Tensile properties and hot tearing susceptibility of cast Al–Cu alloys containing excess Fe and Si  

作　　者：Khalil Ganjehfard Reza Taghiabadi Mohammad Talafi Noghani Mohammad Hossein Ghoncheh 

机构地区：[1]Faculty of Engineering,Imam Khomeini International University(IKIU),Qazvin,Iran [2]Department of Mechanical Engineering,University of New Brunswick,Fredericton,NB,Canada

出　　处：《International Journal of Minerals,Metallurgy and Materials》2021年第4期718-728,共11页矿物冶金与材料学报（英文版）

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 theα-Fe phase was the dominant Fe compound.Increasing the Fe/Si mass ratio above unity increased the amounts of detrimentalβ-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 theβ-Cu Fe platelets disrupted the tear healing phenomenon by blocking interdendritic feeding channels,while theα-Fe intermetallics improved the hot tearing resistivity due to their compact morphology and high melting point.

关 键 词：aluminum–copper alloys CASTABILITY FLUIDITY hot tearing susceptibility 

分 类 号：TG146.21[一般工业技术—材料科学与工程]