Recycle of aluminium (A356) for processing of new composites reinforced with magnetic nano iron oxide and molybdenum

Document Type

Conference Proceeding

Publication Date

11-5-2016

Department

Department of Mechanical Engineering-Engineering Mechanics

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 % of Fe3O4 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.

Publication Title

Conference Proceedings of the Society for Experimental Mechanics Series

ISBN

978-3-319-41765-3

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