Contribution of matrix plasticity to the `frictional' sliding of debonded fibers in sapphire-reinforced TiAl matrix composites

J. M. Galbraith, D. A. Koss, J. R. Hellmann

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Abstract

Large-scale fiber displacement behavior, usually characterized by a `frictional' sliding stress (τslide), has been studied in two sapphire-reinforced TiAl systems. Experimental results from fiber pushout and reverse push-back tests indicate that the large-scale sliding behavior of debonded fibers leads to an average τslide-value which progressively decreases during fiber displacements. Previous studies of SCS-6 (SiC) fiber-reinforced glass and metal matrix composites have attributed decreases in τslide to the fracture and wear of fiber asperities. However, given a matrix in which fiber asperities do not easily wear (e.g., a TiAl alloy), SEM examination of the fiber/matrix interface indicates that matrix plasticity plays a dominant role in the decrease of τslide with fiber displacement. Experimental evidence suggests that the observed decrease in τslide can be attributed to (1) a decrease in fiber roughness perceived by the matrix due to matrix grooving and (2) a relaxation of radial clamping as a result of material removal from the interface.

Original languageEnglish (US)
Pages (from-to)143-151
Number of pages9
JournalMaterials Research Society Symposium - Proceedings
Volume350
StatePublished - Dec 1 1994
EventProceedings of the MRS Symposium - San Francisco, CA, USA
Duration: Apr 4 1994Apr 6 1994

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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