Abstract-The surfaces of cast A356 plates of nominal composition (wt. %): Al-7.3 Si-0.6 Mg were subjected to Friction stir processing (FSP) to decrease the porosity level and the size of second phase particles which, in turn,will improve mechanical properties. Three tool travel and five tool rotational speeds were employed.Forthe best combinations of the process variables the alloy displayed an increase of about 31% in tensile strength and 29 % in yield strength compared with the cast alloy. The ductility increase ranged between 1.2 and 8 times the value for the cast alloy. Microscopy revealed that in the processed alloy the size of the second phase particles had decreased and this contributed to improvements in properties.
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