Effect of Porosity on Tensile and Compressive Deformations of Superplastic Zn-22AI Alloy Foam

摘要

Closed-cell Zn-22Al superpiastic alloy foams were manufactured through the melt foaming process. The Zn-22Al foams were produced with varying porosity of 51-71%. The tensile and compressive properties of the Zn-22Al foams were investigated at 523 K. The compressive specimen has m-value of 0.55 in the low strain rate region. This is because of the superpiastic deformation induced by the fine microstructure of the cell wall. Though the superpiastic elongation was not obtained in high temperature tensile test, the elongation was higher than that of conventional aluminum foams.