Morphological transition of eutectic NiAl 3 phase in Al–Mg 2 Si cast alloys.

Two- and three-dimensional morphological features of eutectic NiAl3in Al–Mg2Si were studied in detail. It is found that eutectic NiAl3transforms from enormous irregular shapes to fine regular rods, and the transition is related to (Al+Mg2Si) binary eutectic during the process of eutectic structural evolution. The explanation about the morphological change was discussed and analyzed in terms of the detailed microstructural observation of nucleation and growth patterns. [ABSTRACT FROM AUTHOR]