采用具有测力传感器和数据采集系统的约束棒实验装置研究 Zn 含量(0,0.5%,1.5%和4.5%)对 Mg?2%Y合金热裂敏感倾向性的影响。实验结果表明，不添加 Zn 元素的合金热裂敏感倾向性最小。随着 Zn 含量的增加， Mg?2%Y 合金的热裂敏感倾向性增强，当 Zn 含量为1.5%时达到最大值，然后随着 Zn 含量的进一步增加热裂敏感倾向性降低。在凝固过程中，由于 Mg?1.5Zn?2Y 合金具有较大的收缩力下降和凝固收缩力释放率，导致该合金的热裂敏感倾向最大。Mg?xZn?2Y 系合金的热裂纹是沿着枝晶或晶界萌生和扩展的。通过 ProCAST 软件模拟合金的热裂敏感倾向性与实验结果一致。
Effects of Zn content (0, 0.5%, 1.5% and 4.5%) on the hot tearing characteristics of Mg?2%Y alloy were studied in a constrained rod casting (CRC) apparatus attached with a load cell and data acquisition system. The experimental results indicate that the hot tearing susceptibility (HTS) is affected by the content of Zn. The Zn-free base alloy shows the lowest HTS. The HTS of Mg?xZn?2Y alloys increases with increasing Zn content, reaches the maximum at 1.5% Zn, and then decreases with further Zn addition. The high HTS observed in the alloy with 1.5% Zn is attributed to its high force release rate and large force drop during solidification. The hot cracks of casting are initiated and propagate along the dendritic or grain boundaries. The predictions of HTS of Mg?xZn?2Y alloys using ProCAST software are in good agreement with the results obtained by experimental measurements.
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