Influence of characteristic eutectic free microstructure on mechanical and corrosion response of spark plasma sintered hypereutectic Al-Si alloy

Spark plasma sintered hypereutectic Al-Si alloy, free from characteristic eutectic microstructure was evaluated for its mechanical and corrosion behaviour in comparison with conventional cast microstructure having coarser primary Si and acicular eutectic Si. In SPSed microstructure, Al region free from acicular eutectic imparts substantial failure strain under compression loading. Absence of coarser primary Si and acicular eutectic Si in SPSed microstructure prevents the rate of anodic dissolution, specifically at the Al-Si interface and enhances corrosion resistance than the cast microstructure in 3.5 wt% NaCl corrosive medium.

Automated summary

The spark plasma sintered hypereutectic Al-Si alloy exhibited superior mechanical properties and corrosion resistance compared to conventional cast microstructure, showing higher failure strain and enhanced corrosion resistance in a 3.5 wt% NaCl corrosive medium due to the absence of coarse primary Si and acicular eutectic Si in the SPSed microstructure.