Abstract
The correlation betweent deformation behavior and atomic-scale heterogeneity of bulk metallic glasses (BMGs) is critical to understand the BMGs' deformation mechanism.In this work,three typical[(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4,Fe39Ni39B14.2Si2.75P2.75Nb2.3,and Fe50Ni30P13C7 BMGs exhibiting different plasticity were selected,and the correlation between deformation behavior and atomic-scale hetero-geneity of Fe-based BMGs was studied.It is found that the serrated flow dynamics of Fe-based BMGs transform from chaotic state to self-organized critical state with increasing plasticity.This transformation is attributed to the increasing atomic-scale heterogeneity caused by the increasing free volume and short-to-medium range order,which facilitates a higher frequency of interaction and multiplication of shear bands,thereby results in a brittle to ductile transition in Fe-based BMGs.This work provides new evidence on heterogeneity in plastic Fe-based BMGs from the aspects of atomic-scale structure,and provides new insight into the plastic deformation of Fe-based BMGs.
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