Variations in atomic structural features of a supercooled Pd-Ni-Cu-P glass forming liquid during in situ vitrification

Konstantinos Georgarakis, Dmitri V. Louzguine-Luzgin, Jerzy Antonowicz, Gavin Vaughan, Alain R. Yavari, Takeshi Egami, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

In situ vitrification in a synchrotron beam during cooling of a Pd 42.5Cu30Ni7.5P20 melt allowed continuous acquisition of X-ray diffraction spectra in the supercooled liquid region between the liquidus temperature Tl and the glass transition temperature Tg for the first time in a metallic liquid alloy. These and subsequent acquisitions on reheating allowed determination of the structural changes in the supercooled and glassy states using the real space atomic pair distribution function PDF(R) and radial distribution function RDF(R). The nearest neighbor (NN) distance in the first coordination shell has a low R peak (pre-peak) that appears and increases on cooling from the liquidus temperature to the glass transition temperature in the supercooled liquid region. In this temperature range reversible expansion of the NN distances in the first coordination shell is observed. The slope of the expansion changes discontinuously at the glass transition. This behavior is explained by the theory of local topological fluctuations.

Original languageEnglish
Pages (from-to)708-716
Number of pages9
JournalActa Materialia
Volume59
Issue number2
DOIs
Publication statusPublished - 2011 Jan

Keywords

  • Metallic glasses
  • Solidification
  • Synchrotron radiation

ASJC Scopus subject areas

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

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