【摘要】 通过OM、SEM、EBSD等技术分析了不同凝固条件下共晶Si的生长行为。结果表明：共晶Si存在从平界面→胞状晶→树枝晶的转变过程。同一个共晶（团）晶粒的Si相和α相都不是单晶体。Al、Si两相共生生长过程中，共晶α可通过重复形核、亚晶界以及小角度晶界来调整生长位向以满足两相耦合生长的要求。更多还原

【Abstract】 The growth behavior of eutectic Si under different solidification conditions was analyzed by using of OM, SEM, and EBSD. The results show that the eutectic Si has a transformation process from flat interface→cellular crystal→dendritic crystal. The Si phase and α phase in the same grain are not single crystals. During the co-growth process of Al and Si, eutectic α can adjust its growth position to meet the requirements of two-phase coupling growth by repeating nucleation, sub-grain boundary and small-angle grain boundary.更多还原