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Effect of solution treatment on microstructure and mechanical properties of cast Al–3Li–1.5Cu–0.2Zr alloy

Published online by Cambridge University Press:  28 March 2016

Yu Peng ,
Antao Chen ,
Liang Zhang ,
Wencai Liu  and
Guohua Wu
Yu Peng
Affiliation:
National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, People's Republic of China
Antao Chen
Affiliation:
National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, People's Republic of China
Liang Zhang*
Affiliation:
National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, People's Republic of China
Wencai Liu
Affiliation:
National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, People's Republic of China
Guohua Wu
Affiliation:
National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effect of solution treatment (ST) on the microstructure and mechanical properties of cast Al–3Li–1.5Cu–0.2Zr alloy was investigated. Results showed that the volume fraction of secondary phases (Al2Cu, Al3Li) decreased obviously after ST. It was found that the strengthening of Al–3Li–1.5Cu–0.2Zr alloy was a balance of the precipitation strengthening, residual phase strengthening and fine grain strengthening. The residual phase strengthening and fine grain strengthening decreased with increasing the solution temperature and time, while precipitation strengthening increased. After ST at 560 °C for 40 h, the elongation of Al–3Li–1.5Cu–0.2Zr alloy reaches the highest value of 22.1%. In addition, the tensile properties are up to the highest values, ultimate tensile strength of 359 MPa and elongation of 3.5% after optimal ST at 560 °C for 40 h followed by aging treatment.

Keywords

AlLisecond phases
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 8 , 28 April 2016 , pp. 1124 - 1132
Copyright
Copyright © Materials Research Society 2016 

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