Enthalpy recovery and its effect on homogeneous flow stress during supercooled liquid region for Ti₄₀Zr₂₅Ni ₈Cu₉Be₁₈ bulk metallic glass

The homogeneous flow exhibits strain softening for Ti₄₀Zr ₂₅Ni₈Cu₉Be₁₈ bulk metallic glass, which is related to increase in free volume concentration based on free volume model. When metallic glass is pre-annealed above T_g before deformation, the trend of strain softening becomes slow with pre-annealing time, indicating that the enthalpy recovery contributes to strain softening, because the enthalpy of metallic glass will recover towards equilibrium value above T_g, and leads to increase in free volume concentration. So the strain softening for Ti₄₀Zr₂₅Ni₈Cu₉Be ₁₈ bulk metallic glass is related to enthalpy recovery.