Optimizing structural ordering degree to improve the mechanical reliability of metallic glasses

Abstract

This study systematically investigates the influences of annealing treatment on the energy state, microstructure and macroscopic mechanical behaviors of metallic glasses (MGs). By reducing the energy state, the annealing process significantly enhances the structural ordering degree and uniformity of MGs, thereby improving their overall mechanical reliability. Specifically, annealing promotes the formation of localized icosahedral short-range order, a structural signature that contributes to improved nanohardness and tensile strength. Furthermore, the release and redistribution of internal stress during annealing further optimize the internal stress state, significantly enhancing the fracture resistance and achieving reliable mechanical performance. This study not only elucidates the regulatory mechanisms of annealing on the microstructure of MGs but also provides theoretical support and experimental evidence for exploring MG materials with high strength and high fracture reliability.