Effect of Sr-P Interaction on the Microstructure and Tensile Properties of A413.0 Type Alloys

Figure 6

Variation in the morphology of eutectic Si particles in A413 alloy as a function of alloy/heat-treated condition: ((a) and (b)) as cast, unmodified, (c) as cast, modified with 240 ppm Sr, ((d) and (e)) modified and SHT for 8 h at 505°C, (f) modified and SHT for 8 h at 540°C, and (g) modified and SHT for 100 h at 540°C. Note the polyhedral/polygonal morphology of the Si particles in (e–g); (h) an enlargement of the circled area in (g) showing the growth of Si particles by coalescence of the adjacent Si particles. SHT: solution heat treated.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)