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Structural changes in bulk metallic glass after annealing below the glass-transition temperature

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Publication Date
Volume
471
Identifiers
DOI: 10.1016/j.msea.2006.12.137
Keywords
  • Bulk Metallic Glasses
  • Neutron Diffraction
  • Structural Relaxation

Abstract

Abstract Small structural changes in bulk metallic glasses (BMGs) following thermal treatment below the glass-transition temperature were observed. Zr-based BMG ingots with nominal compositions of Zr 52.5Cu 17.9Ni 14.6Al 10.0Ti 5.0 (at.%) were isothermally annealed at 630 K for 10–60 min in vacuum and then cooled down. Structural relaxation was indicated by enthalpy evolution during differential scanning calorimetry and by changes in micro-hardness. Atomic structure was studied using time-of-flight neutron diffraction followed by a pair-distribution function (PDF) analysis. Observed changes in the PDF could not be explained by a “free volume” annealing, but were consistent with the elimination of short and long inter-atomic distances.

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