Abstract
In this study, we are pleased to report a low-alloyed Mg–1.0Zn–0.45Ca–0.35Sn–0.2Mn (wt. %) alloy sheet fabricated by hot rolling, showing superplastic deformation ability with tensile elongation of ~410%±30% at 573 K and 1 × 10−3 s−1. The superplasticity is co-dominated by grain boundaries sliding (GBS) and solute drag creep. Unlike high-alloyed Mg alloys with dispersed precipitates, this low-alloyed system keeps its fine-grained microstructure by the co-segregation of Zn and Ca atoms at grain boundaries (GBs) coupled with a few precipitates. Although the co-segregation of Zn and Ca atoms at GBs are not favored for GBS, the resulting superior thermostability is of great importance to achieve superplastic deformation. Thus, we put forward a new path in achieving superplasticity in low alloyed Mg alloys by using a complementary thermodynamic and kinetic stabilization approach.
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