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Journal of Materials Science

, Volume 27, Issue 10, pp 2599–2605 | Cite as

Suppression of θ″ formation in the SiC whisker-reinforced Al-4 wt% Cu composites

  • T. S. Kim
  • T. H. Kim
  • K. H. Oh
  • H. I. Lee
Papers

Abstract

Precipitation characteristics in a powder metallurgy (Al-4wt% Cu)-SiC whisker composite were investigated using transmission electron microscopy, differential scanning calorimetry, and macrohardness measurement. The results of macrohardness measurement show that the peak ageing is significantly retarded in the SiC whisker-reinforced Al-Cu alloys. It is shown that the suppression of θ″ formation plays an important role in the retarded age hardening. The suppression of θ″ formation is attributed to a high density of dislocations due to the difference in the thermal contraction between the whiskers and matrix. Numerical analysis was performed to estimate the misfit strain generated during cooling near the whiskers. The results indicate that a high density of dislocations should be developed by the relief of the misfit strain.

Keywords

Polymer Precipitation Microscopy Electron Microscopy Transmission Electron Microscopy 
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.
    T. G. Nich and R. F. Karlak, Scripta metall. 18 (1984) 25.CrossRefGoogle Scholar
  2. 2.
    T. Christman and S. Suresh, Acta Metall. 36 (1988) 1691.CrossRefGoogle Scholar
  3. 3.
    S. Ceresara and P. Fiorini, Powder Metall. 1 (1979) 1.CrossRefGoogle Scholar
  4. 4.
    Idem, ibid. 4 (1981) 210.CrossRefGoogle Scholar
  5. 5.
    C. M. Friend and S. D. Luxton, J. Mater. Sci. 23 (1988) 3173.CrossRefGoogle Scholar
  6. 6.
    S. R. Nutt and R. W. Carpenter, Mater. Sci. Engng 75 (1985) 169.CrossRefGoogle Scholar
  7. 7.
    H. I. Lee et al., KAIST report for project I11610, Korea (1986).Google Scholar
  8. 8.
    H. I. Lee et al., Technical report MARD-411-88099, Korea (1988).Google Scholar
  9. 9.
    J. M. Silcock, T. J. Heal and H. K. Hardy, J. Inst. Metals 82 (1953–1954) 239.Google Scholar
  10. 10.
    H. K. Hardy, ibid. 79 (1951) 321.Google Scholar
  11. 11.
    J. M. Papazian, A. Levy and P. N. Alder, Technical report AFOSR-TR-87-1658, USA (1987).Google Scholar
  12. 12.
    R. Graf and A. Guinier, Compt. Rend. 238 (1954) 2175.Google Scholar
  13. 13.
    J. D. Cook and J. Nutting, in “The mechanism of phase transformation in crystalline solids,” edited by R. B. Nicholson (The Institute of Metals, London, 1968) p. 54.Google Scholar
  14. 14.
    M. Taya and T. Mori, Acta Metall. 35 (1987) 155.CrossRefGoogle Scholar
  15. 15.
    I. B. Jeong, PhD thesis, Seoul National University, Korea (1988).Google Scholar

Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • T. S. Kim
    • 1
  • T. H. Kim
    • 1
  • K. H. Oh
    • 2
  • H. I. Lee
    • 2
  1. 1.Department of Metallurgical EngineeringSeoul National UniversitySeoulKorea
  2. 2.Materials Engineering DivisionKorea Advanced Institute of Science and TechnologySeoulKorea

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