Investigations on the structure and properties of hot extruded aluminium sicp composites

Abstract

Metal matrix composites (MMCs) play an important role in the newlineautomotive, aerospace and defence sectors to meet the increasing demand of newlineminimising weight without compromising the performance. MMCs are a class newlineof materials, which have potential for a wide variety of structural and newlinedynamic applications. MMCs have been developed to meet the needs for newlinelighter materials with high specific strength, specific stiffness and wear newlineresistance. Among the various MMCs, the Aluminium Matrix Composites newline(AMCs), reinforced with discontinuous reinforcements are found to be more newlineattractive because they not only exhibit excellent combination of strength, newlineductility and toughness, but also have proven versatility to be manufactured newlinethrough conventional metal forming methods. As a result, AMCs are newlineincreasingly sought for weight critical and high-performance applications in newlinevarious industries. There are many methods available for the fabrication of newlinealuminium alloy composites, such as stir casting, powder metallurgy, newlineinfiltration techniques and so on, of which the foundry based processes like newlinestir casting, squeeze casting are promising in the production of near net shape newlinecomponents at high production rate and at low cost. Application of secondary newlineprocessing techniques such as extrusion, forging, rolling on MMCs is a recent newlineattempt by the researchers. The secondary processing of particle reinforced newlinecomposites offers substantial benefits such as removal of defect, improvement newlinein distribution of particles and thereby enhances their properties. However, to newlineobtain high quality extrudate with improved properties, the extrusion process newlineparameters need to be optimized. newline newline