Chapter 76. Anisotropic Mechanical Properties of Al2O3/Al Composities Produced by Direct Melt Oxidation

  1. Todd Jessen and
  2. Ersan Ustundag
  1. Hong Sik Park and
  2. Do Kyung Kim

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294628.ch76

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

How to Cite

Park, H. S. and Kim, D. K. (2000) Anisotropic Mechanical Properties of Al2O3/Al Composities Produced by Direct Melt Oxidation, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294628.ch76

Author Information

  1. Dept. of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Taejon, 305-701, Korea

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375686

Online ISBN: 9780470294628

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Keywords:

  • alumina;
  • alumina matrix composites;
  • mechanical properties;
  • carbon nanotubes;
  • multi-wall nanotubes

Summary

Al2O3/Al Composites can be fabricated by the directed oxidation of Al alloy. It has been reported that the Al2O3 grains have grown with the preferred orientation with low angle grain boundary, thus it is expected that mechanical properties are different with growth direction. The microstructural analysis shows the Al2O3 grains are highly oriented with its (0001) basal plane nearly parallel to the specimen surface and with its prismatic or pyramidal plane nearly parallel to the surface. The volume fraction of metal phase in composite is similar regardless of orientation. The flexural strength of Al2O3/Al composite shows 440±46 MPa in perpendicular and 303±48 MPa in parallel to the growth direction. There is about a 30 % difference in flexural strength and a highly different fracture mode with the direction of crack propagation. The discrepancy in flexural strength is considered to be related with different fracture mode due to different fracture energy and toughness with crystallographic plane of alumina.