Abstract
By using nanoindentation techniques combined with transmission electron microscope, wide-/small-angle X-ray scattering, and three-dimensional atom probe tomography, the sub-nanometer- to nanometer-length-scale structural heterogeneity due to the precipitation of Co(Fe)-rich clusters was observed in [(Co0.7Fe0.3)0.68B0.219Si0.051Nb0.05]100-xCux (x = 0.5) metallic glasses. Such short-range ordered structure promotes energy dissipation during deformation via regulating intrinsic elastic constants and hardness at the mesoscale, which contributes to the improved compressive plasticity of Cu-doped (Fe, Co)-based metallic glasses. Our work provides new evidence on atomic-scale heterogeneity in Cu-doped metallic glasses from the aspects of topological orders and microscopic mechanical responses.
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