Mechanism of dislocation promoting Al13Fe4 precipitation during friction stir-assisted incremental sheet forming in AA5052 sheet

The precipitation behavior of Al13Fe4 in AA5052 sheet during friction stir-assisted incremental sheet forming (FS-ISF) is investigated in the present work. It is found that the sizes of both incoherent and semi-coherent precipitates enlarge, and their contents increase with the increasing temperature caused by the high-speed rotation of the tool. Dense dislocations emerge and interact around these precipitates. Transmission electron microscopy (TEM) analysis reveals that dislocations can induce precipitation through prompting atomic segregations of Fe and Al elements. The strength of FS-ISFed AA5052 is further enhanced compared with conventional incremental sheet forming at room temperature (RT-ISF).

Automated summary

The precipitation behavior of Al13Fe4 in AA5052 sheet during friction stir-assisted incremental sheet forming (FS-ISF) is investigated in this study. It is found that both incoherent and semi-coherent precipitates increase in size, and their content increases with the temperature caused by the high-speed rotation of the tool. Dense dislocations emerge and interact around these precipitates. Transmission electron microscopy (TEM) analysis reveals that dislocations can induce precipitation by promoting atomic segregations of Fe and Al elements. The strength of FS-ISFed AA5052 is further enhanced compared to conventional incremental sheet forming at room temperature (RT-ISF).