Journal of Materials Science

, Volume 18, Issue 10, pp 3011–3022 | Cite as

Electron microscopic investigations on a melt-quenched Al-Rh alloy

  • Zariff A. Chaudhury
  • C. Suryanarayana


An Al-2 wt% Rh alloy was subjected to rapid quenching from the molten state and transmission electron microscopy and diffraction techniques were extensively used to characterize the phases present. Melt quenching led to the formation of a homogeneous solid solution, indicating a substantial increase in solid solubility limit over the equilibrium value. Although stable up to about 640 K, the supersaturated solid solution decomposed at elevated temperatures to a mixture of aluminium solid solution and an intermediate phase, which has been identified to have a monoclinic structure witha=1.636 nm,b=0.805 nm,c=1.279 nm andΒ=107.77° with a stoichiometry corresponding to Al13Rh4. Although heterogeneous nucleation at grain boundaries was the predominant feature, the precipitate also formed as WidmanstÄtten platelets inside the grains. This phase has been shown to be an equilibrium phase. Very long annealing treatments at temperatures of 773 K resulted in the formation of an ordered phase. The long-range order was destroyed on heating to still higher temperatures. The equilibrium constitution of the alloy has been shown to be a mixture of Al13Rh4 and aluminium solid solution.


Transmission Electron Microscopy Solid Solution Solid Solubility Annealing Treatment Intermediate Phase 
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  1. 1.
    P. Duwez,Trans. ASM Qly. 60 (1967) 607.Google Scholar
  2. 2.
    T. R. Anantharaman andC. Suryanarayana,J. Mater. Sci. 6 (1971) 1111.Google Scholar
  3. 3.
    H. Jones andC. Suryanarayana,ibid. 8 (1973) 705.Google Scholar
  4. 4.
    T. R. Anantharaman, P. Ramachandrarao, C. Suryanarayana, S. Lele andK. Chattopadhyay,Trans. Indian Inst. Met. 30 (1977) 423.Google Scholar
  5. 5.
    C. Suryanarayana, “Rapidly Quenched Metals — A Bibliography 1973–1979” (IFI/Plenum, New York, 1980).Google Scholar
  6. 6.
    H. Jones, “Rapid Solidification of Metals and Alloys”, Monograph No. 8 (Institution of Metallurgists, London, 1982).Google Scholar
  7. 7.
    G. V. S. Sastry andC. Suryanarayana,Mater. Sci. Eng. 47 (1981) 193.Google Scholar
  8. 8.
    G. V. S. Sastry, C. Suryanarayana andG. Van Tendeloo,Phys. Status Solidi (a) 73 (1982) 267.Google Scholar
  9. 9.
    Z. A. Chaudhury, G. V. S. Sastry andC. Suryanarayana,Z Metallkd. 73 (1982) 201.Google Scholar
  10. 10.
    Z. A. Chaudhury andC. Suryanarayana,J. Mater. Sci. 17 (1982) 3158.Google Scholar
  11. 11.
    Idem, Philips Electron Opt. Bull. 118 (1982) 23.Google Scholar
  12. 12.
    Idem, Thin Solid Films 98 (1982) 233.Google Scholar
  13. 13.
    Idem, J. Less-Common Met. 91 (1983) 181.Google Scholar
  14. 14.
    F. A. Shunk, “Constitution of Binary Alloys”, Second Supplement (McGraw-Hill, New York, 1969) p. 40.Google Scholar
  15. 15.
    L. F. Mondolfo, “Aluminium Alloys, Structure and Properties” (Butterworths, London, 1976).Google Scholar
  16. 16.
    W. B. Pearson, “A Handbook of Lattice Spacings and Structures of Metals and Alloys”, Vol. 2 (Pergamon Press, Oxford, 1967).Google Scholar
  17. 17.
    P. Duwez andR. H. Willens,Trans. TMS-AIME 227 (1963) 362.Google Scholar
  18. 18.
    D. B. Williams andJ. W. Edington, in “Rapidly Quenched Metals” (Proceedings of the 2nd International Conference), edited by N. J. Grant and B. C. Giessen, (M.I.T. Press, Cambridge, 1976) p. 135.Google Scholar
  19. 19.
    H. Jones, in “Vacancies '76”, edited by R. E. Smallman and J. E. Harrier (The Metals Society, London, 1977) p. 175.Google Scholar
  20. 20.
    L. R. K. Rao, C. Suryanarayana andS. Lele,Aluminium 58 (1982) 214.Google Scholar
  21. 21.
    P. H. Shingu, J. Takamura andM. Kawashima,Suiyokwai-Shi 16 (1968) 472 (in Japanese).Google Scholar
  22. 22.
    Idem, Met. Abs. Light Met. Alloys Jpn. 4 (1969) 101.Google Scholar
  23. 23.
    G. V. S. Sastry, C. Suryanarayana, G. Van Tendeloo andM. Van Sande,Mater. Res. Bull. 13 (1978) 1065.Google Scholar
  24. 24.
    P. Furrer, T. R. Anantharaman andH. Warlimont,Phil. Mag. 21 (1970) 873.Google Scholar
  25. 25.
    P. Duwez, R. H. Willens andW. Klement,J. Appl. Phys. 31 (1960) 1136.Google Scholar
  26. 26.
    G. Sridhar, M. Hanumantha Rao andC. Suryanarayana, unpublished results (1982).Google Scholar
  27. 27.
    B. C. Giessen andR. H. Willens, “Phase Diagrams: Materials Science and Technology” Vol. 3, edited by A. M. Alper (Academic Press, New York, 1970) p. 103.Google Scholar
  28. 28.
    L. Edshammar,Acta Chem. Scand. 22 (1968) 2822.Google Scholar

Copyright information

© Chapman and Hall Ltd 1983

Authors and Affiliations

  • Zariff A. Chaudhury
    • 1
  • C. Suryanarayana
    • 1
  1. 1.Centre of Advanced Study in Metallurgy, Department of Metallurgical EngineeringBanaras Hindu UniversityVaranasiIndia

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