Abstract
Most metallic glasses (MGs) exhibit weak evidence of slowβ-relaxation in their dynamic mechanical spectroscopy spectra. In contrastto other MGs, the La-based MGs we report here show a distinct slowβ-relaxation peak in the mechanical relaxation measurements. We find that the slowβ-relaxation behavior can be tuned by modification of the chemicalcomposition and fragility. The structural origin of the slowβ-relaxation andcorrelation between β-relaxation and α-relaxation in the MGs are also discussed. MGs with pronounced slowβ-relaxation and tunable properties might provide a model system to investigate somelong-standing issues in the glass field.
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