Characterization of free volume in cold-rolled Zr55Cu 30Ni5Al10 bulk metallic glasses

O. Haruyama, K. Kisara, A. Yamashita, K. Kogure, Y. Yokoyama, K. Sugiyama

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

Cold-rolled Zr55Cu30Ni5Al10 bulk metallic glasses (BMGs) exhibited volume dilatation across the entire range of thickness reduction fractions from 5.7% to 63%. The dilatation was dominantly attributed to the free volume generated during cold-rolling, together with any open volumes, like the voids or microcracks, or both, which survived even after sufficiently annealing the rolled sample at the temperature in the supercooled liquid region. The relaxation of free volume formed during cold-rolling resulted in more heat evolution per unit volume than that of as-cast glass. The structural change during cold-rolling could be ascribed to the increased fluctuation of atomic-level hydrostatic stress, 〈p 2〉, in the glass.

Original languageEnglish
Pages (from-to)3224-3232
Number of pages9
JournalActa Materialia
Volume61
Issue number9
DOIs
Publication statusPublished - 2013 May

Keywords

  • Bulk metallic glass
  • Cold rolling
  • Enthalpy increase
  • Volume relaxation
  • X-ray structural analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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