Thermal expansion of a La-based bulk metallic glass: insight from in situ high-energy x-ray diffraction

Constant-rate heating experiments using a fast x-ray camera (time resolution of 2.7 s) reveal detailed information about the thermal stability of La sub(62)Al sub(14)(Cu sub(5/6)Ag sub(1/6)) sub(14)Ni sub(5)Co sub(5) (at.%) bulk metallic glass. Analyzing diffraction patterns in reciprocal space yiel...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2011-06, Vol.23 (25), p.254204-8
Main Authors: Bednarcik, J, Michalik, S, Sikorski, M, Curfs, C, Wang, X D, Jiang, J Z, Franz, H
Format: Article
Language:English
Subjects:
Amorphous materials
Condensed matter
Diffraction
Glass transition
Heating
Metallic glasses
Thermal expansion
X-rays
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Summary:Constant-rate heating experiments using a fast x-ray camera (time resolution of 2.7 s) reveal detailed information about the thermal stability of La sub(62)Al sub(14)(Cu sub(5/6)Ag sub(1/6)) sub(14)Ni sub(5)Co sub(5) (at.%) bulk metallic glass. Analyzing diffraction patterns in reciprocal space yields the thermal expansion of the amorphous alloy providing insight into the thermally activated relaxation effects and kinetics of the glass transition. The glass transition appears as a break in the value of the coefficient of volume thermal expansion. Furthermore, real space analysis based on the reduced pair distribution function G(r ) allows one to follow in situ the changes in the local atomic structure of the amorphous material during constant-rate heating.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/23/25/254204