Thermal stability of microstructure in the AK4-1 and AK12D aluminum alloys after their joint friction stir processing

This work is aimed at evaluating the possibility of increasing the thermal stability of microstructure of AK4-1 (Al-Cu-Mg-Fe-Si-Ni) aluminum alloy with a matrix type structure. To achieve this goal, AK12D (Al-Si-Cu-Ni-Mg) aluminum alloy with a structure similar to the microduplex one was locally mixed into the investigated alloy via friction stir processing. The subsequent T6 heat treatment was carried out according to the standard regime for the AK4-1 alloy. Studies have shown that the stir zone had an elliptical shape with an onion-ring structure. This structure represented alternating rings with different amount and size of excess phase particles. At the same time, the ring width and average area of excess phase particles were larger in the center of the stir zone compared to the periphery where the ring width and average particle cross section area were smaller. The average particle cross section area in the rings with a higher content of excess phases was smaller than in the rings where their amount was lower. This distribution of excess phases leads to the formation of a fine-grained microstructure, the average size of which depends on the interparticle distance in the α-Al solid solution.

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1. Russian Science Foundation - 22-29-01318