Correlation between deformation behavior and atomic-scale heterogeneity in Fe-based bulk metallic glasses

doi:10.1016/j.jmst.2020.04.081

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 [(Fe_0.5Co_0.5)_0.75B_0.2Si_0.05]₉₆Nb₄, Fe₃₉Ni₃₉B_14.2Si_2.75P_2.75Nb_2.3, 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.

Key words: Fe-based BMG, Plasticity, Serrated flow behavior, Atomic-scale, Heterogeneity

Jing Zhou, Siyi Di, Baoan Sun, Qiaoshi Zeng, Baolong Shen. Correlation between deformation behavior and atomic-scale heterogeneity in Fe-based bulk metallic glasses[J]. J. Mater. Sci. Technol., 2021, 65: 54-60.

Figures/Tables 9

Fig. 1. The σy and εp of typical Fe-based BMGs at room temperature.

Fig. 2. The compressive stress-strain curves of [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4, Fe39Ni39B14.2Si2.75P2.75Nb2.3, and Fe50Ni30P13C7 BMGs at room temperature.

Fig. 3. Plastic deformation region on stress-strain curve for (a) [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 BMG, (b) Fe39Ni39B14.2Si2.75P2.75Nb2.3 BMG, and (c) Fe50Ni30P13C7 BMG. (d), (e) and (f) is the enlarged stress-strain curve of steady-state deformation region in (a), (b) and (c), respectively.

Fig. 4. The enlarged transition region from stage Ⅰ to stage Ⅱ for (a) [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 BMG, (b) Fe39Ni39B14.2Si2.75P2.75Nb2.3 BMG, and (c) Fe50Ni30P13C7 BMG.

Fig. 5. A statistic results of stress drop for (a) [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 BMG, (b) Fe39Ni39B14.2Si2.75P2.75Nb2.3 BMG, and (c) Fe50Ni30P13C7 BMG, the increasing rate of serration size (△σmax/△ε) is the slop of the red line. The statistical distribution of the overall serration number at different serration sizes in (d) [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 BMG, (e) Fe39Ni39B14.2Si2.75P2.75Nb2.3 BMG, and (f) Fe50Ni30P13C7 BMG, the inset in (f) represent the corresponding power spectrum S(ω) ～ ω for Fe50Ni30P13C7 BMG.

Fig. 6. Synchrotron radiation XRD of [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4, Fe39Ni39B14.2Si2.75P2.75Nb2.3 and Fe50Ni30P13C7 BMGs.

Fig. 7. Synchrotron XRD results of Fe39Ni39B14.2Si2.75P2.75Nb2.3 and Fe50Ni30P13C7 BMGs. (a) Total structure factor S(Q), inset is the enlarge region on the first peak of S(Q) shown in (a) with dashed lines denoting the peak positions. (b) Reduced pair distribution function G(r), inset is the enlarged region on the G(r) function shown in (b) at r ≤ 2.0 ? with dashed lines denoting the slope of the curve in this low-r region.

Fig. 8. SEM images showing the shear band morphology of (a) [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 BMG, (b) Fe39Ni39B14.2Si2.75P2.75Nb2.3 BMG, and (c) Fe50Ni30P13C7 BMG.

Fig. 9. The relationships of serrated flow dynamics (average serration size), structural heterogeneity (increasing rate of serration size) and plasticity in Fe-based BMGs. Inset is the fracture morphology of [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4, Fe39Ni39B14.2Si2.75P2.75Nb2.3 and Fe50Ni30P13C7 BMGs shown in order from brittle to ductile, and the dominant fracture mechanism from brittle to ductile is also shown.

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