Research Article
A Review Study on the Main Sources of Porosity in Al-Si Cast Alloys
Figure 17
Backscattered electron images of porosity occurring due to precipitation of high temperature compounds: (a) Mg2Sn particles; note: the presence of Mg2Sn arm lying within the dendrites (white rectangle), (b–d) Al2Si2Sr particles, (e) high Ti-containing RE intermetallic-note the absence of cavities around the star-like particles as indicated by the white arrows, (f) segregation of Al3Ti phase particles, (g) precipitation of massive AlTiBSr phase particles, (h) precipitation of both AlTi and AlSr particles.
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