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An investigation of the effects of secondary processing on the fracture properties of a SiCp-6XXX Al composite

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Author
Quiles, Frank N.
Date
1996-06
Advisor
Dutta, Indranath
Wells, Joe
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Abstract
Discontinuous reinforced aluminum (DRA) composites are attractive as structural materials because of their desirable stiffness and strength to weight ratios and relative ease of manufacture. However, they typically display low tensile ductility and fracture toughness. In this work, the impact of post- fabrication deformation processing and heat treatment on the fracture properties of a 17.5 vol. % SiCsubp reinforced Al 6092 matrix composite is investigated. Process temperature, total strain and strain rate during extrusion were varied in order to explore the feasibility of obtaining Particle Stimulated Nucleation (PSN) of recrystallization during processing, with the goal of refining the matrix grain size. Additionally, various combinations of solution and aging treatments were investigated with the aim of obtaining a number of stable matrix microstructural conditions with varying levels of composite strength and fracture toughness. A preliminary investigation of fracture mechanisms and their dependence on the matrix aging state has also been carried out using optical and scanning electron microscopy (SEM) and differential scanning calorimetry (DSC), and is reported here.
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http://hdl.handle.net/10945/8577
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    Optimization of the Strength-Fracture Toughness Relation in Particulate-Reinforced Aluminum Composites via Control of the Matrix Microstructure 

    Dutta, I.; Quiles, F.N.; McNelley, T.R.; Nagarajan, R. (1998-09);
    The evolution of the microstructure and mechanical properties of a 17.5 vol. pct SiC particulatereinforced aluminum alloy 6092-matrix composite has been studied as a function of postfabrication processing and heat ...
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    Study of the progressive failure of composites under axial loading with varying strain rates 

    Boey, Yew Khuan (Monterey, California. Naval Postgraduate School, 2011-12);
    This study investigated the progressive damage/failure of composite panels with open circular holes under progressive axial loading. A series of experiments was carried out to determine the failure in laminated specimens ...
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    The role of particle cracking in dilatation during tensile straining of a cast and thermomechanically processed 6061 Al - 20 volume percent Al2O3 metal matrix composite 

    Boyle, Kevin P. (Monterey, California. Naval Postgraduate School, 1996-09);
    In this work, the dilatation during tensile straining of a cast and thermomechanically processed 6061 Al - Al2O3 metal matrix composite (MMC) containing 20 volume percent of Al2O3 particles was examined. Standard tensile ...
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