Abnormal sub-T-g enthalpy relaxation in the CuZrAl metallic glasses far from equilibrium

作者：Hu Lina^*; Yue Yuanzheng; Zhang Chunzhi

来源：Applied Physics Letters, 2011, 98(8): 081904.

DOI：10.1063/1.3556659

The sub-T-g enthalpy relaxation in glasses far from equilibrium (i.e., hyperquenched glasses) is usually manifested as a monotonic increase in both the onset temperature and the extent of enthalpy recovery with increasing the annealing temperature. Here we report an abnormal three-steplike relaxation pattern in hyperquenched Cu45Zr45Al10 and Cu48Zr48Al4 glasses below T-g, i.e., the usual monotonic increase is inverted when the annealing temperature increases to a critical value. This abnormal relaxation pattern could be attributed to the high extent of chemical heterogeneity in the CuZrAl supercooled liquids, and present a thermodynamic evidence for the dynamic fragile-to-strong transition in metallic glass-forming liquids.

• 出版日期2011-2-21
• 单位山东大学