Effect of Feed Rate in FSW on the Mechanical and Microstructural Properties of AA5754 Joints

Figure 4

The microstructure of the stir zone (SZ) for friction stir welded samples at 1070 rpm and three feed rates: (a) 36 mm/min; (b) 70 mm/min; (c) 140 mm/min. Left and right columns correspond to the same location but different magnifications.

(a)

(b)

(c)