| About this Abstract |
| Meeting |
Materials Science & Technology 2020
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| Symposium
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Ceramic Matrix Composites
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| Presentation Title |
Processing and Characterization of Al /Al2O3 Metal Matrix Composites Produced Using Magnetic Field-Assisted Freeze Casting of Porous Ceramic Structures
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| Author(s) |
Said Bakkar, Jihyung Lee, Nicholas Ku, Diana Berman, Samir M. Aouadi, Raymond E Brennan, Marcus L. Young |
| On-Site Speaker (Planned) |
Said Bakkar |
| Abstract Scope |
In this study, Al/Al2O3 Metal Matrix Composites (MMCs) were produced by metal infiltration of porous ceramic preforms. The porous ceramic preforms were fabricated using the magnetic freeze-casting method, resulting in vertically-aligned porous channels. Preforms were prepared by freezing Al2O3/tert-butyl alcohol (TBA)/polyvinyl alcohol (PVA)/Fe3O4 slurry under an applied vertical magnetic field of 0.3 T. The formed ceramic preforms contained porous channels of 80-100 μm diameter and a total porosity volume fraction of 78.2%, as determined from scanning electron microscopy (SEM) micrographs and ImageJ software. The sintered ceramic preforms were then infiltrated with molten A356 Al-based alloy using the suction pump-assisted infiltration. Mechanical properties of the resulting Al2O3/A356 MMCs were compared to those of the bulk Al2O3, bulk Al-based alloy (A356), and porous Al2O3 preform using micro-indentation testing. The indentation hardness and elastic modulus values of Al2O3/A356 MMCs were found to be in good agreement with experimental and theoretical calculations. |