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Journal of Materials Science

, Volume 29, Issue 12, pp 3185–3192 | Cite as

Fabrication and mechanical behaviour of Al2O3/Mo nanocomposites

  • M. Nawa
  • T. Sekino
  • K. Niihara
Article

Abstract

Two types of Al2O3/Mo composites were fabricated by hot-pressing a mixture of γ- or α-Al2O3 powder and a fine molybdenum powder. For Al2O3/5 vol% Mo composite using γ-Al2O3 as a starting powder, the elongated molybdenum layers were observed to surround a part of the Al2O3 grains, which resulted in an apparent high value of fracture toughness (7.1 Mpa m1/2). In the system using α-Al2O3 as a starting powder, nanometre sized molybdenum particles were dispersed within the Al2O3 grains and at the grain boundaries. Thus, it was confirmed that ceramic/metal nanocomposite was successfully fabricated in the Al2O3/Mo composite system. With increasing molybdenum content, the elongated molybdenum particles were formed at Al2O3 grain boundaries. Considerable improvements of mechanical properties were observed, such as hardness of 19.2 GPa, fracture strength of 884 MPa and toughness of 7.6 MPa m1/2 in the composites containing 5, 7.5, 20 vol% Mo, respectively; however, they were not enhanced simultaneously. The relationships between microstructure and mechanical properties are also discussed.

Keywords

Microstructure Mechanical Property Al2O3 Molybdenum Fracture Toughness 
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

© Chapman & Hall 1994

Authors and Affiliations

  • M. Nawa
    • 1
  • T. Sekino
    • 2
  • K. Niihara
    • 2
  1. 1.Materials Research and Development LaboratoryMatsushita Electric Works LtdOsaka 571Japan
  2. 2.The Institute of Scientific and Industrial ResearchOsaka UniversityOsakaJapan

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