A Review Study on the Main Sources of Porosity in Al-Si Cast Alloys

Figure 16

Backscattered electron images of shrinkage porosity in B319 + 0.8%Fe showing the following: (a) β-platelets, (b) α-Fe-polished sample, (c) α-Fe-fracture surface, (d) π-Fe, and (e) EDS spectrum corresponding to (d) showing reflections due to Al, Si, Mg, and Fe and (f) rare earth metal platelet-white arrow indicates the restriction of pore growth same as β-Fe platelets.

(a)

(b)

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(f)