Effect of SiC Nanoparticles on the Mechanical and Metallurgical Properties of Friction Stir Welded ۶۰۶۱ Aluminum Alloy

Friction stir welding (FSW) is a solid-state joining process widely used for joining similar and dissimilar metals as well as for the fabrication of metal matrix nanocomposites. In this study, the effect of adding silicon carbide (SiC) nanoparticles on the mechanical properties of friction stir welded ۶۰۶۱ T۶ aluminum alloy sheets in a butt joint configuration was investigated. Experiments were conducted to determine the optimum rotational speed, welding speed, and nanoparticle content. Rotational speeds of ۷۰۰, ۱۰۰۰, and ۱۲۵۰ rpm and welding speeds of ۴۰, ۷۰, and ۱۰۰ mm/min were used. In addition, SiC nanoparticles with weight fractions of ۰.۱ wt.% and ۰.۲ wt.% were introduced into the joint line prior to welding. The results showed that the best mechanical properties were achieved at a rotational speed of ۱۲۵۰ rpm and a welding speed of ۴۰ mm/min. Compared with samples welded under the same conditions without nanoparticle addition, the mechanical strength of the joint was improved. This improvement can be attributed to the presence of SiC particles, which restrict dislocation movement, increase nucleation sites for recrystallized grains, and promote grain refinement in the aluminum structure at the weld zone. Microstructural analyses performed using optical microscopy and scanning electron microscopy confirmed these observations.

کلیدواژه ها:

Friction Stir Welding ، Silicon Carbide (SiC) Nanoparticles ، Microstructure ، Mechanical Properties ، ۶۰۶۱‑T۶ Aluminum Alloy