Journal
SCRIPTA MATERIALIA
Volume 164, Issue -, Pages 121-125Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.02.002
Keywords
High entropy; Bulk metallic glass; Strain rate sensitivity
Categories
Funding
- Natural Science Foundation of China [51801161]
- Initiative Postdocs Supporting Program [BX20180256]
- China Postdoctoral Science Foundation [2018M641016]
- Huo Yingdong Young Teacher Fund [151048]
- Science Fund for Distinguished Young Scholars from Shaanxi Province [2018-JC007]
- Fundamental Research Funds for the Central Universities
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A series of nanoindentation tests were performed on a high entropy bulk metallic glass (HE-BMG). At low peak loads, high positive strain rate sensitivity was found. But increasing the peak-load, the sensitivity of hardness to strain rate decreased dramatically. At low peak-loads, sluggish diffusion in HE-BMG significantly impedes atomic arrangement in the shear yielding events, whereas at high peak-loads, the shear-band deformation is dominated by the shear front triggered events. The work showed the origin of strain rate sensitivity in HE-BMGs and might help for tailoring the mechanical properties. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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