Journal of Materials Science

, Volume 3, Issue 1, pp 1–8 | Cite as

Study of the recrystallisation of aluminium/alumina (SAP) alloys

  • A. Desalvo
  • D. Nobili


The influence of the introduction of aluminium nuclei on the recrystallisation behaviour of SAP (sintered aluminium powder) was studied by metallographic observations using a new etching reagent, and by transmission electron microscopy. It was observed that the artificial nuclei can grow in the SAP matrix only in the temperature range in which the alloy recrystallises spontaneously. It is concluded that the physical process inhibited by the dispersed particles is grain-boundary migration.

These results and those previously reported confirm Cahn's theory (which regards the formation of new grains as due to recovery phenomena localised in the regions of highest lattice distortion) supplemented by the coalescence mechanism proposed by Hu and Li, Moreover, the basic concepts of “nucleation” and “growth” currently employed to describe recrystallisation phenomena are critically discussed: it is concluded that a reformulation of these concepts is necessary on the basis of the information obtained by means of the more recent experimental techniques, such as electron microscopy.


Transmission Electron Microscopy Recrystallization Disperse Particle Basic Concept Lattice Distortion 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    E. J. Westerman and F. V. Lenel, Trans. AIME 218 (1960) 1010.Google Scholar
  2. 2.
    D. Nobili and R. De Maria, J. Nucl. Matls. 17 (1965) 5.Google Scholar
  3. 3.
    G. F. Missiroli, D. Nobili, and F. Zignani, ibid 21 (1967) 199.Google Scholar
  4. 4.
    R. W. Cahn, in “Physical Metallurgy”, edited by R. W. Cahn, Chapter 19 (North-Holland, 1965).Google Scholar
  5. 5.
    Second Euratom Quarterly Report, Org. 177/64/4 (1965).Google Scholar
  6. 6.
    H. Hu, Trans. AIME 224 (1962) 75.Google Scholar
  7. 7.
    J. C. M. Li, J. Appl. Phys. 33 (1962) 2958.Google Scholar
  8. 8.
    S. Weissmann, T. Imura, and N. Hosokawa, in “Recovery and Recrystallisation of Metals”, edited by L. Himmel (Interscience, 1963), p. 241.Google Scholar
  9. 9.
    C. J. Smithells, “Metals Reference Book”, Vol. I (Butterworths, 1955), pp. 256 and 262.Google Scholar
  10. 10.
    J. W. Christian, in “Physical Metallurgy”, edited by R. W. Cahn (North-Holland, 1965), p. 477.Google Scholar
  11. 11.
    R. A. Oriani, Acta Met. 8 (1960) 134.Google Scholar
  12. 12.
    P. A. Beck, Adv. Phys. 3 (1954) 245.Google Scholar
  13. 13.
    W. Bollmann, J. Inst. Metals. 87 (1958–9) 439.Google Scholar
  14. 14.
    J. E. Burke and D. Turnbull, Prog. Met. Phys. 3 (1952) 220.Google Scholar
  15. 15.
    R. A. Vendermeer and P. Gordon, in “Recovery and Recrystallisation of Metals”, edited by L. Himmel (Interscience, 1963), p. 211.Google Scholar
  16. 16.
    R. D. Doherty and J. W. Martin, J. Inst. Metals 91 (1962–3) 332.Google Scholar
  17. 17.
    R. W. Cahn, Proc. Phys. Soc. A 63 (1950) 323.Google Scholar
  18. 18.
    J. E. Bailey and P. B. Hirsch, Proc. Roy. Soc. A 267 (1962) 11.Google Scholar

Copyright information

© Chapman and Hall 1968

Authors and Affiliations

  • A. Desalvo
    • 1
    • 2
  • D. Nobili
    • 3
  1. 1.Istituto di FisicaThe UniversityBolognaItaly
  2. 2.Gruppo Naz. Struttura della MateriaC.N.R.Italia
  3. 3.Physical Chemistry DepartmentEuratomIspraItaly

Personalised recommendations