The effects of friction stirring processing(FSP)on the microstructure and mechanical properties of YL112 aluminum alloy for automotive were investigated.The results show that the porosity of YL112 aluminum alloy is significantly reduced after friction stirring pro-cessing,the dendritic structure inside α-Al is severely damaged,and the larger second phase particles and the needle-like Si phase in YL112 aluminum alloy are decomposed effectively.The decomposed products are uniformly redistributed in the melting core region of fric-tion stirred processing,which refines the microstructure of YL112 aluminum alloy.In addition,the friction stir processing significantly in-creases the tensile strength and elongation after fracture of YL112 aluminum alloy.In the region with low ductility and high porosity,YL112 aluminum alloy is susceptible to fracture,and the microstructure of the YL112 aluminum alloy is restructuring after friction stir pro-cessing,the YL112 aluminum alloy shows superior comprehensive mechanical properties.
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