Abstract
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.
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