Journal of Materials Science

, Volume 15, Issue 3, pp 685–692 | Cite as

Rapid solidification and decomposition of a hypomonotectic Al-Cd alloy

  • K. Chattopadhyay
  • P. Ramachandrarao
Papers

Abstract

Rapid solidification of Al-1.5at % Cd alloy can lead to a wide variety of morphologies. The sequence of the morphologies with increasing foil thickness is single phase → elongated cell → hexagonal cell → dendrite. Monotectic reaction ahead of the solid-liquid interface leads to a unique distribution of the cadmium particles. Models are proposed to explain the genesis of the distribution of these particles. The study of the decomposition behaviour confirms the existence of a preprecipitation stage. The G.P. zones are found to be spherical and lead to a precipitate-free zone near grain/cell boundaries. The coarsening of the precipitates at liquid temperatures takes place by the migration and coalescence of the droplets.

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References

  1. 1.
    G. A. Chadwick, Brit. J. Appl. Phys. 16 (1965) 1095.Google Scholar
  2. 2.
    S. N. Ojha and K. Chattopadhyay, Trans. Indian Inst. Metals 31 (1978) 208.Google Scholar
  3. 3.
    P. Ramachandrarao, P. Rama Rao and T. R. Anantharaman, Z. Metallk. 63 (1972) 43.Google Scholar
  4. 4.
    T. R. Anantharaman, P. Ramachandrarao, C. Suryanarayana, S. Lele and K. Chattopadhyay, Trans. Indian Inst. Metals 30 (1977) 423.Google Scholar
  5. 5.
    W. A. Tiller, K. A. Jackson, J. W. Rutter and B. Chalmers, Acta Met. 1 (1953) 428.Google Scholar
  6. 6.
    W. W. Mullins and R. F. Sekereka, J. Appl. Phys. 34 (1963) 323.Google Scholar
  7. 7.
    L. R. Morris and W. C. Winegard, J. Crystal Growth 5 (1969) 361.Google Scholar
  8. 8.
    W. C. Winegard, Met. Rev. 6 (1961) 57.Google Scholar
  9. 9.
    M. C. Flemings, “Solidification Processing” (McGraw-Hill, New York, 1974).Google Scholar
  10. 10.
    J. D. Hunt, Proceedings, Sheffield International Conference on Solidification and Casting (The Metal Society, London, 1979) p. 3.Google Scholar
  11. 11.
    D. R. Uhlmann, B. Chalmers and K. A. Jackson, J. Appl. Phys. 35 (1964) 2986.Google Scholar
  12. 12.
    H. K. Hardy, J. Inst. Metals 80 (1951–52) 483.Google Scholar
  13. 13.
    E. Holmes and B. Noble, ibid. 95 (1967) 106.Google Scholar
  14. 14.
    B. Noble and C. H. Thornton, Met. Sci. J. 2 (1969) 86.Google Scholar
  15. 15.
    S. Ceresara and P. Fiorini, Phil. Mag. 19 (1969) 105.Google Scholar
  16. 16.
    J. M. Silcock, J. Inst. Metals 84 (1955–56) 19.Google Scholar
  17. 17.
    G. W. Lorimer and R. B. Nicholson, Acta Met. 14 (1966) 1009.Google Scholar
  18. 18.
    D. R. Spalding, R. E. Villagrana and G. A. Chadwick, Phil. Mag. 20 (1969) 471.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1980

Authors and Affiliations

  • K. Chattopadhyay
    • 1
  • P. Ramachandrarao
    • 1
  1. 1.Department of Metallurgical EngineeringBanaras Hindu UniversityVaranasiIndia

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