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Journal of Materials Science

, Volume 20, Issue 11, pp 4057–4068 | Cite as

Enthalpy relaxation behaviour of metal-metal (Zr-Cu) amorphous alloys upon annealing

  • A. Inoue
  • T. Masumoto
  • H. S. Chen
Papers

Abstract

Anneal-induced enthalpy relaxation behaviour was examined calorimetrically for Zr50-70Cu50-30, Zr70(Cu-Fe)30 and Zr70(Cu-Ni)30 amorphous alloys. When the alloys annealed at temperatures belowTg are heated, an excess endothermic reaction (enthalpy relaxation) occurs above the annealing temperatureTa. The peak temperature of ΔCp,endo, evolves in a continuous manner with lnta. The magnitudes of ΔCp,endo and ΔHendo for Zr-Cu binary alloys increase gradually with risingTa and then rapidly at temperatures just belowTg, while their changes as a function ofTa for the ternary alloys show a distinct two-stage splitting; a low-temperature one which peaks at aboutTg — 150 K and a high-temperature peak just belowTg. From the result that the addition of iron or nickel causes the two stage splitting of the ΔCp,endo (Ta), it was proposed that the low-temperature endothermic peak is attributed to local and medium range rearrangments of copper and iron or nickel atoms with weak bonding nature and the high-temperature reaction to the long-range co-operative regroupings of zirconium and copper, iron or nickel atoms which are composed of the skeleton structure in the metal-metal amorphous alloys. The mechanism for the appearance of the two-stage enthalpy relaxation was investigated by the concept of two-stage distributions of relaxation times proposed previously, and the distinct two-stage splitting was interpreted as arising from the distinctly distinguishable difference in the ease of atomic rearrangements between Cu-(Fe or Ni) and Zr-(Cu, Fe or Ni).

Keywords

Zirconium Amorphous Alloy Ternary Alloy Endothermic Reaction Nickel Atom 
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.

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References

  1. 1.
    H. S. Chen,J. Appl. Phys. 52 (1981) 1868.Google Scholar
  2. 2.
    Idem, Proceedings of the 4th International Conference on Rapidly Quenched Metals, Sendai, Japan, August 1981, edited by T. Masumoto and K. Suzuki (Japan Institute of Metals, Sendai, 1982) p. 495.Google Scholar
  3. 3.
    J. W. Drijver, A. L. Mulder andS. Radelaar,ibid., p. 535.Google Scholar
  4. 4.
    H. S. Chen,J. Non-Cryst. Solids 46 (1981) 289.Google Scholar
  5. 5.
    H. S. Chen andA. Inoue,ibid. 61/62 (1984) 805.Google Scholar
  6. 6.
    A. Inoue, T. Masumoto andH. S. Chen,J. Mater. Sci. 19 (1984) 3953.Google Scholar
  7. 7.
    Idem, ibid. 20 (1985) in press.Google Scholar
  8. 8.
    M. Harmelin, Y. Cavayrac, A. Quivy, J. Bigot, P. Burnier andM. Fayard,J. Non-Cryst. Solids 61/62 (1984) 931.Google Scholar
  9. 9.
    F. Sommer, H. Haas andB. Predel,ibid. 61/62 (1984) 793.Google Scholar
  10. 10.
    H. S. Chen andJ. T. Krause,Scripta Metall. 11 (1977) 761.Google Scholar
  11. 11.
    A. J. Kavacs,Fotchr. Hochpolym — Forsch 3 (1963) 394.Google Scholar
  12. 12.
    H. S. Chen,J. Appl. Phys 49 (1978) 4595.Google Scholar
  13. 13.
    R. O. Suzuki andP. H. Shingu,J. Non-Cryst. Solids 61/62 (1984) 1003.Google Scholar
  14. 14.
    H. S. Chen,ibid. 27 (1978) 257.Google Scholar
  15. 15.
    T. Ozawa,Polymer 12 (1971) 51.Google Scholar
  16. 16.
    C. Antonione, L. Battezzati, A. Lucci, G. Riontino andG. Venturello,Scripta Metall. 12 (1978) 1011.Google Scholar
  17. 17.
    H. S. Chen,Sci. Rep. Res. Inst. Tohoku Univ. A-27 (1979) 97.Google Scholar
  18. 18.
    W. Primak,Phys. Rev. 100 (1955) 1677.Google Scholar
  19. 19.
    M. H. Cohen andG. S. Crest,ibid. B20 (1979) 1077.Google Scholar
  20. 20.
    M. Cyat,J. Phys. C8 (1980) 107.Google Scholar
  21. 21.
    A. Inoue, T. Masumoto andH. S. Chen, unpublished research (1984).Google Scholar

Copyright information

© Chapman and Hall Ltd 1985

Authors and Affiliations

  • A. Inoue
    • 1
  • T. Masumoto
    • 2
  • H. S. Chen
    • 1
  1. 1.AT&T Bell LaboratoriesMurray HillUSA
  2. 2.The Research Institute for Iron, Steel and Other MetalsTohoku UniversitySendaiJapan

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