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Thermal analysis, fragility and viscosity of Au-based metallic glasses
Ist Teil von
Journal of non-crystalline solids, 2010-09, Vol.356 (43), p.2218-2222
Ort / Verlag
Oxford: Elsevier B.V
Erscheinungsjahr
2010
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Metallic glasses based on Au of composition Au
49Cu
26.9Ag
5.5Pd
2.3Si
16.3 and (Au
49Cu
26.9Ag
5.5Pd
2.3Si
16.3)
99X
1 where X
=
Ti and In, have been produced and characterized in ribbon form. They show a glass transition and a rather wide undercooled liquid region before crystallisation.
The fragility index (
m) of the alloys was investigated with two methods involving differential scanning calorimetry (DSC) measurements. In one method the glass transition temperature was determined at different scanning rates in the range 0.3–100
°C/min and its trend fitted to give
m. In the other
m was obtained from the temperature span of the glass transition range at the scanning rate of 20
°C/min. Implications for viscosity in the undercooled liquid are derived and thoroughly discussed ending with a VFT (Vogel–Fulcher–Tammann) expression for it.