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Formation of Fe-rich intermetallic compounds and their effect on the tensile properties of squeeze-cast Al–Cu alloys

Published online by Cambridge University Press:  07 August 2015

Wei-wen Zhang ,
Bo Lin ,
Zhi Luo ,
Yu-liang Zhao  and
Yuan-yuan Li
Wei-wen Zhang
Affiliation:
Department of Material Forming and Control Engineering, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China
Bo Lin*
Affiliation:
Department of Material Forming and Control Engineering, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China; and Department of Material Forming and Control Engineering, School of Mechanical Engineering, Gui Zhou University, Guiyang 550025, People's Republic of China
Zhi Luo
Affiliation:
Department of Material Forming and Control Engineering, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China
Yu-liang Zhao
Affiliation:
Department of Material Forming and Control Engineering, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China
Yuan-yuan Li
Affiliation:
Department of Material Forming and Control Engineering, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China
*
a)Address all correspondence to this author. e-mail: linbo1234@126.com
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Abstract

The development of high performance Al–Cu based alloys generally depends on the strict control of the Fe content. However, with the increasing use of recycled aluminum alloys, it is necessary to increase the tolerance for the Fe content in Al–Cu cast alloys for the purpose of low cost, energy saving, and environment protection. In this study, the formation of Fe-rich intermetallics and their effect on the tensile properties of squeeze-cast Al–5.0 wt% Cu–0.6 wt% Mn alloys with an Fe content of up to 1.5 wt% have been investigated. The full formation sequence of squeeze-cast Al–5.0 wt% Cu–0.6 wt% Mn alloys with different Fe contents has been established. The results were also compared with the corresponding results obtained for Al–5.0Cu–0.6Mn alloys prepared by gravity die casting. It is found that the Fe-rich intermetallic compounds mainly consist of α-Fe and β-Fe in alloys with a low Fe content, changing into Al6(FeMn) and Al3(FeMn) for alloys with a high Fe content. The applied pressure promotes the formation of the Fe-rich intermetallics α-Fe/Al6(FeMn) and prevents the precipitation of needle-like β-Fe/Al3(FeMn). The elongation of the alloys gradually decreases with the Fe content, and a maximum value for both the ultimate mechanical strength and the yield strength was found for the alloys with 0.5 wt% Fe. The tensile properties of alloys with a different Fe content significantly increased as the applied pressure was increased from 0 to 75 MPa, especially the elongation.

Keywords

Alsecond phasesphase transformation
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 16 , 28 August 2015 , pp. 2474 - 2484
Copyright
Copyright © Materials Research Society 2015 

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