论文部分内容阅读
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。
The effect of Zn content (0, 0.5%, 1.5% and 4.5%) on the susceptibility to hot cracking in Mg-2% Y alloys was investigated using a constrained-bar experimental device with load cell and data acquisition system. Experimental results show that the hot-cracking susceptibility of the alloy without addition of Zn is the least. With the increase of Zn content, the hot cracking susceptibility of Mg-2% Y alloy is enhanced. When the content of Zn is 1.5%, the maximum value is reached, and then the susceptibility to hot cracking decreases with increasing Zn content. In the process of solidification, as the Mg-1.5Zn-2Y alloy has a larger shrinkage force and the release rate of coagulation shrinkage force, resulting in the hot cracking susceptibility of the alloy tend to be the most. The hot cracks in the Mg-xZn-2Y-based alloys are initiated and propagated along dendrites or grain boundaries. ProCAST software simulates the tendency of the alloy to be susceptible to thermal cracking and is consistent with the experimental results.