This study was undertaken to investigate the tensile properties and hot tearing susceptibility of cast Al-Cu alloys containing excess Fe (up to 1.5wt%) and Si (up to 2.5wt%). According to the results, the optimum tensile properties and hot tearing resistance were achieved at Fe/Si mass ratio of 1, where the α-Fe phase was the dominant Fe compound. Increasing the Fe/Si mass ratio above unity increased the amounts of detrimental β-CuFe platelets in the microstructure, deteriorating the tensile properties and hot tearing resistance. Decreasing the mass ratio below unity increased the size and fraction of Si needles and micropores in the microstructure, also impairing the tensile properties and hot tearing resistance. The investigation of hot-torn surfaces revealed that the β-CuFe platelets disrupted the tear healing phenomenon by blocking interdendritic feeding channels, while the α-Fe intermetallics improved the hot tearing resistivity due to their compact morphology and high melting point.

进行这项研究以研究含有过量Fe（至多1.5wt％）和Si（至多2.5wt％）的铸造Al-Cu合金的拉伸性能和热撕裂敏感性。根据结果​​，在Fe / Si质量比为1时，以α-Fe相为主要的Fe化合物，获得了最佳的拉伸性能和耐热撕裂性。将Fe / Si质量比提高到大于1会增加微结构中有害的β-CuFe片晶的数量，从而降低拉伸性能和耐热撕裂性。将质量比降低至低于1会增加硅针和微结构中的微孔的尺寸和比例，也损害了拉伸性能和耐热撕裂性。