Annealing effects on viscosity of Zr55Cu30Al 10Ni5 supercooled liquids

T. Yamasaki, S. Maeda, T. Fukami, Y. Yokoyama, H. M. Kimura, A. Inoue

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Viscous flow behavior in supercooled liquid region of as-cast and annealed Zr55Cu30Al10Ni5 bulk metallic glasses has been examined by using a penetration viscometer under various heating rates of 20, 200 and 400°C/min. Applied load for the cylindrical-shaped penetration indenter with a diameter of 1 mm was varied from 0.049 N to 0.294 N. Viscosity was quite independent of these applied loads under the various heating conditions. When the sample was slowly heated at the rate of 20°C/min, viscosity exhibited relatively high values that may be mainly due to the skin effects of oxides on the sample surface. At the heating rate of 200°C/min and above, viscosity (η) largely decreased and tended to saturate. By annealing the bulk metallic glasses at 400°C, the density of the glasses increased, while the crystallization temperature (Tx), the viscosity and the activation energy for viscous flow in their soopercooled liquid decreased gradually with increasing the annealing time. The specific behaviour of viscosity has been explained by the formation of particles during annealing for relaxation.

Original languageEnglish
Pages (from-to)1834-1837
Number of pages4
JournalMaterials Transactions
Volume48
Issue number7
DOIs
Publication statusPublished - 2007 Jul

Keywords

  • Annealing effects
  • Bulk metallic glass
  • Supercooled liquid
  • Viscosity
  • ZrCuAlNi

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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