Processing of Aluminum-Graphite Particulate Metal Matrix Composites by Advanced Shear Technology |
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Authors: | N Barekar S Tzamtzis B K Dhindaw J Patel N Hari Babu Z Fan |
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Affiliation: | (1) Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, 721302, India;(2) BCAST (Brunel Centre for Advanced Solidification Technology), Brunel University, Uxbridge, Middlesex, UB8 3PH, UK; |
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Abstract: | To extend the possibilities of using aluminum/graphite composites as structural materials, a novel process is developed. The
conventional methods often produce agglomerated structures exhibiting lower strength and ductility. To overcome the cohesive
force of the agglomerates, a melt conditioned high-pressure die casting (MC-HPDC) process innovatively adapts the well-established,
high-shear dispersive mixing action of a twin screw mechanism. The distribution of particles and properties of composites
are quantitatively evaluated. The adopted rheo process significantly improved the distribution of the reinforcement in the
matrix with a strong interfacial bond between the two. A good combination of improved ultimate tensile strength (UTS) and
tensile elongation (ε) is obtained compared with composites produced by conventional processes. |
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