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Effect of Phase architecture on mechanical properties of interpenetrating metal/ceramic composites

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Abstract

The aim of this article is to compare the influence of the phase architecture on the mechanical properties of two interpenetrating MMCs with same metallic and ceramic phases and similar phase contents. One of the composites was fabricated by infiltrating freeze-cast alumina preforms, while the other composite was fabricated by infiltrating open porous alumina foam. Tests were carried out to determine the three longitudinal elastic constants, elastic-plastic flow behavior under compression and mechanism of internal load transfer under compression. Results show that phase morphology has a significant influence on the composite mechanical properties. Highest stiffness and compressive strengths are observed along the freezing direction in the freeze-cast MMC and this result from the significantly higher fraction of load carried by the alumina phase in this MMC type. Foam based MMC shows more isotropic behavior and its properties lie between the longitudinal and transverse properties for freeze-cast MMC.

Keywords:

  • Interpenetrating MMC
  • Freeze-casting
  • Anisotropy
  • Load transfer

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  • DOI: 10.1007/978-3-319-11340-1_8
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Acknowledgments

The authors thank T. Waschkies, R. Oberacker and M. J. Hoffmann at IAM-KM, Karlsruhe Institute of Technology for fabricating the freeze-cast preforms. Financial support from German Research Foundation (DFG) under grant number RO 4164/1-1 is thankfully acknowledged.

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© 2014 Springer International Publishing Switzerland

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Roy, S., Gibmeier, J., Weidenmann, K.A., Nagel, A., Wanner, A. (2014). Effect of Phase architecture on mechanical properties of interpenetrating metal/ceramic composites. In: Udomkichdecha, W., Böllinghaus, T., Manonukul, A., Lexow, J. (eds) Materials Challenges and Testing for Manufacturing, Mobility, Biomedical Applications and Climate. Springer, Cham. https://doi.org/10.1007/978-3-319-11340-1_8

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