Effect of Dispersoids and Intermetallics on Hardening the Al-Si-Cu-Mg Cast Alloys

Figure 7

(a) Bright field electron micrograph of the precipitation of Al-Zr-Ti dispersoids in alloy D in the as-cast condition, (b) map of Zr distribution in (a), (c) EDS spectrum corresponding to white circle in (a), and (d) approximate composition of particles in (a). The average size of Zr-rich precipitates in (a) is about 20–30 nm.

(a)

(b)

(c)

(d)