Viscous flow behaviour of NixZr100-x metallic glasses from Ni30Zr70 to Ni64Zr36

K. Russew, F. Sommer, P. Duhaj, I. Bakonyi

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17 Citations (Scopus)

Abstract

The compositional dependence of viscous flow in the NixZr100-x amorphous system was investigated under non-isothermal conditions at a heating rate of 10 K min-1in the compositional range from x=30 to x=64 at % with the aid of a Hereaus TMA 500 dilatometer. The crystallization behaviour of the same glassy alloys under the same non-isothermal conditions was studied with a Perkin-Elmer DSC 7 differential scanning calorimeter. The characteristic crystallization and viscous flow parameters (the onset temperature, Tx, of crystallization; the temperature, Tm, of maximum heat evolution of the first crystallization step; the enthalpy, ΔHx, of crystallization; the activation energy, Qx, of crystallization; the glass transition temperature, Tg; the viscosity values η (Tg) and ηmin; and the activation energy for viscous flow Qη (T>Tg), were shown to be dependent on composition. This dependence was examined on the basis of the equilibrium phase diagram of the Ni-Zr-system, and it is shown that glassy alloys possessing eutectic compositions manifest the greatest thermal stability because of the long-range atomic diffusion needed for crystallization to occur. Glassy alloys with nearly peritectoid compositions show low thermal stability, as no long-range diffusion is needed for the formation of the stable crystallization end-products NiZr2 and NiZr. In all cases, the crystallization process is governed by viscosity flow of these glassy alloys.

Original languageEnglish
Pages (from-to)3565-3569
Number of pages5
JournalJournal of Materials Science
Volume27
Issue number13
DOIs
Publication statusPublished - Jul 1 1992

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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