Identification of true glass transitions in an Al-based metallic glass using temperature modulated differential scanning calorimetry

Al85Ni5Y8Co2 glassy ribbon was prepared by melt spinning. Two endothermic steps were observed on the differential scanning calorimetry (DSC) curve of the sample annealed at 215 °C for 30 min. Temperature modulated differential scanning calorimetry (TMDSC) data reveals that the “two endothermic steps” are related to overlapping of one single reversible endothermic process (glass transition) with a small exothermic peak, rather than two distinct glass transitions as a consequence of amorphous phase separation.