Influence of heat treatment on the microstructures and mechanical properties of squeeze cast AlSi₉Cu₃ alloys
by Henda Barhoumi; Slim Souissi; Mohamed Ben Amar; Foued Elhalouani
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 10, No. 5/6, 2015

Abstract: The AlSi₉Cu₃ alloy was prepared by gravity die casting and squeeze casting. This alloy has a good castability, excellent machinability, medium strength and low specific weight. Various test techniques, including optical microscopy, scanning electron microscope, X-ray diffraction, tensile test and hardness were used to examine the effect of pressure levels and T6 heat treatment on the microstructure and mechanical properties of Al₉Si₃Cu alloy produced by gravity and squeeze casting process. The experimental results showed that this alloy contained α-matrix, eutectic silicon and other Fe- and Cu-rich phases with different morphology. Furthermore, the applied pressure refines the microstructure, improves the tensile properties and increases the hardness Vickers. It was found that a T6 heat treatment was applied, spheroidised eutectic Si particles and fragmented β-phase particles were formed and the mechanical properties were improved.

Online publication date: Sun, 28-Feb-2016

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