〉 system in the Zn-50% Al alloy occurs at small strain rates at increasing Al-content. At increasing ϵ operative slip systems increase in number and the operation of multiple intragranular slip is observed in the region of optimum strain rates (region II). Extrinsic grain-boundary dislocations were detected during super-plastic deformation, what gives evidence for non-equilibrium grain-boundary structure. The analysis of experimental data shows the close interconnection between grain-boundary sliding and intragranular slip under the conditions of superplastic flow.
Published Version
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