Stress-Strain Curves of Pure Aluminum and Al-4.5mass%Cu Alloy in Semi-Solid State

Abstract

The information of the mechanical properties, such as elastic modulus, is necessary to be calculated the hot tearing by CAE. The stress-strain curves in semi-solid state of pure aluminum and Al-4.5mass%Cu alloy, whose deformation behaviors had been classified into four stages in the previous study, were investigated in this study. Shapes of stress-strain curves in semisolid state changed with temperature as same as deformation behaviors. Elastic modulus calculated from stress-strain curves were smaller than that calculated by general commercial software. This difference of elastic modulus was about three to five orders of magnitude in Pa. This difference would be caused by the melting of grain boundary and the disappearance of connection between solid phases in general commercial software. Elastic modulus obtained by the stress-strain curve should be more appropriate for calculation of the hot tearing by CAE than that calculated by commercial software.