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The deformation of metallic glasses is generally attributed to the rearrangements of local structures; however, the structural response mechanisms induced by different atomic bond types and cluster motifs during deformation remain unclear. To establish the correlation mechanism between atomic bonding characteristics and local structural evolution during metallic glass deformation, we employed pair distribution function (PDF) analysis of in-situ synchrotron high-energy X-ray total scattering to investigate the local structural evolution of metallic glasses with Pd77.5Cu6Si16.5metal-metalloid (M-Met) and Zr59(Cu0.55Fe0.45)33Al8 metalmetal (M-M) bonding during tensile deformation. Under elastic tensile strain, M-M systems exhibit reduced packing density in both short-range order (SRO) and medium-range order (MRO), and this process is dominated by the medium-range ordered structure, with the overall structure tending to disordering. By contrast, although the overall packing density of SRO and MRO in M-Met systems tends to decrease under strain, cooperative rearrangement of local bonds increases the SRO ordering and this ordering extends to the MRO regime. In the late stage of deformation, its structure gradually tends to disorder, and this response process is dominated by MRO structures. It is found that the bond type significantly affects the changes in interatomic correlation length and local order, thereby modulating microstructural heterogeneity and deformation behavior. These results provide new insight into the microstructural origins of deformation behavior in metallic glasses.
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Keywords:
- metallic glasses /
- atomic bond types /
- local structural heterogeneity /
- pair distribution function (PDF) analysis
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