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Properties of High Volume Fraction Fly Ash/Al Alloy Composites Produced by Infiltration Process

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Abstract

In the present study, pressure infiltration is employed to synthesize aluminum alloy 7075-fly ash composites. The microstructure and chemical composition of the fly ash and the produced composite material was examined using optical and scanning electron microscopy, as well as x-ray diffraction. Several properties of the produced composite material were examined and evaluated including macro-hardness, wear, thermal expansion, and corrosion behavior. The wear characteristics of the composite, in the as-cast conditions, were studied by dry sliding wear tests. The corrosion behavior of composite material was evaluated by means of potentiodynamic corrosion experiments in a 3.5 wt.% NaCl solution. The composite specimens exhibit a homogeneous distribution of fly ash particles and present enhanced hardness values, compared to the matrix material. The high volume fraction of the fly ash reinforcement (>40%) in the composite material led to increased wear rates, attributed to the fragmentation of the fly ash particles. However, the presence of fly ash particles in the Al alloy matrix considerably decreased the coefficiency of thermal expansion, while resulting in an altered corrosion mechanism of the composite material with respect to the matrix alloy.

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Authors and Affiliations

  1. Physical Metallurgy Laboratory, Department of Mechanical Engineering, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece

    D. T. Kountouras, F. Stergioudi, A. Tsouknidas, C. A. Vogiatzis & S. M. Skolianos

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  1. D. T. Kountouras
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  2. F. Stergioudi
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  3. A. Tsouknidas
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  4. C. A. Vogiatzis
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  5. S. M. Skolianos
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Correspondence to S. M. Skolianos.

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Kountouras, D.T., Stergioudi, F., Tsouknidas, A. et al. Properties of High Volume Fraction Fly Ash/Al Alloy Composites Produced by Infiltration Process. J. of Materi Eng and Perform 24, 3315–3322 (2015). https://doi.org/10.1007/s11665-015-1612-0

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  • DOI: https://doi.org/10.1007/s11665-015-1612-0

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