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

摘要

Al_(85)Ni_5Y_8Co_2 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 deg 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.