To expand the application of aluminum alloy parts fabricated by wire arc additive manufacturing (WAAM) in industries, it is crucial to reduce porosity and refine the microstructure to improve mechanical properties as pores and non-uniform microstructure are major defects. In this study, bilateral friction stir post-processing (B-FSP) was used as post-processing to the parts made by WAAM. The microstructural evolution after B-FSP deformation and the strengthening mechanisms were investigated. As compared to the conventional WAAM processing of Al-Si alloy, it was found that the introduction of B...
