Correlation between deformation behavior and atomic-scale heterogeneity in Fe-based bulk metallic glasses. (28th February 2021)

• Record Type: Journal Article
• Authors: Zhou, Jing; Di, Siyi; Sun, Baoan; Zeng, Qiaoshi; Shen, Baolong
• Is Part Of: Journal of materials science & technology. Volume 65(2021)
• Page Start: 54
• Page End: 60
• Publication Date: 2021-02-28
• Subjects: Fe-based BMG -- Plasticity -- Serrated flow behavior -- Atomic-scale -- Heterogeneity; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2020.04.081
• Languages: English
• ISSNs: 1005-0302

Abstract

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 [(Fe0.5 Co0.5 )0.75 B0.2 Si0.05 ]96 Nb4, Fe39 Ni39 B14.2 Si2.75 P2.75 Nb2.3, and Fe50 Ni30 P13 C7 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.