Design of Hybrid Composites from Scrap Aluminum Bronze Chips
Aluminum bronze material has high thermal conductivity, wear resistance, corrosion resistance, and good mechanical strength which is widely used in structural applications, grinding tools, etc. Certain studies have shown that these composites containing a
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Design of Hybrid Composites from Scrap Aluminum Bronze Chips L.F.P. Ferreira, E. Bayraktar, I. Miskioglu, and D. Katundi
Abstract Aluminum bronze material has high thermal conductivity, wear resistance, corrosion resistance, and good mechanical strength which is widely used in structural applications, grinding tools, etc. Certain studies have shown that these composites containing a small amount of iron and nickel exhibit improved bending strength and higher strain energy. The main purpose of the present work is to apply the liquid phase sintering process to determine the optimal sintering conditions and to evaluate the interface of aluminum and the scrap aluminum bronze chips with different reinforcement elements (TiC, BN, Gr etc.). A second aspect of this work is to evaluate the effect of the sintering conditions on the microstructure and mechanical properties such as hardness and compression behavior. In the frame of the present work, an original idea of producing a hybrid composite has been developed by using scrap aluminum bronze chips. This consists of mixing and compacting aluminum with aluminum bronze (ASTM B148) chips through press moulding and sintering. Keywords Recycled aluminum bronze • Hybrid materials • Liquid phase sintering • Mechanical properties
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Introduction
Aluminum bronzes consist of very different kind of compositions with a wide range of properties for industrial applications due to high thermal conductivity, wear resistance, corrosion resistance, and good mechanical strength, etc. The hardness of aluminum bronzes increases with aluminum content as well as with stresses caused through cold working. Certain numbers of manganese and nickel aluminate bronzes exhibit a quasi-similar martensitic transformation that could increase mechanical properties, evidently, there are other mechanisms that increase strength but they are not generally thought of as primary strengthening mechanisms. Generally, these alloys are ductile as the result of short cooling cycle during annealing. They show quasi pure metal solidification behavior [1–5]. Aluminum bronzes are used for replacing other expensive materials in marine applications, hardware and its equipment and recently they are being used more and more in aeronautical, automotive and railway engineering applications. Another real question in manufacturing engineering is recycling of the scraps resulting from production depending on their quality and the cost of the recycling process (clean, less number of inclusions, etc.). Among the available methods, very economical production of recycled metal matrix composites (MMCs) is achieved by classical powder metallurgy sintering, thixoforming, etc. [6–11]. Essentially, thixoforming or sintered forging give composites much more advantages such as virtually porous free end product, very good interface between the reinforcements and the matrix, homogeneous distribution of the particles in the matrix and improved mechanical properties [6, 7]. The present work proposes low cost of manufacturing of a novel hyb
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