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    PROCESSING AND CHARACTERISATION OF FUNCTIONALLY GRADED MATERIALS BASED ON FEW-LAYERED GRAPHENE REINFORCED ALUMINUM
    (Tanger Ltd, 2022) Ozturk, Ozberk; Borand, Gokce; Uzunsoy, Deniz
    Functionally graded materials (FGMs) are advanced engineering materials developed due to their superior properties where traditional composite materials are not sufficient. Nowadays, the development and application of these materials for the potential areas have attracted much more attention. Aluminum (Al) is preferred for physical and mechanical properties such as lightweight, high specific strength, high specific modulus, and low thermal expansion coefficient in these potential applications. Graphene attracts great attention worldwide due to its superior mechanical, electrical and thermal properties. In the current study, few-layered graphene (FLG) produced with high purity electric arc discharge method were used to reinforce the Al matrix using various (in wt%) of 0, 0.1, 0.2, 0.3, 0.5, and 0.7 FLG by mechanically alloying (MA). Composite powders were consolidated by cold pressing with a layer by layer under 450 MPa. Al-FGM composites were designed including six layers and they were subjected to sintering at approximately 590 degrees C under argon atmosphere. The microstructure of Al-FGM was investigated by optical microscopy and scanning electron microscopy (SEM). It was observed that the FLG placed between the grains and acts as a barrier through the gradation improving the mechanical properties of the Al-FGM. Hardness value of the layer with the highest graphene content was measured as 113 HV. An increase in the Vickers hardness by 18 % was observed in the last layer with FLG content of 0.7 wt% compared to the first layer.
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    PRODUCTION OF Al-5Cu ALLOY COMPOSITES REINFORCED WITH FEW-LAYERED GRAPHENE BY POWDER METALLURGY METHOD
    (Tanger Ltd, 2022) Borand, Gokce; Ozturk, Ozberk; Aydin, Hursit Sefa; Uzunsoy, Deniz
    Aluminum based alloys have been widely used in the automotive, aircraft and defense applications because of good thermal and electrical conductivity, high tensile strength-to-weight ratio, high hardness, and ductility properties. Graphene, is an allotrope of carbon, attracts great attention worldwide due to its sp2-hybridized two-dimensional honeycomb structure, low weight, thermal, electrical, and mechanical properties. In the present study, high purity few- layered graphene (FLG) which was synthesized via electric arc discharge method (EAD) were reinforced to the Al-5Cu alloy matrix using various weight fraction of 0, 0.1, 0.3, and 0.5, by mechanically alloying (MA). These nano-composite powders were consolidated by cold pressing under 450 MPa and they were subjected to sintering at 570 degrees C and 580 degrees C for 3 hours under argon atmosphere. The microstructure of composites materials was studied by optical microscope and scanning electron microscopy. The FLG was observed to be dispersed homogeneously in the Al-5Cu alloy matrix. An increase in the micro hardness for Al- 5Cu alloy with 0.5 wt% FLG (123 HV) by 45 % was observed compared to pure Al-5Cu alloy (85 HV) sintered at 570 degrees C. Moreover, wear properties of these composite materials were investigated by means and analysis of variance (ANOVA).