Morphological transition of eutectic NiAl₃ phase in Al–Mg₂Si cast alloys

ABSTRACT

Two- and three-dimensional morphological features of eutectic NiAl₃ in Al–Mg₂Si were studied in detail. It is found that eutectic NiAl₃ transforms 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.

KEYWORDS:

• Al–Mg₂Si alloys
• morphology
• eutectic reaction
• NiAl₃

CLC NUMBER:

• TB331

Document code:

• A

Funding

Sponsored by: National Science Fund for Distinguished Young Scholars of China (No. 51325401), National Natural Science Foundation of China (No. 51404169) and the Project of Natural Science Foundation of Tianjin (No. 15JCQNJC03200).