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


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).


Zirconium Amorphous Alloy Ternary Alloy Endothermic Reaction Nickel Atom 
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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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