Dynamic mechanical behavior of (La_0.7Ce_0.3)₆₅Al₁₀Co₂₅ bulk metallic glass: Influence of the physical aging and heat treatment

Dynamic mechanical relaxation behavior of (La_0.7Ce_0.3)₆₅Al₁₀Co₂₅ bulk metallic glass was studied by using dynamic mechanical analysis (DMA). The experimental results demonstrated that (La_0.7Ce_0.3)₆₅Al₁₀Co₂₅ bulk metallic glass displays a pronounced slow β relaxation. Influence of the physical aging and heat treatment on the internal friction of the metallic glass were also analyzed. Physical aging below the glass transition temperature Tg and in-situ heat treatment introduce a decrease of the atomic mobility of metallic glasses, which is closely associated with the annihilation of defects (structural heterogeneity) of the metallic glasses.