Journal of Materials Science

, Volume 31, Issue 19, pp 5027–5031 | Cite as

Response of aluminium/graphite composite to deformation in the semi-solid state

  • C. P. Chen
  • C. -Y. A. Tsao


Semi-solid deformation of Al/graphite (Gr) composites was studied. The effects of deformation temperatures and deformation rates on the macrostructures, morphologies, the deformation force, and the formability of the composites were studied. For Al-10 wt% Gr composites, the semi-solid deformation stress increases as strain increases at lower strain rate. At higher strain rate, the stress first increases to a local maximum, then decreases before it starts to increase again as strain increases. For Al-30 wt% Gr composites, the stress decreases as strain increases. For both the Al-10 wt% Gr composites and Al-30 wt% Gr composites, the higher the deformation strain rate is, the more severe is the degree of cracking. The higher the deformation strain rate, the larger is the deformation stress, not counting the effects of fracturing. The deformation stresses required to semi-solid-deform Al-30 wt% Gr composites are larger than those for Al-10 wt% Gr composites, which is contrary to the normal solid-state deformation behaviours of Al-Gr composites. Composites deformed at 620 °C tend to require a higher deformation stress than at 630 °C for the same deformation strain, due to smaller liquid fraction and lower ductility at 620 °C. The effects of deformation temperatures on the ductility of the compacts are not significant at lower deformation strain rate. However, at the highest deformation strain rate, the ductility is better for higher deformation temperature.


Ductility High Strain Rate Deformation Temperature Liquid Fraction Lower Strain Rate 
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.
    D. B. Spencer, R. Mehrabian and M. C. Flemings, Metall. Trans. 3 (1972) 1925.CrossRefGoogle Scholar
  2. 2.
    M. C. Flemings, ibid. 22A (1991) 957.CrossRefGoogle Scholar
  3. 3.
    D. H. Kirkwood and P. Kapranos, Casting Technology, Jan. (1986) 16.Google Scholar
  4. 4.
    S. B. Brown and M. C. Flemings, Adv. Mater. Proc. Jan. (1993) 36.Google Scholar
  5. 5.
    J. F. Seconde and M. Suery, J. Mater. Sci. 19 (1984) 3995.CrossRefGoogle Scholar
  6. 6.
    V. Laxmann and M. C. Flemings, Metall. Trans. A 11A (1980) 1927.CrossRefGoogle Scholar
  7. 7.
    M. Suery and M. C. Flemings, Ibid. 13A (1982) 1809.CrossRefGoogle Scholar
  8. 8.
    Y. S. Yang and C. -Y. A. Tsao, Scripta Metall. Mater. 30 (1994) 1541.CrossRefGoogle Scholar
  9. 9.
    C. P. Chen and C. -Y. A. Tsao, in Proceedings of 1994 PM2TEC'94 Conference, MPIF-APMI, Toronto, Canada, 1994.Google Scholar
  10. 10.
    H. Lehuy, J. Blain, G. L. Bata and J. Masounave, Metall. Trans. B 15B (1984) 173.Google Scholar
  11. 11.
    P. Kapranos, D. H. Kirkwood and C. M. Sellar, Proc. Inst. Mech. Engrs 207B (1993) 1.Google Scholar
  12. 12.
    M. A. Taha and M. Suery, Metals Tech. 11 (1984) 226.CrossRefGoogle Scholar
  13. 13.
    P. O. Charreyron and M. C. Flemings, Int. J. Mech. Sci. 27 (1985) 781.CrossRefGoogle Scholar
  14. 14.
    L. A. Lalli, Metall. Trans. A 16A (1985) 1393.CrossRefGoogle Scholar
  15. 15.
    M. Kiuchi and S. Sugiyama, J. Mater. Shaping Tech. 8 (1990) 39.CrossRefGoogle Scholar
  16. 16.
    K. Miiwa, K. Kobayashi and T. Nishio, in Proceedings of the 3rd International Conference on Semi-Solid Processing of Alloys and Composites (1994) p. 483.Google Scholar
  17. 17.
    P. Niskanen and W. R. Mohn, Adv. Mater. Proc. Aug. (1988) 39.Google Scholar
  18. 18.
    M. Hunt, Mech. Eng. July (1989) 43.Google Scholar
  19. 19.
    L. Kempfer, Ibid. Aug. (1990) 19.Google Scholar
  20. 20.
    M. Hunt, Ibid. June (1990) 27.Google Scholar
  21. 21.
    M. K. Jain, V. V. Bhanu Prasad, S. V. Kamat, A. B. Paandey, V. A. Varma, B. V. R. Bhat and Y. R. Mahaian, Int. J. Powd. Metall. 29 (1993) 267.Google Scholar

Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • C. P. Chen
    • 1
  • C. -Y. A. Tsao
    • 1
  1. 1.Department of Materials Science and EngineeringNational Cheng Kung UniversityTainanTaiwan

Personalised recommendations