A Sr modifier and an Al-Ti-B grain refiner were simultaneously added to an Al-7Si-0.35Mg cast alloy and the interaction between Sr and Al-5Ti-1B was investigated. The combined additions of 100 ppm Sr and 500 ppm Ti produced both eutectic Si modification and α-Al grain refinement while increasing the nucleation frequency of Al-Si eutectic grains compared to an alloy with the addition of Sr alone. TEM analysis revealed that Al₂Si₂Sr phases existed with either TiB₂ or AlP and TiB₂ coupling particles. This suggests that pre-existing TiB₂ particles in the melt form prolific AlP, the most potent nuclei for Si, and thereby promote the nucleation of the eutectic Al-Si grains during solidification despite the deactivation of AlP consumed for the preceding formation of Al₂Si₂Sr.

将 Sr 改性剂和 Al-Ti-B 晶粒细化剂同时添加到 Al-7Si-0.35Mg 铸造合金中，并研究了 Sr 和 Al-5Ti-1B 之间的相互作用。与单独添加 Sr 的合金相比，100 ppm Sr 和 500 ppm Ti 的组合添加产生了共晶 Si 改性和 α-Al 晶粒细化，同时增加了 Al-Si 共晶晶粒的成核频率。TEM 分析显示Al ₂ Si ₂ Sr 相与TiB ₂或AlP和TiB ₂偶联颗粒一起存在。这表明预先存在的 TiB ₂熔体中的颗粒形成多产的 AlP，Si 最有效的核，因此在凝固过程中促进共晶 Al-Si 晶粒的成核，尽管 AlP 的失活在之前形成 Al ₂ Si ₂ Sr时被消耗。