Nanometer-scale solute clustering in aluminum-nickel-ytterbium metallic glasses

Dieter Isheim*, David N. Seidman, John H. Perepezko, Gregory B. Olson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The transformation sequence of melt-spun Al-5.2at.% Ni-6.8at.% Yb is characterized by X-ray diffraction, differential scanning calorimetry (DSC), and atom-probe field-ion microscopy. An isochronal DSC thermogram detects three major exothermic transformation steps, with onset temperatures of 180, 292, and 327°C, respectively. Atom-probe analyses reveal the evolution of compositional inhomogeneities on an atomic scale. In addition to Ni-clusters present in the as-quenched alloy, Ni-Yb co-clusters form during isochronal heating to 188°C. Al-rich precipitates are detected after heating to 250°C, with the Ni and Ni-Yb clusters still present, constituting possible precursors of intermetallic phases formed during advanced transformation stages.

Original languageEnglish (US)
Pages (from-to)99-104
Number of pages6
JournalMaterials Science and Engineering A
Volume353
Issue number1-2
DOIs
StatePublished - Jul 25 2003

Keywords

  • Aluminum-nickel-ytterbium alloy
  • Amorphous and partially crystallized material
  • Clustering

ASJC Scopus subject areas

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

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