Tensile properties and hot tearing susceptibility of cast Al–Cu alloys containing excess Fe and Si
来源期刊：International Journal of Minerals Metallurgy and Materials2021年第4期
论文作者：Khalil Ganjehfard Reza Taghiabadi Mohammad Talafi Noghani Mohammad Hossein Ghoncheh
摘 要：This study was undertaken to investigate the tensile properties and hot tearing susceptibility of cast Al–Cu alloys containing excess Fe（up to 1.5 wt%） and Si（up to 2.5 wt%）.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-Cu Fe 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-Cu Fe 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.
Khalil Ganjehfard1，Reza Taghiabadi1，Mohammad Talafi Noghani1，Mohammad Hossein Ghoncheh2
1. Faculty of Engineering, Imam Khomeini International University(IKIU)2. Department of Mechanical Engineering, University of New Brunswick
摘 要：This study was undertaken to investigate the tensile properties and hot tearing susceptibility of cast Al–Cu alloys containing excess Fe（up to 1.5 wt%） and Si（up to 2.5 wt%）.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-Cu Fe 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-Cu Fe 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.
关键词：
