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应用重熔/液淬技术研究了铸态Al-21%Cu和Al-28%Cu合金的梯度熔化,以及铸态Al4.5%Cu合金的整体熔化行为。研究结果表明:α-Al枝晶熔化后的液相在一定的温度下存在着大量的枝晶熔化“残片”,这些溶质含量低的枝晶“残片”可以作为合金随后凝固过程的有效结晶晶核。由此进行了高温过热及低温重熔Al-4.5%Cu合金在砂型和铝金属型中的凝固对比实验,后者的宏观晶粒组织得到了明显的细化,证明了合金的熔化控制技术可作为细化铸件宏观组织的有效途径。
Gradient melting of as-cast Al-21% Cu and Al-28% Cu alloys and global melting behavior of as-cast Al4.5% Cu alloy were studied by remelting / liquid quenching techniques. The results show that there are a large number of dendrite melting “residues” in the liquid phase after α-Al dendrite melting, and these dendritic “fragments” with low solute content can be used as the effective crystallization of the alloy after solidification nuclear. Thus, a comparative experiment on the solidification of Al-4.5% Cu alloy with high temperature and low temperature remelting in sand and aluminum metal was carried out. The latter macroscopic grain structure was obviously refined, which proved that the melting control Technology can be used as an effective way to refine the macroscopic organization of castings.