T6 heat-treated AlSi10Mg alloys additive-manufactured by selective laser melting

摘要

A two-stage T6 heat treatment has been proposed to tailor mechanical properties of the selective laser melting fabricated AlSi10Mg alloy. The process included solid solution at 535°C and artificial aging at 158°C for 10 h. The densification, hardness and oxidation behavior have been investigated after T6 heat treatment. The results demonstrate that the hardness of the T6 heat-treated samples are lower than untreated ones. This is because a fine-grained recrystallization microstructure develops during solid solution. Oxides aggregation and dimple distribution occurred due to sufficient diffusion at the artificial aging of the second stage.