Relation between β relaxation and fragility in LaCe-based metallic glasses

The studies of the dynamical mechanical properties of a series of (CexLa1-x)68Al10Cu20Co2 (where 0 ≤ x ≤ 1) metallic glasses show that the behaviors of β relaxation are closely correlated with the properties of their corresponding supercooled liquids. Metallic glasses quenched from fragile liquids show pronounced β relaxation humps whereas unobvious excess wings are associated with the metallic glasses quenched from strong liquids. Our result suggests he behaviors of β relaxations in the metallic glasses are correlated with the fragility of their supercooled liquids.