Heat treatment of aluminium conductive buses made of AD31 alloy after friction stir treatment

Abstract

In this stuidy, the effect of different heat treatment modes on the structure and properties of a conductive busbar made of aluminum alloy AD31, subjected to friction stir processing according to five different schemes, was investigated. Heat treatment was carried out in three modes – T1, T4 and T6, standard for aluminum alloys of the Al-Fe-Si system. It is shown that the morphology of crystallites remains virtually unchanged as a result of T1, T4 and T6 treatments. The electrical conductivity of the studied samples remains within the error limits relative to the original material. T6 treatment leads to an increase in electrical conductivity in all studied samples by an average of 2 MS/m. The maximum increase in electrical conductivity is observed in areas corresponding to the strongest drop in electrical conductivity as a result of FSP.