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Effects of Cu content on the microstructure, mechanical property, and hot tearing susceptibility of die casting hypereutectic Al–22Si–0.4Mg alloy

Published online by Cambridge University Press:  02 November 2016

Daqiang Cheng ,
Liang Zhang ,
Guohua Wu ,
Jimei Mao Open the ORCID record for Jimei Mao [Opens in a new window]  and
Wencai Liu
Daqiang Cheng
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Liang Zhang*
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Guohua Wu
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Jimei Mao
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Wencai Liu
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effects of Cu content on the microstructure, mechanical property, and hot tearing susceptibility of die casting Al–22Si–0.4Mg alloy have been investigated. Different Cu contents (1.5, 2.5, 3.5, 4.5 wt%) were added in Al–22Si–0.4Mg alloy. In the as-cast microstructure, the amount, volume fraction, and average size of Al2Cu phase increase with more Cu addition. The morphology of grain boundary white Al2Cu phase turns from particle to lump. The UTS (ultimate tensile strength) of Al–22Si–xCu–0.4Mg alloy improves with Cu added, which is mainly caused by the strengthening effect of intergranular Al2Cu. The hot tearing susceptibility apparently rises with Cu content increased, which is due to longer quaternary eutectic reaction time, larger amount of residual intergranular Cu-rich liquid film spreading out over α-Al grain boundary, and higher quaternary eutectic reaction temperature. Considering both the mechanical property and hot tearing susceptibility, optimal Cu content for die casting Al–22Si–0.4Mg alloy found in this paper is 2.5 wt%.

Keywords

Al–22Si–xCu–0.4Mg alloydie castingas-cast microstructuremechanical propertyhot tearing susceptibility
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 22 , 28 November 2016 , pp. 3629 - 3637
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Copyright
Copyright © Materials Research Society 2016 

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