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Journal of Materials Science

, Volume 26, Issue 4, pp 985–992 | Cite as

Fabrication, properties and structure of a high temperature light alloy composite

  • N. Raghunathan
  • E. K. Ioannidis
  • T. Sheppard
Papers

Abstract

Paniculate alumina reinforced Al-4Cr-1 Fe alloys were fabricated from rapidly solidified aluminium alloy powder and commercially purchased alumina powder by traditional powder metallurgical techniques involving powder mixing and cold compaction followed by hot extrusion. The tensile tests at ambient temperature indicated a considerable improvement in the mechanical strength at the expense of ductility and modulus. Poor values of modulus were explained by the presence of porosity in the composites. The high temperature mechanical properties of the matrix, tested at 350 °C after prolonged exposure to the test temperature under static air conditions, were intrinsically poor. Additions of the filler material, alumina particles, up to a weight fraction of 15% did not improve the high temperature performance of the matrix substantially. Possible causes for this are discussed and alternatives proposed.

Keywords

Ductility Compaction Aluminium Alloy Tensile Test Alumina Particle 
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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References

  1. 1.
    E. K. Ioannidis andT. Sheppard,J. Mater. Sci. 25 (1990) 3965.CrossRefGoogle Scholar
  2. 2.
    N. Raghunathan, H. B. Mcshane, C. H. Davis andT. Sheppard,ibid. 15 (1990) 4906.CrossRefGoogle Scholar
  3. 3.
    J. W. Martin, “Micromechanisms in particle hardened structures” (Cambridge University Press, Cambridge, 1980) pp. 91–95.Google Scholar
  4. 4.
    P. K. Ghosh, P. R. Prasad andS. Ray,Z. Metalkde,74 (1984) pp.934–937.Google Scholar

Copyright information

© Chapman and Hall Ltd 1991

Authors and Affiliations

  • N. Raghunathan
    • 1
  • E. K. Ioannidis
    • 1
  • T. Sheppard
    • 1
  1. 1.Department of MaterialsImperial College of Science, Technology and MedicineLondonUK

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