International Journal of Metalcasting

, Volume 4, Issue 1, pp 47–50 | Cite as

On the Mechanism of Modification of the Aluminum-Silicon Eutectic by Strontium: The Role of Nucleation

  • M. Makhlouf


The purpose of this contribution is to demonstrate that the presence of strontium in hypoeutectic Al-Si alloys significantly influences the kinetics of nucleation of eutectic silicon; and therefore, contrary to current belief, a complete theory for the mechanism of modification of the eutectic phases in hypoeutectic Al-Si alloys by strontium must address not only the Growth aspects of the process, but also its Nucleation aspects.


eutectic phases aluminum-silicon alloys nucleation kinetics 


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  1. 1.
    Granger D. and Elliott R., ASM Metals Handbook, 9th ed., ASM Int., Metals Park, OH, vol. 15, p 162 (1988).Google Scholar
  2. 2.
    Bernal J.D., Nature, “A Geometrical Approach to the Structure of Liquids”, vol. 183, Issue 4655, pp 141–147 (1959).Google Scholar
  3. 3.
    Kobayashi K. and Hogan L.M., “The Crystal Growth of Silicon in Al-Si Alloys” Journal of Materials Science, vol. 20, no. 6, pp 1961–1975 (1985).CrossRefGoogle Scholar
  4. 4.
    Ino S. and Ogawa S., “Multiply Twinned Particles at Earlier Stages of Gold Film Formation on Alkalihalide Crystals” Journal of the Physical Society of Japan, vol. 22, no. 6, pp 1365–1374 (1967).CrossRefGoogle Scholar
  5. 5.
    Okamoto H., Journal Phase of Equilibria and Diffusion, vol. 27, no. 2, p 204 (2006).Google Scholar
  6. 6.
    Itkin V.P. and Alcock C.B., Bulletin of Alloy Phase Diagrams, vol. 10, no. 6, p 630 (1989).CrossRefGoogle Scholar
  7. 7.
    Turnbull D. and Fisher J.C., Journal of Chemical Physics, vol. 17, p 71 (1949).CrossRefGoogle Scholar
  8. 8.
    Campbell J., International Journal of Cast Metals, vol. 3, no. 1, p 65 (2009).Google Scholar
  9. 9.
    Crosley P.B. and Mondolfo L.F., Modern Castings, vol. 46, p 89 (1966).Google Scholar
  10. 10.
    Shankar S., Riddle Y.W., and Makhlouf M.M., “Nucleation Mechanism of the Eutectic Phases in Aluminum-Silicon Hypoeutectic Alloys” Acta Materialia, vol. 52, Issue 15, pp 4447–4460 (2004).CrossRefGoogle Scholar
  11. 11.
    Liu L., Ph.D. Thesis, “Paramètres Métallurgiques Contrôlant L’évolution Microstructurale Dans Les Alliages De Fonderie Al-Si-Mg and Al-Si-Cu” University of Quebec at Chicoutimi, p 248 (2003).Google Scholar
  12. 12.
    Song K., Kikutchi T., Yoshida M., and Nakae H., Nippon Kinzoku Gakkaishi, vol. 58, no. 12, p 1454 (1994) (in Japanese).Google Scholar
  13. 13.
    Nakae H., in “Solidification and Casting” B. Cantor and K. O’Reilly eds., Institute Of Physics Publishing, Bristol, UK, p 326 (2003).Google Scholar
  14. 14.
    Gruzleski J.E and Closset B.M., “The Treatment of Liquid Aluminum-Silicon Alloys,” American Foundry Society, Des Plaines, IL, p 31 (1990).Google Scholar
  15. 15.
    Verhoeven J.D., Fundamentals of Physical Metallurgy, John Wiley and Sons, New York, NY, p 225 (1975).Google Scholar
  16. 16.
    Bian X., Wang W., and Qin J., Materials Science Forum, vol. 331, p 349 (2000).CrossRefGoogle Scholar
  17. 17.
    Shankar S., Prakash SV., Malik M., Jeykumar M., Walker M.J, and Hamed M., Proceedings of 113th TMS Annual Meeting, San Francisco, CA, p 173 (2009).Google Scholar
  18. 18.
    McDonald S.D., Dahle A.K,. Taylor J.A, and St. John D.H., “Eutectic Grains in Unmodified and Strontium-Modified Hypoeutectic Aluminum-Silicon Alloys” Metallurgical and Materials Transactions A, vol. 35, no. 6, pp 1829–1837 (2004).CrossRefGoogle Scholar
  19. 19.
    Makhlouf M.M., Proc. of the Int. Summer School on High Integrity Die Casting, WPI, Worcester, MA (2008).Google Scholar
  20. 20.
    Closset B., Dugas H., Pekguleryuz M., and Gruzleski J.E., The Aluminum-Strontium Phase Diagram, Metallurgical and Materials Transactions A, vol. 17, no. 7, p 1250–1253 (1986).CrossRefGoogle Scholar
  21. 21.
    Alcock C.B. and Itkin V.P., Bulletin of Alloy Phase Diagrams, vol. 10, no. 6, p 614 (1989).CrossRefGoogle Scholar
  22. 22.
    Hamilton D.R. and Seindensticker R.G., Journal of Applied Physics, vol. 31, p 1165 (1960).CrossRefGoogle Scholar
  23. 23.
    Lu S. and Hellawell A., “The Mechanism of Silicon Modification in Aluminum-Silicon AlloysGoogle Scholar
  24. 24.
    Impurity Induced Twinning”, Metallurgical and Materials Transactions A, vol. 18, no. 10, pp 1721–1733 (1987).Google Scholar

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© American Foundry Society 2010

Authors and Affiliations

  • M. Makhlouf
    • 1
  1. 1.Worcester Polytechnic InstituteWorcesterUSA

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