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Vortex Evolution Behavior in Self-Assembly of Flow Units in Metallic Glasses

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Abstract

Shear banding in amorphous metals originates from the activation and percolation of flow units. To uncover the self-assembly dynamics of flow units in metallic glasses, a rectangular sample with two flow units embedded in the matrix undergoing simple shearing was analyzed using finite element simulations. The vortex evolution behavior, including activation, growth, and collapse during the self-assembly of flow units, was revealed. It was found that the formation of a mature vortex indicates the onset of yielding, and the collapse of the vortex represents the percolation of flow units or shear localization. The effects of initial free volume distribution and the distance between flow units on vortex behavior were also studied. Increasing the initial free volume concentration within flow units or the matrix leads to a gentler vortex evolution process and better homogeneous plasticity. The shape of vortex tends to be "flatter" with the increase in flow units’ spacing, and the optimal spacing was found to maximize the strength of the material.

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Acknowledgements

This work is supported by the NSFC (Nos. 11972346 and 11790292), and the NSFC Basic Science Center Program for ''Multi-scale Problems in Nonlinear Mechanics'' (No. 11988102).

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Authors and Affiliations

  1. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China

    Jie Lian, Ruyue Song, Yan Chen & Lanhong Dai

  2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China

    Jie Lian, Ruyue Song, Yan Chen & Lanhong Dai

Authors
  1. Jie Lian
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  2. Ruyue Song
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  3. Yan Chen
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  4. Lanhong Dai
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Contributions

JL contributed to simulation and writing—original draft. RS contributed to simulation and writing—original draft. YC contributed to conceptualization, analyses, supervision, and writing—original draft, review and editing. LD contributed to writing—review and editing.

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Correspondence to Yan Chen.

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Lian, J., Song, R., Chen, Y. et al. Vortex Evolution Behavior in Self-Assembly of Flow Units in Metallic Glasses. Acta Mech. Solida Sin. 36, 603–611 (2023). https://doi.org/10.1007/s10338-023-00409-9

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  • DOI: https://doi.org/10.1007/s10338-023-00409-9

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