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Constitution and age hardening of Al-Sc alloys

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Abstract

Aluminium-rich alloys from the Al-Sc system were examined to determine the form of the equilibrium phase diagram and to obtain information on age hardening of chill cast alloys. Samples containing up to 8.75wt% Sc were examined using thermal analysis and optical microscopy. This work indicated a eutectic type of phase diagram with a eutectic temperature of about 665° C and a eutectic composition of about 0.6wt% Sc. The scandium-rich primary phase was found to be ScAl3 which is f c c with a lattice parameter of 0.4105nm. Chill cast samples of a 1 wt% Sc alloy were examined for their age hardening behaviour over the temperature range of 225 to 360° C. A maximum hardness of 77 VHN was obtained after ageing at 250° C for 3 days. This hardness was retained after ageing for a total of at least 12 days. The hardening precipitates were ScAl3 which were observed to form via a discontinuous precipitation mechanism. The ScAl3 precipitates were observed to have a parallel orientation relationship with the matrix.

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References

  1. C. M. Adam, “Rapidly Solidified Amorphous and Crystalline Alloys”, edited by B. H. Kear, B. C. Geissen and M. Cohen (Elsevier, 1982) p. 411.

  2. M. E. Drits, E. J. Kadaner, T. V. Dobat-Kina andN. I. Turkina,Russian Metallurgy (4) (1973) 152.

    Google Scholar 

  3. O. P. Naumkin, V. T. Terekhova andE. M. Savitskii,ibid. (4) (1965) 128.

    Google Scholar 

  4. M. E. Drits, L. S. Toropova, Yu. G. Bykov, L. B. Ber andS. G. Pavlenko,ibid. (1) (1982) 148.

    Google Scholar 

  5. R. P. Elliot andF. A. Shunk,Bull. Alloy Phase Diagram 2 (1981) 222.

    Google Scholar 

  6. K. A. Jackson,J. Crystal Growth 1 (1967) 1.

    Google Scholar 

  7. N. W. Blake, PhD thesis, Queen's University, Kingston, Canada (1982).

    Google Scholar 

  8. N. Ryum,Acta Metall. 17 (1969) 269.

    Google Scholar 

  9. E. Sahin andH. Jones, “Rapidly Quenched MaterialsIII” (Metals Society, London, 1978) p. 138.

    Google Scholar 

  10. E. Nes andH. Billdal,Acta Metall. 25 (1977) 1039.

    Google Scholar 

  11. O. Izumi andD. Oeschlagel,Scripta Metall. 3 (1969) 619.

    Google Scholar 

  12. N. Ryum,J. Mater. Sci. 10 (1975) 2075.

    Google Scholar 

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Queen's University, Kingston, Ontario, Canada

    N. Blake

  2. Department of Materials Engineering, Monash University, Clayton, Victoria, Australia

    M. A. Hopkins

Authors
  1. N. Blake
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  2. M. A. Hopkins
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Blake, N., Hopkins, M.A. Constitution and age hardening of Al-Sc alloys. J Mater Sci 20, 2861–2867 (1985). https://doi.org/10.1007/BF00553049

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  • DOI: https://doi.org/10.1007/BF00553049

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