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Journal of Materials Science

, Volume 34, Issue 22, pp 5557–5567 | Cite as

Microstructural nature of strengthening and toughening in Al2O3-SiC(p) nanocomposites

  • C. C. Anya
Article

Abstract

It is demonstrated that neither of the theories based on flaw size, surface flaw healing or residual stress adequately and consistently explain the strengthening and toughening phenomena in Alumina-SiC nanocomposites. SiC presence reduces the amount of amorphous (glassy) silica rich phase (SRP) in the nanocomposite relative to that found in monolithic Alumina and to a level that the effect of SRP is negligible. The reduction of SRP and the multipliable effect of microstructural features such as dislocations, crack/particle interactions and cleavage steps, observed in these materials at an extraordinarily small scale (due to the nano-size of the SiC particles), are suggested to be more consistent in explaining these phenomena. Owing to the nano-scale at which these features operate, which is far below the practical resolution limit of the Scanning Acoustic Microscope (SAM), it is also argued that the latter may not be a good method for studying these materials.

Keywords

Polymer Alumina Residual Stress Good Method Surface Flaw 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • C. C. Anya
    • 1
  1. 1.Kidlington, OxfordUnited Kingdom

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