Annealing-induced evolution in the structure and nano-scale creep properties of a Ti-based metallic glass

The distinctive atomic configuration of metallic glasses (MGs) engender superior mechanical properties, with creep behaviors being particularly determinant for high-temperature service. In this study, the influence of annealing on the microstructure, and the creep behaviors of Ti₄₀Zr₂₅Ni₃Cu₁₂Be₂₀ MG have been investigated, combined with transmission electron microscope and nanoindentation tests. Annealing below the glass transition temperature induces progressive enhancement of the creep resistance with increasing the annealing temperature. The improvement in creep resistance can be explained by changes in the local ordering degree. Furthermore, at the same annealing temperature, the increase in the stress exponent indicates a transition toward more inhomogeneous plastic flow behavior with increasing the holding loads. This study provides further understanding on the creep deformation behaviors of Ti-based MGs after annealing.