The Effect of Cu on the Microstructure and Tensile Properties of Near Eutectic Al-Mg2Si Alloy

This study was undertaken to investigate the effect of different concentrations of copper (0.5, 1.0, 3.0, and 4.5 wt.%) on the microstructure and tensile properties of Al-Mg2Si near eutectic alloy. The alloy in cast condition consists of dendritic α-Al and eutectic Mg2Si network. The morphology of Mg2Si is mainly flake-like. The microstructural study of the alloy revealed that Cu at higher concentrations (≥ 1 wt.%) introduces hard Cu-rich intermetallics (mainly θ phase) to the system which mainly segregate at the grain boundaries. This provides favored path for crack propagation. As the amount of Cu raises up to 3 wt.%, ultimate tensile strength (UTS) increases from 225 MPa to 285 MPa which shows 26% improvement

کلیدواژه ها:

Eutectic Al-Mg2Si ، Microstructure ، Mechanical properties ، Cu-rich intermetallics