International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
Experimental Investigation on Mechanical Behavior’s of Stir Cast Aluminium 6061-SiC MMC using Taguchi Technique C . Manikandan Assistant Professor, Dept of Mechanical Engineering, CMS College of Engineering and Technology, Coimbatore-641 032,Tamilnadu. ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - The metal matrix composites are mostly used in
aerospace applications and in automobile sectors due to its light weight to strength ratio. Aluminium 6061 has been used as matrix and SiC as reinforcement. A liquid metallurgy route of stir casting technique was adapted to prepare cast composites .Taguchi method orthogonal array of L9 33 is used to design experiments. The weight fraction of SiC 6%, 9% and 12%, stirrer speed of 200 rpm, 250 rpm, and 300 rpm and reinforcement preheating temperature of 450°C, 475°C and 500°C are used. Tensile test, hardness test and impact tests were conducted on the specimens. The ultimate strength, tensile strength and yield strength are appeared in maximum level of 6% of SiC . The hardness improvement and impact values are appreciable in 12% of SiC.
Key Words:
Metal Matrix Composite, Stir Casting, Toughness, Tensile Test, Yield strength, Hardness
1.INTRODUCTION Present days with the modern development need of advanced engineering materials for various engineering applications. To meet such demands metal matrix composite is one of the reliable source, among the several categorization, aluminum based composite are used in spread acceptance especially in application where weight and strength are of prime concern. Mostly Al 6061 has been preferred in the automobile industries for the production of different types of automobile components. Rajeswari et al [1] have concluded that the hardness of the Al7075 composite material was increased with the addition of 2.5% and 7.5% SiC. The stir casting method maintains the uniform distribution of Al 7075 alloy with SiC/Al2O3 reinforced composites in clearly superior form to the base of Al alloy. Dispersion of SiC /Al2O3 particles in Al 7075 matrix improves the micro hardness of the matrix material. Rajeswari, et al [2] noticed that the most significant parameters of 12% weight of reinforcement, 550 rpm stirring speed and 800°C influences the mechanical properties of A7075- SiC-Al2O3 hybrid MMC. At high temperatures, the wettability of the reinforcements is enhanced considerably thereby ensuring homogenous mixing. Gyanendra Singh et al [3] stated that the aluminum composite material having good mechanical properties while increasing the percentage of magnesium. Strength and © 2017, IRJET
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Impact Factor value: 5.181
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ductility are increased at less than 2.7% Cu along with Mg and Zn contents in aluminum matrix as in case of alloy. Siddanna Awarasan et al [4] indicated that the LM25 Al alloy and steel wire not shows any defects on its boundary area of the part. The composite impact strength increased about 45 % compared to LM25 Al of impact strength . Najib Souissi et al [5] stated Taguchi method reduces the number of experiments for the observation. The optimal state of ductility of 2017A wrought Al alloy was influenced with the contribution of squeeze pressure, melt temperature, and die preheating temperature to the quality characteristic (ductility) is 83.75, 10.26, and 5.71 %, respectively. It is noted that squeeze pressure is the major contributing factor and present a significant influence on the microstructure of the alloy. Saravanakumar et al [6] showed squeeze casting has the potential to obliterate the defects like porosity and shrinkage due to the pressurization on the molten melt. Researchers were identified the squeeze pressure range 40-150 MPa, 650-800° C of melt temperature and 150-300° C of die temperature as the optimal parameters for the production of sound castings. S.R.Durairaju,et al [7] proved the tensile strength, hardness, compressive strength of the piston is being improved in squeeze die casting process. The grain structure of the piston manufactured by centrifugal casting process is improved up to 78% when compared to piston manufactured by squeeze die casting process. The porosity formed during casting process is reduced up to 90%.The fluidity property of aluminium LM6 is improved at 750°C temperature. Along with heat treatment process the aluminium alloy gains a greater value of hardness. S. Venkat Prasat, et al [8] noticed from the various studies , that the tensile and hardness properties increased with increasing of AL203 weight percentage and also inferred that wettability is inversely proportional to the weight of reinforcement. 2% of SiC only influences the tensile strength of Al MMC. Md.Azhar Farooq Maniyar et al[9] studied the stir casting methodology effect on microstructure and tribological characteristics of LM25/SiC/Mica hybrid composites . In Al/SiC/Mica that Silicon Carbide produced good results on
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