The effect of low-temperature structural relaxation on free volume and chemical short-range ordering in a Au49Cu26.9Si16.3Ag5.5Pd2.3 bulk metallic glass

Structural changes due to low-temperature relaxation in a Au49Cu26.9Si16.3Ag5.5Pd2.3 bulk metallic glass are investigated with a combination of positron annihilation lifetime spectroscopy (PALS) and high-intensity synchrotron X-ray scattering. The free volume content of the glass remains unaffected...

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Bibliographic Details
Published in:Scripta materialia 2015-07, Vol.103, p.14-17
Main Authors: Evenson, Zach, Koschine, Tönjes, Wei, Shuai, Gross, Oliver, Bednarcik, Jozef, Gallino, Isabella, Kruzic, Jamie J., Rätzke, Klaus, Faupel, Franz, Busch, Ralf
Format: Article
Language:English
Subjects:
Amorphous materials
Annealing
Bulk metallic glass
Metallic glasses
Origins
Positron annihilation
Relaxation
Short range order
Synchrotron radiation
Synchrotrons
X-ray diffraction
X-rays
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Summary:Structural changes due to low-temperature relaxation in a Au49Cu26.9Si16.3Ag5.5Pd2.3 bulk metallic glass are investigated with a combination of positron annihilation lifetime spectroscopy (PALS) and high-intensity synchrotron X-ray scattering. The free volume content of the glass remains unaffected during annealing at 50°C while distinct changes in the chemical short-range order occur on a nearest-neighbor length scale of ∼3Å. A highly localized process of atomic rearrangement is envisioned, which may help to understand the microscopic origin of the β-relaxation.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2015.02.026