Journal of Materials Science

, Volume 29, Issue 15, pp 3949–3954 | Cite as

Effect of grain morphology and grain size on the mechanical properties of Al2O3 ceramics

  • Takashi Koyama
  • Akio Nishiyama
  • Koichi Niihara


Bending strength, fracture toughness, fracture energy and crack extension resistance were evaluated for Al2O3 ceramics with equi-axed and platelet grains. Bending strength was proportional to grain size−1/2, but flaws with a size of 10 μm controlled the strength when the microstructure was finer than 10 μm. Fracture toughness, measured by the single etched precracked beam (SERB) method, was proportional to fracture energy1/2, and increased with the grain size of Al2O3 ceramics with equi-axed and platelet grains. However, the toughness of platelet grain ceramics was higher than the ceramics with equi-axed grains, and increased up to 6.6 MPam1/2 with grain size. Therefore, it is thought that fracture toughness not only depends on grain size, but also on grain morphology; equations were derived to account for this phenomenon.


Polymer Grain Size Microstructure Mechanical Property Al2O3 
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • Takashi Koyama
    • 1
  • Akio Nishiyama
    • 1
  • Koichi Niihara
    • 2
  1. 1.Central Research InstituteMitsubishi Materials CorporationSaitamaJapan
  2. 2.The Institute of Scientific and Industrial Research (ISIR)Osaka UniversityOsakaJapan

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