Effect of Silicon on Microstructure and Mechanical Properties of Al-Si Piston Alloys
Blesson Mathai, Prof. Cijo Mathew, Prof. Pratheesh K, Dr. Cibu K Varghese"Effect of Silicon on Microstructure and Mechanical Properties of Al-Si Piston Alloys", International Journal of Engineering Trends and Technology (IJETT), V29(6),299-303 November 2015. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Al-Si alloys are in demand for several structural devices of their high strength to weight ratio. The enhancement in properties is further observed when suitably alloyed with the different elements. Al-Si alloy find their application mostly in automobile engineering. Si in the matrix nucleates as needle structure when solidified. These needle structures when modified exhibit very mechanical and wear properties. The microstructure can be modified and mechanical properties can be improved by alloying and heat treatment. The typical alloying elements are copper, magnesium and nickel. The aim of this work was to determine the effect of Si content on the microstructure and mechanical properties of hypo eutectic, eutectic and hypereutectic Al–Si piston alloys .The alloys of different content of Si namely 4, 6, 8, 10, 14 and 16 % are produced by gravity die casting route in an electric resistance furnace. The paper also emphasises the role of heat treatment on the microstructure and hence the mechanical properties of the Al-Si piston alloy. The micro structural observations and mechanical properties namely tensile strength and hardness were investigated according to standard procedure. Ultimate tensile strength has increased with increase in silicon content. The hardness of the samples increases with the increase in silicon content. The application of heat treatment produced a finer microstructure and resulted in a uniform distribution of the intermetallic compounds and it modifies the eutectic Si phase and hence improves the mechanical properties of the alloy.
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Aluminium alloys, alloying elements, heat treatment, microstructure, tensile strength, material removal rate.