Effect of Mg and Cu Additions on Microstructure and Mechanical Properties of Squeeze Casting Al-Si-Cu-Mg Alloy

Abstract:

The effects of Mg and Cu additions with different contents on the mechanical properties of Al-Si alloy prepared by indirect squeeze casting have been experimentally investigated. The microstructure and mechanical properties of as-cast and T6-treated Al-Si-Cu-Mg alloys were tested by OM, SEM, DSC and tensile measurement, where the samples were produced by artificial aging at 180°C for 8 h after solution treatment at 540°C for 4 h. It has been found that for the as-cast alloys, with increasing contents of Mg and Cu the tensile strength (UTS) and yield strength (YS) increased, while the percentage elongation (El) decreased. And the optimal mechanical properties of Al-Si-Cu-Mg alloys were obtained under the content ratio of Cu/Mg within 4, where the UTS and El reached 426 MPa and 6.3% after T6 treated, respectively.

• Periodical: Materials Science Forum (Volume 850)
• Pages: 511-518
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.850.511
• Online since: March 2016
• Authors: Hai Jun Liu, Lie Jun Li, Jian Wei Niu, Ji Xiang Gao, Chuan Dong Ren
• Keywords: Al-Si-Cu-Mg Alloy, Heat Treatment, Mechanical Properties, Squeeze Casting

References

[1] S. Hegde, K.N. Prabhu, Modification of eutectic silicon in Al-Si alloys, Journal of Materials Science. 50(2008) 3009-3027.

DOI: 10.1007/s10853-008-2505-5

[2] M.T. Abou El-khair, Microstructure characterization and tensile properties of squeeze-cast AlSiMg alloys, Materials Letters. 59(2005) 894-900.

DOI: 10.1016/j.matlet.2004.11.041

[3] Y.F. Bai, H.D. Zhao, Tensile properties and fracture behavior of partial squeeze added slow shot die-cast A356 aluminum alloy, Materials & Design. 31(2010) 4237-4243.

DOI: 10.1016/j.matdes.2010.04.005

[4] P. Ouellet, F.H. Samuel, Effect of Mg on the ageing behaviour of Al-Si-Cu 319 type aluminum casting alloys, Journal of Material Science. 34(1999) 4671-4697.

[5] M.S. Salleh, M.Z. Omar, J. Syarif, The effects of Mg addition on the microstructure and mechanical properties of thixoformed Al-5%Si-Cu alloys, Journal of Alloys and Compounds. 621(2015) 121-130.

DOI: 10.1016/j.jallcom.2014.09.152

[6] R. X. Li, R.D. Li, Y.H. Zhao, Age-hardening behavior of cast Al-Si base alloy, Mater Letter. 15(2004) 2096-2101.

DOI: 10.1016/j.matlet.2003.12.027

[7] A.M.A. Mohamed, F.H. Samuel, S. Al Kahtani, Influence of Mg and solution heat treatment on the occurrence of incipient melting in Al-Si-Cu-Mg cast alloys, Materials Science and Engineering: A. 543(2012) 22-34.

DOI: 10.1016/j.msea.2012.02.032

[8] M. Zeren, Effect of copper and silicon content on mechanical properties in Al-Cu-Si-Mg alloys, Journal of Materials Processing Technology. 169(2005) 292-298.

DOI: 10.1016/j.jmatprotec.2005.03.009

[9] I. Aguilera-Luna, M.J. Castro-Román, J.C. Escobedo-Bocardo, Effect of cooling rate and Mg content on the Al-Si eutectic for Al-Si-Cu-Mg alloys, Materials Characterization. 95(2014) 211-218.

DOI: 10.1016/j.matchar.2014.06.009

[10] Y. Zedan, A.M. Samuel, F.H. Samuel, S. Alkahtani, Effects of Cu, Mg and Sr Addition on the Mechanical Properties and Machinability of Near-Eutectic Al-11%Si Casting Alloys, Light Metals. 2012 321-326.

DOI: 10.1007/978-3-319-48179-1_54

[11] G.Q. Wang, X.F. Bian, W.M. Wang, J.Y. Zhang, Influence of Cu and minor elements on solution treatment of Al-Si-Cu-Mg cast alloys, Materials Letters. 57(2003) 4083-4087.

DOI: 10.1016/s0167-577x(03)00270-2

[12] C.H. Liu, X.M. Zhang, J.G. Tang, X.X. Liu, L. Chen, Effect of copper on precipitation and baking hardening behavior of Al-Mg-Si alloys, Transactions of Nonferrous Metals Society of China. 24(2014) 2289-2294.

DOI: 10.1016/s1003-6326(14)63346-x

[13] M.P. Liu, Z.J. Wu, R. Yang, J.T. Wei, Y.D. Yu, DSC analyses of static and dynamic precipitation of an Al-Mg-Si-Cu aluminum alloy, Progress in Natural Science: Materials International. 25(2015) 153-158.

DOI: 10.1016/j.pnsc.2015.02.004

[14] H.G. Kang, Age-hardening characteristics of Al-Si-Cu-base cast alloy, AFS Trans. 27(1999) 507-514.

[15] S.P. Ringer, K. Hono, Microstructural evolution and age hardening in aluminum alloys: Atom probe field-ion microscopy and transmission electron microscopy studies, Materials Characterization. 44(2000) 101-131.

DOI: 10.1016/s1044-5803(99)00051-0

[16] S. Shivkumar, S. Ricci Jr, B. Steenhoff, An experimental study to optimize the heat treatment of A356 alloy, AFS Trans. 97(1989) 791-810.