Figure 5. Microstructure of the faceted phase in irregular eutectic alloys.

In each of the three cases given, five representative gaps or holes are circled in green for clarity. (a) Front view of the eutectic colony showing the Ge phase in orange, this work. (b) Eutectic Si flake, extracted from a deep-etched Al-Si specimen by Hellawell⁶. The black lines correspond to multiple twin traces. Reproduced with permission from Elsevier⁶. (c) Eutectic Al₅FeSi plates in an Al-Fe-Si alloy, the crystallization of which was imaged via in situ XRT by Terzi et al.²⁵ Reproduced with permission from Elsevier²⁵. Scale bar 50 μm (a), 200 μm (b) and 150 μm (c).