Atomic structure of bulk metallic glasses and their supercooled liquid states probed by high-energy synchrotron light

K. Georgarakis, A. R. Yavari, D. V. Louzguine, G. Vaughan, W. J. Botta

Research output: Contribution to journalShort survey

2 Citations (Scopus)

Abstract

Like non-metallic glasses, many bulk metallic glasses manifest a glass-transition temperature T g during heating prior to crystallisation. While the exact nature of the atomic structure of a metallic glass depends on its thermo-mechanical history (quench-rate, plastic deformation, ...), a unique and reproducible average atomic structure is attained if the glass transition temperature can be approached in a reversible manner. However, a metallic glass is always metastable and crystallises within a time t near or above its T g in such a way that any reciprocal or real-space information on the fully glassy state at T≥T g must be completed within acquisition times τ a≪t and this condition is in general difficult to attain with conventional X-ray diffraction devices. Here we report on experiments using high-energy, high-flux synchrotron light in the transmission for probing of the atomic structure of bulk metallic glasses. Examples are given of the determination of the isochoric glass transition T g and the quenched-in free-volume. Finally, we report on the evolution of the atomic structure in the supercooled liquid region (T>T g) and its role in the enhancement of glass formability.

Original languageEnglish
Pages (from-to)218-226
Number of pages9
JournalComptes Rendus Physique
Volume13
Issue number3
DOIs
Publication statusPublished - 2012 Apr

Keywords

  • Atomic structure
  • Bulk metallic glasses
  • Supercooled liquid
  • Synchrotron light

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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