Advertisement

Journal of Materials Science

, Volume 29, Issue 9, pp 2491–2499 | Cite as

Microstructural evolution and calorimetric evaluation of non-equilibrium states in rapidly solidified Al-Mn-Co ternary alloys

  • Yibin Zhang
  • Toshimi Yamane
  • Shigeoki Saji
  • Junzo Takahashi
Papers

Abstract

Evolutionary structures were observed in as-melt spun ribbons of Al-3.5Mn-0.8Co, Al-3.5Mn-1.3Co, Al-3.5Mn-2Co, Al-5Mn-0.8Co and Al-5Mn-2Co alloys. The evolutionary structures contained two zones, zone A and zone B, at the chilled and unchilled sides, respectively. A banded structure was observed between the two zones as a transitional region in the Al-3.5Mn-1.3Co alloy. The enthalpy differences, ΔH O ne , between a non-equilibrium state in as-melt spun ribbons and the equilibrium state in fully annealed ribbons of the Al-Mn-Co alloys were evaluated using data obtained by differential scanning calorimetry (DSC) measurements. The values of ΔH O ne for Al-Mn-Co alloys are lower than those for Al-Mn binary alloys. ΔH O ne corresponds to a decrease in Gibbs free energy, ΔG, which is stored in a solidified solid during rapid solidification. The formation of the banded structure is interpreted on the basis of an analysis of the distribution of ΔH O ne or the fluctuation in ΔG, which should oscillate in order to correspond with a gradual reduction of cooling ability for the constrained solidification by the substrate.

Keywords

Polymer Enthalpy Free Energy Differential Scanning Calorimetry Equilibrium State 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Reference

  1. 1.
    H. Jones, Mater. Sci. Engng. 5 (1969/70) 1.CrossRefGoogle Scholar
  2. 2.
    W. J. Boettinger, L. Bendersky and J. G. Early, Metall. Trans. A 17 (1986) 781.CrossRefGoogle Scholar
  3. 3.
    W. J. Boettinger, L. Bendersky, R. J. Schaefer and F. S. Biancaniello, ibid. 19 (1988) 1101.CrossRefGoogle Scholar
  4. 4.
    L. A. Bendersky, A. J. McAlister and F. S. Biancaniello, ibid. 19 (1988) 2893.CrossRefGoogle Scholar
  5. 5.
    J. D. Cotton and M. J. Kaufman, ibid. 22 (1991) 927.CrossRefGoogle Scholar
  6. 6.
    Y. Zhang, T. Yamane, K. Hirao and Y. Minamino, J. Mater. Sci. 26 (1991) 5799.CrossRefGoogle Scholar
  7. 7.
    D. G. Beck, S. M. Copley and M. Bass, Metall. Trans. A 12 (1981) 1687, and A 13 (1982) 1879.CrossRefGoogle Scholar
  8. 8.
    W. J. Boettinger, D. Shechtman, R. J. Schaefer and F. S. Biancaniello, ibid. 15 (1984) 55.CrossRefGoogle Scholar
  9. 9.
    A. Kamio, H. Tezuka, T. Sato, Than Trong Long and T. Takahashi, J. Jpn. Inst. Light Metals (in Japanese) 35 (1985) 275.CrossRefGoogle Scholar
  10. 10.
    M. Zimmermann, M. Carrard, M. Gremaud and W. Kurz, Mater. Sci. Engng. A 134 (1991) 1278.CrossRefGoogle Scholar
  11. 11.
    M. Gremaud, M. Carrard and W. Kurz, Acta Metall 38 (1990) 2587, 39 (1991) 1431.CrossRefGoogle Scholar
  12. 12.
    M. Carrard, M. Gremaud, M. Zimmermann and W. Kurz, ibid. 40 (1992) 983.CrossRefGoogle Scholar
  13. 13.
    D. Shechtman, R. J. Schaefer and F. S. Biancaniello, Metall Trans. A 15 (1984) 1987.CrossRefGoogle Scholar
  14. 14.
    K. Yu-Zhang, M. Harmelin, A. Quivy, Y. Calvayrac, J. Bigot and R. Portier, Mater. Sci. Engng. 99 (1988) 385.CrossRefGoogle Scholar
  15. 15.
    J. A. Juarez-Islar, D. H. Warrington and H. Jones, J. Mater. Sci. 24 (1989) 2076.CrossRefGoogle Scholar
  16. 16.
    Y. Zhang, T. Yamane, S. Saji and J. Takahashi, J. Mater. Sci. 28 (1993) 3235.CrossRefGoogle Scholar
  17. 17.
    T. Ohashi, L. Dai and N. Fukatsu, Metall. Trans. A 17 (1986) 799.CrossRefGoogle Scholar
  18. 18.
    L. A. Bendersky, F. S. Biancaniello, S. D. Ridder and A. J. Shapiro, Mater. Sci. Engng. A 134 (1991) 1098.CrossRefGoogle Scholar
  19. 19.
    K. F. Kobayashi, H. Kawaura and P. H. Shingu, in “Aluminum alloys — their physical and mechanical properties”, Vol. 1, edited by E. A. Starke and T. H. Sanders (EMAS, Warley, 1986) p. 247.Google Scholar
  20. 20.
    W. Kurz and D. J. Fisher, in “Fundamentals of solidification” (Trans Tech Publications, Aedermannsdorf, Switzerland, 1986) p. 220.Google Scholar
  21. 21.
    J. C. Baker and J. W. Cahn, in “Solidification” (American Society for Metals, Metals Park, OH, 1971) p. 23.Google Scholar
  22. 22.
    Y. Zhang, T. Yamane, S. Saji and J. Takahashi, Met. Trans. in press.Google Scholar
  23. 23.
    T. Soma, Y. Funayama and H. Kagaya, J. Mater. Sci. 25 (1990) 3917.CrossRefGoogle Scholar
  24. 24.
    Y. Zhang, Y. Yamane and J. Takahashi, J. Mater. Sci. Lett. 11 (1992) 155.CrossRefGoogle Scholar
  25. 25.
    W. J. Boettinger and M. J. Aziz, Acta Metall. 37 (1989) 3379.CrossRefGoogle Scholar
  26. 26.
    I. Barin, “Thermochemical data of pure substances” (VCH, Weinhein, 1989) p. 17.Google Scholar

Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • Yibin Zhang
    • 1
  • Toshimi Yamane
    • 1
  • Shigeoki Saji
    • 1
  • Junzo Takahashi
    • 2
  1. 1.Department of Materials Science and Engineering, Faculty of EngineeringOsaka UniversityOsakaJapan
  2. 2.Department of Dental Technology, Faculty of DentistryOsaka UniversityOsakaJapan

Personalised recommendations