Abstract
Superplastic behavior of an Mg–3Gd–1Zn (GZ31) alloy, processed by extrusion at 653K followed by equal-channel angular pressing (ECAP) at 553K, was investigated by shear punch testing (SPT). A fine grained microstructure with a grain size of 1.7μm and large fraction of high-angle grain boundaries was achieved after processing by ECAP. Shear punch tests were conducted at temperatures in the range of 573–773K and shear strain rates in the range of 0.003–0.130s−1. While the strain rate sensitivity (SRS) index of the as extruded condition was less than 0.22, a high SRS index of 0.51 at 673K was achieved after ECAP. The SRS index of 0.51 and the activation energy of 73kJmol−1 imply that the responsible mechanism for superplasticity after ECAP is grain boundary sliding (GBS) accommodated by grain boundary diffusion.
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