Precise measurement of density in the isothermal relaxation processes of Pd42.5Cu30Ni7.5P20 and Zr 50Cu40Al10 glasses

Osami Haruyama, Yoshihiko Yokoyama, Akihisa Inoue

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The isothermal relaxation processes of bulk Zr50Cu 40Al10 and Pd42.5Cu30Ni 7.5P20 glasses were examined by density reduction associated with relaxation. Density experiments were carried out by buoyancy method at room temperature. The isothermal relaxation curves were best fitted by a stretched exponential function with a Kohlrausch exponent less than unity. Based on free volume model, the reduced free volume xf/as = 0.0355 and flow defect concentrationCf/as= 5.80 × 10-13 in as-quenched state was obtained for Pd42.5Cu 30Ni7.5P20 glass. However, the temperature at which the free volume started to deviate from equilibrium concentration on cooling of the melt was not in accordance with calorimetric glass transition temperature.

Original languageEnglish
Pages (from-to)1708-1710
Number of pages3
JournalMaterials Transactions
Volume48
Issue number7
DOIs
Publication statusPublished - 2007 Jul 1

Keywords

  • Bulk metallic glass
  • Density relaxation
  • Free volume
  • Spread life-time

ASJC Scopus subject areas

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

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