Investigation on the Microstructure and Mechanical Properties of New Al-Si Piston Alloys


Article Preview

Dense precipitation of various intermetallic compounds is a common feature in the microstructure of Al-Si piston alloys. In this investigation, microstructure of LM13 alloy and three high Cu-containing Al-Si piston alloys with different amounts of Ni, Fe, and Mn were studied by means of optical microscopy (OM) and scanning electron microscopy (SEM). Chemical composition of the phases was determined by using energy dispersive X-ray analysis (EDX). The precipitation of the phases was studied through thermal analysis of the solidifying samples. Also, tensile properties and hardness of the samples were measured. The results showed that the various intermetallics such as Al12(FeMn)3Si2, Al3Ni, Al9FeNi, and Al3CuNi precipitated during the solidification. The high Cu-containing alloy with optimum levels of Ni (1.8 wt.%), Fe (0.75 wt.%), and Mn (0.3 wt.%) has the highest tensile strength (250 MPa) and hardness (110 BHN) among the other alloys.



Edited by:

Faruk Yigit and Mohammed S. J. Hashmi




S.G. Shabestari and R. Gholizadeh, "Investigation on the Microstructure and Mechanical Properties of New Al-Si Piston Alloys", Advanced Materials Research, Vol. 445, pp. 289-294, 2012

Online since:

January 2012




[1] H. Yamagata, in: The Science and Technology of Materials in Automotive Engines, Woodhead Publishing, Cambridge (2005).

[2] N.A. Belov, A.A. Aksenov and D.G. Eskin, in: Iron in Aluminum Alloys: Impurity and Alloying Element, Taylor & Francis, London, (2002).

[3] Z. Qian, X. Liu, D. Zhao and G. Zhang: Mater. Lett. Vol. 62 (2008), p.2146–49.

[4] Y. Komiyama: Journal of Japan Institute of Light Metals Vol. 28 (1978), pp.377-82.

[5] C. -L. Chen and R.C. Thomson: J. Alloys Compd. Vol. 490 (2009), pp.293-300.

[6] C. -L. Chen, A. Richter and R.C. Thomson: Intermetallics Vol. 17 (2009), pp.634-41.

[7] N.A. Belov, D.G. Eskin and N.N. Avxentieva: Acta Mater. Vol. 53 (2005), pp.4709-22.

[8] N.A. Belov, D.G. Eskin and A.A. Aksenov, in: Multicomponent Phase Diagrams: Applications for Commercial Aluminum Alloys, Elsevier Ltd. (2005).

[9] T.O. Mbuya, B.O. Odera and S.P. Nganga: Int. J. Cast Met. Res. Vol. 16 (2003), pp.451-65.

[10] P.N. Crepeau: AFS Trans. Vol. 103 (1995), pp.361-6.

[11] L.F. Mondolfo, in: Manganese in Aluminium Alloys, Manganese Center, Paris, (1978).

[12] D.A. Granger: AFS Trans. Vol. 99 (1991), pp.379-83.

[13] A.N. Lakshmanan, S.G. Shabestari and J.E. Gruzleski: Z. Metallkd. Vol. 86 (1995), pp.457-64.

[14] S.G. Shabestari: Mater. Sci. Eng. A Vol. 383 (2004), pp.289-98.