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Bian, Xilei; Wang, Gang; Wang, Qing; Sun, Baoan; Hussain, Ishtiaq; Zhai, Qijie; Mattern, Norbert; Bednarčík, Jozef; Eckert, Jürgen
Materials Research Letters, 20/7/4/, Letnik: 5, Številka: 4Report
The plasticity of metallic glasses depends largely on the atomic-scale structure. However, the details of the atomic-scale structure, which are responsible for their properties, remain to be clarified. In this study, in-situ high-energy synchrotron X-ray diffraction and strain-rate jump compression tests at different cryogenic temperatures were carried out. We show that the activation volume of flow units linearly depends on temperature in the non-serrated flow regime. A plausible atomic deformation mechanism is proposed, considering that the activated flow units mediating the plastic flow originate from the medium-range order and transit to the short-range order with decreasing temperature. IMPACT STATEMENT An atomic deformation mechanism in metallic glasses is proposed. Activated flow units mediating the plastic flow originate from the medium-range order and transit to the short-range order with decreasing temperature.
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