Relaxation of Ni-free Ti₄₀Zr₁₀Cu₃₆Pd₁₄ bulk metallic glass under mechanical stress

Dynamic mechanical behavior of Ti₄₀Zr₁₀Cu₃₆Pd₁₄ bulk metallic glass was investigated by mechanical spectroscopy. The mechanical spectra of Ti₄₀Zr₁₀Cu₃₆Pd₁₄ bulk metallic glass show the main α relaxation while the slow β relaxation is not evident. The isothermal relaxation process of the loss factor tanδ can be well described by the Kohlrausch-Williams-Watts (KWW) stretched exponential relaxation function. In the current study, the stretched exponential relaxation parameter β_age remains constant below the glass transition temperature T_g, while the value increases when the temperature approaches T_g. In addition, atomic mobility of the Ti₄₀Zr₁₀Cu₃₆Pd₁₄ bulk metallic glass decreases during the physical aging.