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Short-Range Order in a Ni63.7 Zr36.3 Amorphous Alloy. Effects of Structural Relaxation

  • Y. Calvayrac
  • A. Quivy
  • S. Lefebvre
  • J. Bigot
  • R. Bellissent
Part of the Springer Proceedings in Physics book series (SPPHY, volume 10)

Abstract

Amorphous metallic alloys undergo changes in many physical properties upon annealing at temperatures well below the crystallization temperature. The different phenomena observed are often attributed to changes in the nature and degree of short-range order, but reliable direct evidence by diffraction techniques are very few. Differential Scanning Calorimetry (DSC) is particularly suited to study the enthalpic relaxation of the glass towards the equilibrium liquid configuration and hence to monitor a diffraction study. Two relaxation effects have been observed by DSC [1]:
  • An exothermic phenomenon, extending over a broad range of temperature, occurs during the first scan of the as-quenched sample. This effect is irreversible.

  • After prolonged annealing in a critical temperature range below (but close to) the glass transition temperature Tg, an endothermic peak is observed at Ta upon reheating : in the glass transition region the structural relaxation rate increases and the specimen rapidly readjusts towards the equilibrium state. The effect of initial annealing is eliminated but can be reproduced by repeated annealing.

Keywords

Differential Scanning Calorimetry Amorphous Alloy Glass Transition Region Amorphous Metallic Alloy Partial Structure Factor 
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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Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • Y. Calvayrac
    • 1
  • A. Quivy
    • 1
  • S. Lefebvre
    • 1
  • J. Bigot
    • 1
  • R. Bellissent
    • 2
  1. 1.CECM-CNRSVitryFrance
  2. 2.LLBCEN SaclayGif sur Yvette CedexFrance

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