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Abstract:The effects of artificial aging process on A356-T6 / 6061-T6 FSW joints were investigated by OM, SEM, universal mechanical testing and microhardness testing. And then its influence mechanism was discussed. The results showed that the tensile strength and yield strength of the joints were improved significantly after artificial aging,and the elongation was decreased. When the aging process is 165℃/5h,the tensile and yield strength of the joints were reach to 285MPa and 240 MPa,about 96.6% and 90% of A356-T6 base material, respectively. The tensile and yield strength of the joints were improved 35.7% and 60% compared to pre-aging, respectively,but the elongation was decreased by 40%. Morever,the hardness of the weld zone was improved after artificial aging. And the hardness distribution was changed due to difference of increasing amplitude,which resulted the low hardness region and fracture location transferred from the heat-affected zone on the returning side to the advancing side. At last,the area fraction and particle size of the second phase were reduced effectively,and the roundness was improved after artificial aging.The area fraction increasing and size coarsening of second phase were occurred when the aging temperature is too high or the aging time is too long.
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