Abstract
This study demonstrated that friction stir processing (FSP) could result in a significant improvement in tensile properties of AC8A, particularly in ductility. Both tool rotation rate and traversing speed could affect the strength of FSPed specimens, which was related to the characteristics of coarsening, dissolution and re-precipitation of the strengthening particles. High tool rotation rate enhanced the dissolution of β′ and Q′ particles, which increased the potential for re-precipitation as fine particles. Low tool rotation rate in FSP mainly caused precipitate coarsening.
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