Correlation between deformation behavior and atomic-scale heterogeneity in Fe-based bulk metallic glasses
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第6期
论文作者：Jing Zhou Siyi Di Baoan Sun Qiaoshi Zeng Baolong Shen
摘 要：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, Fe39Ni39B14.2 Si2.75 P2.75 Nb2.3, and Fe50Ni30P13C7 BMGs exhibiting different plasticity were selected, and the correlation between deformation behavior and atomic-scale heterogeneity 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.
Jing Zhou1，Siyi Di1，Baoan Sun2，Qiaoshi Zeng1，Baolong Shen1,3
1. School of Materials Science and Engineering, Jiangsu Key Laboratory for Advanced Metallic Materials, Southeast University2. Institutes of Physics, Chinese Academy of Sciences3. Institute of Massive Amorphous Metal Science, China University of Mining and Technology
摘 要：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, Fe39Ni39B14.2 Si2.75 P2.75 Nb2.3, and Fe50Ni30P13C7 BMGs exhibiting different plasticity were selected, and the correlation between deformation behavior and atomic-scale heterogeneity 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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