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Elastic interaction-induced anisotropic growth of dislocation loop arrays

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Abstract

The elastic interactions and reactions of dislocations lead to the formation of complex dislocation substructures, which is critical to the strain hardening and fatigue failure. Phase field dislocation dynamics simulations are conducted as a first step to understand the elastic interactions between dislocation loops. When the interloop spacing is small, the elastic interactions with neighboring loops become strong, rendering the edge segments strongly pinned, while allowing for the screw segments to propagate more easily. The interactions are found to result in an anisotropic stress distribution around the dislocation loops, leading to the formation of arrays of long, straight edge dislocations that could act as barriers to subsequent slip. Furthermore, the effect of initial loop size and applied strain rate on the elastic interaction-induced anisotropic pinning effect is investigated and discussed. The results are important for coarse-graining dislocation substructures formation into continuum level models of deformation in crystalline solids.

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Acknowledgments

PC, TM, and LC acknowledges the financial support from National Science Foundation-CMMI Mechanics of Materials and Structures Program, under Grant No. 1727428. AH is grateful for support from the Materials Project within the Advanced Simulation and Computing (ASC), Physics and Engineering Model (PEM) Program at Los Alamos National Laboratory. YC is supported by National Natural Science Foundation of China under Grant Nos. 11972208 and 11921002.

Funding

PC, TM, and LC are supported by National Science Foundation-CMMI Mechanics of Materials and Structures Program, under Grant No. 1727428. YC is supported by National Natural Science Foundation of China under Grant No. 11972208 and 11921002.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Nevada, Reno, NV, 89557, USA

    Pranay Chakraborty, Tengfei Ma & Lei Cao

  2. Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China

    Yinan Cui

  3. X Computational Physics Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Abigail Hunter

Authors
  1. Pranay Chakraborty
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  2. Tengfei Ma
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  3. Yinan Cui
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  5. Lei Cao
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Contributions

PC conducted the simulations and processed the data under the supervision of LC. All authors discussed the data and wrote the manuscript.

Corresponding authors

Correspondence to Yinan Cui, Abigail Hunter or Lei Cao.

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Chakraborty, P., Ma, T., Cui, Y. et al. Elastic interaction-induced anisotropic growth of dislocation loop arrays. Journal of Materials Research 36, 3426–3435 (2021). https://doi.org/10.1557/s43578-021-00305-3

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