Microstructure and Conductivity of the Al-Cu Joint Processed by Friction Stir Welding

Figure 4

The SEM image of interface layer of the Al-Cu FSW joint produced by (a) 750 rpm-0°, (b) 950 rpm-0°, (c) 1180 rpm-0°, and (d) 1500 rpm-0°.

(a)

(b)

(c)

(d)