Optimization of Parameters for the Friction Stir Processing and Welding of AA۱۰۵۰ Aluminum Alloy

Friction-Stir Processing (FSP) was applied on AA۱۰۵۰ Aluminum Alloy (AA) to find the highest mechanical properties among ۲۸ combinations of the rotational and traverse speed (۸۰۰-۲۰۰۰ rpm and ۵۰-۲۰۰ mm.min-۱) and four different tool probe shapes (threaded, columnar, square and triangle). To this aim, the AA standard sheet went through a single pass of FSP. The ۱۶۰۰ rpm and ۱۰۰ mm.min-۱ with threaded tool probe was chosen as the best combination of rotational and traverse speed. Grain size at the Stirred Zone (SZ) was studied using Optical Microscopy (OM). The results showed that the SZ’s grain size was refined from ۳۰ μm down to about ۱۲ μm due to dynamic recrystallization during FSP. The processed sample exhibited improved hardness, yield stress, ultimate tensile strength, elongation up to ۶۵, ۸۰, ۶۶, and ۱۴%, respectively, compared to the annealed AA sample. Studying fractographic features by OM and field emission scanning electron microscope (FESEM) revealed a dominantly ductile fracture behavior.

کلیدواژه ها:

friction stir processing ، AA۱۰۵۰ aluminum alloy ، tool probe shape ، grain structure ، mechanical properties ، rotational and traverse speed.