The microstructure evolution of an Felt Hats aluminum silicon-based alloy after severe plastic deformation processing was examined.An aluminum silicon-based alloy; Al-7wt%Si-2wt%Fe, was processed by the severe plastic deformation technique called high-pressure torsion at room temperature under a high pressure of 6.0 GPa and rotational speed of 1.0 rpm with numbers of revolution up to 5 turns.
Microstructure evolution, especially intermetallic phase, was observed using an optical microscope Electric Kettles and a scanning electron microscope (SEM).The effects of high-pressure torsion on the Fe intermetallic compounds in Al-Si alloy were investigated.It was found that the intermetallic particles decreased in size with increasing imposed strains.