用定向结晶法考察了含镧分别为0、0.1、0.5wt％的铝硅共晶强制稳态生长的温度梯度效应。结果表明,温度梯度的提高使片状共晶相间距λ_f明显减小,而对纤维状共晶相间距λ_r影响很小,从而加大了分叉值λ_f和λ_r间的差别。生长界面过冷和α相枝晶生长的温度梯度效应显著,而且这种效应随镧含量的增加而加强。 The directional crystallization method was used to investigate the temperature gradient effect of forced solid state growth of Al-Si eutectic containing 0, 0.1 and 0.5wt% lanthanum respectively. The results show that the increase of temperature gradient decreases the spacing of lamellar eutectics λ_f significantly, but has little effect on the spacing of fiber eutectic phases λr, so the difference between the bifurcation values ​​λ_f and λ_r is increased. The effect of temperature gradient on the growth of interfacial growth and α-phase dendrite growth is remarkable, and this effect is strengthened with the increase of lanthanum content.