Abstract The fraction of primary Si and primary α–Al in Al–Si eutectic alloy were largest after modification at 740 °C when a certain amount of Al–3P was added. The fraction of primary Si and primary α–Al in Al–Si eutectic alloy first increased and then decreased with increasing amount of Al–3P. The fraction of primary Si and primary α–Al in the Al–Si eutectic alloy was largest when the added amount of Al–3P modifier was 0.4wt.%. The fraction of primary Si and primary α–Al decreased with further increased Al–3P modifier. The size of the primary Si decreased continuously. Compared to the unmodified Al–Si eutectic alloy, the tensile strength and elongation of the alloy modified with 0.4wt.% Al–3P at 740 °C increased by 7% and 74%, respectively.

中文翻译：

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Al-3P中间合金改性Al-Si共晶合金的组织和力学性能

摘要 添加一定量的Al-3P时，Al-Si共晶合金中初生Si和初生α-Al的比例在740℃变质后最大。随着Al-3P含量的增加，Al-Si共晶合金中初生Si和初生α-Al的比例先增加后减少。当Al-3P改性剂的添加量为0.4wt.%时，Al-Si共晶合金中初生Si和初生α-Al的比例最大。随着 Al-3P 改性剂的进一步增加，初生 Si 和初生 α-Al 的比例降低。初级硅的尺寸不断减小。与未改性的 Al-Si 共晶合金相比，添加 0.4wt.% Al-3P 的合金在 740 °C 下的拉伸强度和伸长率分别提高了 7% 和 74%。