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In this paper, the effect of Y content on hot tearing properties of cast Al-Cu-Mg alloy was studied. The effect and mechanism of Y on hot tearing of cast Al-4.4Cu-1.5Mg-0.15Zr alloy were studied by analyzing the microstructure evolution, phase structure, solidification process and hot tearing sensitivity coefficient of the alloy with different Y additions, and determined the appropriate amount of Y element. The results showed that Y improves hot tearing resistance of Al-4.4Cu-1.5Mg-0.15Zr alloy by refining microstructure and reducing the solidification temperature range. The suitable amount of Y is 0.15 wt%. At this time, a certain amount of Al 6 Cu 6 Y low melting point phase is formed in the alloy, and the grain structure is the smallest, which significantly improves the hot tearing resistance of Al-4.4Cu-1.5Mg-0.15Zr alloy. The microstructure coarsening and hot tearing tendency increase with increasing Y content. The experimental results are basically consistent with the hot tearing sensitivity predicted by the Clyne-Davies model.

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