文摘
The addition of 0.5wt.% Sb with a holding time over 60 min leads to the disappearance of twin and the formation of high number-density Al-rich nano-particles in eutectic Si, which act as nucleation precursors and promote the eutectic nucleation in Al–10Si alloy; A mechanism of precursor nucleation and microstructure transition is proposed, based on the formation of high number-density Al-rich nano-particles; The existence of AlSb clusters in the Al–10Si–0.5Sb melts is eliminated, while Sb–Si repulsive force and Sb–Sb segregation lead to aggregation of Si atoms and precursors, respectively.