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<p>Metallic glasses (MGs) possess the merits of high strength and a large elastic limit. However, they suffer from little tensile ductility in the inhomogeneous deformation regime due to strain softening and shear localization. In this work, we report a substantial increase in tensile plastic strain (<i>ε</i><sub>p</sub>) from 2.8% to 10% in a Fe-based metallic glass (MG) via non-affine thermal strain (NTS), accompanied by a significant intensity enhancement and a considerable decrease in activation energy (32%) of the <i>β</i>-relaxation. Notably, pronounced strain hardening is observed during tension. These extraordinary tensile properties are structurally attributed to the NTS-promoted formation of a chemical-fluctuation-mediated network structure consisting of interconnected Fe-rich medium-range orders (MROs) and surrounding metalloid-rich clusters, as well as the subsequent temperature and stress-induced unique evolution of the multiscale structural heterogeneities. Specifically, the stress-induced unique MRO formation, α-Fe nanocrystallization, and the irreversible relaxation-induced structural ordering jointly interact with shear banding to transform strain softening into hardening, leading to excellent ductility. These findings demonstrate that simultaneous relaxation-assisted and transformation-mediated deformation stabilizes the inhomogeneous plastic flow under tension, overcoming the ductility bottleneck of MGs.</p>

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Transformation-mediated and relaxation-assisted macroscopic tensile plasticity with strain-hardening in metallic glass

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月19日

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  • Fan Hu,
  • Qiang Luo,
  • Mingjuan Cai,
  • Qianqian Wang,
  • Jingxian Cui,
  • Yusha Luo,
  • Bo Sun,
  • Zhijun Guo,
  • Baolong Shen

摘要

Metallic glasses (MGs) possess the merits of high strength and a large elastic limit. However, they suffer from little tensile ductility in the inhomogeneous deformation regime due to strain softening and shear localization. In this work, we report a substantial increase in tensile plastic strain (εp) from 2.8% to 10% in a Fe-based metallic glass (MG) via non-affine thermal strain (NTS), accompanied by a significant intensity enhancement and a considerable decrease in activation energy (32%) of the β-relaxation. Notably, pronounced strain hardening is observed during tension. These extraordinary tensile properties are structurally attributed to the NTS-promoted formation of a chemical-fluctuation-mediated network structure consisting of interconnected Fe-rich medium-range orders (MROs) and surrounding metalloid-rich clusters, as well as the subsequent temperature and stress-induced unique evolution of the multiscale structural heterogeneities. Specifically, the stress-induced unique MRO formation, α-Fe nanocrystallization, and the irreversible relaxation-induced structural ordering jointly interact with shear banding to transform strain softening into hardening, leading to excellent ductility. These findings demonstrate that simultaneous relaxation-assisted and transformation-mediated deformation stabilizes the inhomogeneous plastic flow under tension, overcoming the ductility bottleneck of MGs.