Room temperature quasi-superplasticity behavior of backward extruded Zn-15Al alloys

In the present work, Zn-15Al alloys were fabricated via backward extrusion technology at different temperatures. With the decreasing of extrusion temperature from 350 to 200 °C, the elongation of extruded Zn-15Al alloys increases from 71 to 168%, which implies that the Zn-15Al alloys extruded at lower temperature exhibits room temperature quasi-superplasticity behavior. X-ray diffraction and electron back scattered diffraction analysis demonstrates that the large elongation of Zn-15Al alloys can be ascribed to the refinement in the size of Zn-rich phase and the increasing numbers of Zn-Zn grain boundaries.