Experimental analysis to the structural relaxation of Ti₄₈Zr₂₀V₁₂Cu₅Be₁₅ metallic glass matrix composite

The mechanical relaxation characteristics of in-situ Ti₄₈Zr₂₀V₁₂Cu₅Be₁₅ metallic glass matrix composite with dendrites reinforced are investigated by using mechanical spectroscopy. An abnormal internal friction behavior below the glass transition temperature is detected. Considering the irreversible feature and based on the transmission electron microscopy analysis, the abnormal internal friction behavior is mainly induced by the precipitation of nanocrystals in the dendritic phase. In order to understand better the dynamic mechanical properties of the Ti₄₈Zr₂₀V₁₂Cu₅Be₁₅ metallic glass matrix composite, the kinetic characteristics of glass transition are analyzed in the framework of quasi-point defects theory. In addition, an isothermal annealing conducted at lower than the glass transition temperature induces a significant change on both modulus and loss factor, the kinetics of relaxation under annealing can be well described by the stretched exponential relaxation equation.