UCTEA Chamber of Metallurgical & Materials Engineers’s Training Center Proceedings Book 1198 IMMC 2018 | 19 th International Metallurgy & Materials Congress Aluminum Matrixed Graphen Reinforced Composite Materials Okan Aydın, Aziz Kocaveli, Özen Gürsoy, Eray Erzi, Derya Dışpınar Istanbul University, Faculty of Engineering, Metallurgical and Materials Engineering Department, 34320, Avcılar, Istanbul, TURKEY SUMMARY In this study, due to the high strength property of the graphene, it is aimed to make metal matrix composite by placing the matrix in aluminum. During metal matrix composite casting, graphene reinforced aluminum matrix composite castings were investigated by using lost foam cast process, squeeze casting method, sand mold casting, gravity die casting methods. In these studies, the post- production mechanical test results of graphene powders placed in matrix aluminum were evaluated on a wide scale and the increase in strength values was observed. 1. Introduction The composite term is broadly defined as "Composite Material" where materials in the same or different groups of two or more materials are assembled at the macro level to combine the best features together or to create a new feature. In other words, to obtain superior qualities by correcting the weakness of each other, it can be called as material consisting of different kinds of materials combined with the aim[1]. Aluminum is an element in the group IIIA of the Periodic Table with an atomic number of 13,+3 valence with an atomic weight of 26.89, a density of 2,7 gr/cm3 at 20°C, a melting point of 659.8°C and a boiling point of 2450°C[2]. Aluminum alloys are copper, zinc, silicon, magnesium, manganese, iron, nickel, titanium and like elements. Features; they must be lightweight, heat and electrical conductivity, suitable for heat treatments, and resistant to certain chemical effects. Aluminum alloys are suitable for casting. At the same time, aluminum alloys which are formed by forging, drawing and rolling are also prepared. They are resistant to corrosion and are used as preservatives in drug and vegetable gardens because they do not create a toxic hazard[3]. Graphene is the name given to a single layer of graphite, an allotropy of carbon element capable of hybridizing sp, sp2, and sp3. It was first introduced in 1994 by Boehm, Setton and Stumpp[4]. Table 1. General Properties of Single Layer Grafen[4] Properties Value Hybrid Shape sp 2 Number of Layers Monolayer Crystal Structure Hexagonal Dimension Two Degree of Purity (%) 99 Mass (Bulk) Density (g/cm 3 ) ~0.3 True Density (g/cm 3 ) 2.25 Thickness (nm) ~1-2 Surface Area (m 2 /g) 2600 High Temperature Resistance -75 +200 0 C there features do not change between. Thermal Conductivity (WK -1 /m) 4840-5300 Electro Mobility [cm 2 /(V.s)] ~2.5x105 Elastic Modulus (Tpa) ~1 2. Experimental The castings were begun by lost foam cast process. In the first casting, graphene was put between 3 same foam plates with dimensions of 10x10x30. The aluminum melted in the resistance furnace at 750 °C for 2 hours was cast into the sand. EDS analyzes were performed in scanning electron microscopy (SEM) after metallography and ultrasonic cleaning. After graphene powder was placed between the foam layers, the cube foam was carved inside the dimensions of 20x20x20. The cavity was filled with powder graphene, and the foam was buried in the sand. In the resistance furnace, aluminum was melted at 750°C for 2 hours and then cast into cubic foam in the sand. SEM analysis was performed after waiting 10 minutes for the cold.