Dynamic mechanical properties of a dual-phase Zr₂₈Y ₂₈Al₂₂Co₂₂ metallic glass

In order to investigate the mechanical relaxation behaviors of a Zr ₂₈Y₂₈Al₂₂Co₂₂ phase separating metallic glass, dynamic mechanical measurements of the tensile storage and loss moduli were performed for broad temperature and frequency ranges. The glass transition of each separated phase in the as-spun ribbon was manifested by the double decreasing of the storage modulus and two loss modulus peaks. The master curves for tanδ of the as-spun and heat-treated specimens were constructed according to the time-temperature superposition principle. From the temperature dependence of the shift factor, the activation energies for the primary and secondary relaxation of both specimens were calculated and the effects of the interconnected structure of the dual-phase as-spun ribbon and partially crystallized ribbon on the mechanical relaxation behaviors were studied.