Chapter 18 Recycle of Aluminium (A356) for Processing of New Composites Reinforced with Magnetic Nano Iron Oxide and Molybdenum L.F.P. Ferreira, E. Bayraktar, I. Miskioglu, and M.H. Robert Abstract The microstructural and tribological behavior of Aluminium Matrix Composites (AMCs with scrap A356) reinforced with nano iron oxide (Fe3O4) and Molybdenum (Mo) produced by powder metallurgy was investigated with low cost manufacturing of light and efficient multifunctional materials for aeronautical applications. Molybdenum (Mo) is a refractory material with a high melting temperature and used essentially as high-temperature resistant materials for applications in the fields of aerospace engineering such as rocket nozzles, high-temperature resistant pieces, etc. It shows a low thermal expansion coefficient, excellent electrical conductivity and higher corrosion resistance. However, it becomes very brittle after recrystallization. Generally, AMCs reinforced with magnetic iron (Fe3O4) exhibit good physical (electrical and magnetic) properties, which make them excellent multifunctional lightweight materials. Normally, they do not present high wear resistance. To overcome this shortcoming, very fine Mo (1–3 μm) powders was added to the AMCs. The main purpose of this work is to show the influence of molybdenum on the AMCs reinforced by 10 %ofFe3O4 to increase wear resistance of these novel composites. Matrix/reinforcement interface was also evaluated due to addition of Mo to the matrix. Two groups of composites were prepared: First group contains only Fe3O4, Cu and Mo. Second group contains Fe3O4 doped with TiO2 (thermomechanical treatment), Cu and Mo. For processing, a novel combined method of sintering + forging was performed. Experimental results have revealed that even small additions of Mo can drastically improve wear performance of AMCs reinforced with magnetic iron (Fe3O4). Morphology of the composites was evaluated by Scanning Electron Microscopy (SEM). Scratch tests were conducted to evaluate wear properties. Keywords Recycled materials • Aluminium matrix composites • Magnetic iron oxide • Damage analysis • Molybdenum 18.1 Introduction Aluminium Matrix Composites (AMCs with scrap A356) reinforced with nano iron oxide (Fe3O4) and Molybdenum (Mo) produced by powder metallurgy was investigated with low cost manufacturing of light and efficient multifunctional materials for aeronautical applications. AMCs reinforced with particles tend to offer enhancement of properties processed by different. In the last few decades, high performance AMCs have been widely developed with high strength, high stiffness, low density, and good wear resistance capacity [1–5]. Among them, A356 aluminium is widely used as matrix. A356 is an interesting option for military and automobile applications as the alloy has important properties of high strength, light weight and good capacity for foundry (fluidity). This alloy can also be successfully used as matrix from recycled fresh scrap (chips) to produce high quality metal matrix composites in an economic way [6–11]. Molybdenum was chosen as a basic reinforcement to the AMCs structures reinforced with magnetic iron oxide to increase wear resistance of these composites [7–13]. L.F.P. Ferreira Materials Science Department, UNICAMP-University of Campinas, Sa˜o Paulo, Brazil School of Mechanical and Manufacturing Engineering materials science department-composite lab, Supmeca-Paris, 93407- St Ouen, France E. Bayraktar (*) School of Mechanical and Manufacturing Engineering materials science department-composite lab, Supmeca-Paris, 93407- St Ouen, France e-mail: bayraktar@supmeca.fr I. Miskioglu ME-EM Department, Michigan Technological University, Houghton, MI 49931, USA M.H. Robert Materials Science Department, UNICAMP-University of Campinas, Sa˜o Paulo, Brazil #The Society for Experimental Mechanics, Inc. 2017 W.C. Ralph et al. (eds.), Mechanics of Composite and Multi-functional Materials, Volume 7, Conference Proceedings of the Society for Experimental Mechanics Series, DOI 10.1007/978-3-319-41766-0_18 153
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