Superplastic deformation behavior of only -4%AL alloy

Abstract

This paper studies the superplastic deformation behavior and microstructure changes of Zn-4%Al alloy after different micronization treatments (~1μm). The results show that: hot rolling, quenching and cold rolling can all exhibit superplasticity as long as the grains are refined in the three states; when the alloys in the three states are stretched at a speed of V card = lmm/mim, the elongation changes with temperature. Two peaks. Microstructure observation shows that the grains grow larger and tend to become equiaxed after superplastic tensile deformation. In addition to thermal growth at this temperature, strain also has a significant impact on grain growth. Zn-4%Al alloy produces cavities during superplastic deformation, and most of the cavities are elongated parallel to the tensile axis. Finally, the sample breaks due to the connection of the cavities.