Abstract
The onset of the glass transition (Tgonset) and crystallization (Tx) temperatures of Cu47.5Zr47.5Al5 and Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vitreloy 1) plates were investigated using conventional differential scanning calorimeter (DSC) and step-scan modulated differential scanning calorimeter (MDSC). A large scatter of the Tgonset values with error of ±6.9 K for Cu47.5Zr47.5Al5 and ±8.0 K for Vitreloy 1 have been observed, at a heating rate of 20 K/min using conventional DSC. Such variation is linked with the variation of the enthalpy change of the respective metallic glass up to different extent prior to the glass transition. Our investigation shows that the Tgonset values can be accurately estimated from the reversible heat flow curve with an error of ±0.6 K using step-scan MDSC analysis, which eliminates the effect of enthalpy change near to the glass transition.
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