Transient regimes during high-temperature deformation of a bulk metallic glass: a free volume approach

M. Bletry, P. Guyot, Y. Bréchet, J. J. Blandin, J. L. Soubeyroux

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19 Citations (Scopus)

Abstract

The homogeneous deformation of a zirconium-based bulk metallic glass is investigated in the glass transition range. Compression and stress-relaxation tests have been conducted. The stress-strain curves are modeled in the framework of the free volume theory, including transient phenomena (overshoot and undershoot). This approach allows several physical parameters (activation volume, flow defect creation and relaxation coefficient) to be determined from a mechanical experiment. This model is able to rationalize the dependency of stress overshoot on relaxation time. It is shown that, due to the relationship between flow defect concentration and free volume model, it is impossible to determine the equilibrium flow defect concentration. However, the relative variation of flow defect is always the same, and all the model parameters depend on the equilibrium flow defect concentration. The methodology presented in this paper should, in the future, allow the consistency of the free volume model to be assessed.

Original languageEnglish
Pages (from-to)6331-6337
Number of pages7
JournalActa Materialia
Volume55
Issue number18
DOIs
Publication statusPublished - Oct 2007
Externally publishedYes

Keywords

  • Compression test
  • Free volume model
  • High temperature deformation
  • Metallic glasses
  • Plastic deformation

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