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Evolution of dislocations during the rapid solidification in additive manufacturing

Author

Listed:
  • Lin Gao

    (University of Virginia
    Argonne National Laboratory)

  • Yan Chen

    (Oak Ridge National Laboratory)

  • Xuan Zhang

    (Argonne National Laboratory)

  • Sean R. Agnew

    (University of Virginia)

  • Andrew C. Chuang

    (Argonne National Laboratory)

  • Tao Sun

    (University of Virginia
    Northwestern University)

Abstract

Materials processed by fusion-based additive manufacturing (AM) typically exhibit relatively high dislocation densities, along with cellular structures and elemental segregation. This representative structural feature significantly influences material performance; however, post-mortem microstructure characterizations of AM materials cannot capture the dynamic evolution of dislocations during the manufacturing process, thereby offering limited mechanism-based guidance for further advancing AM techniques and facilitating the qualification and certification of AM products. In this study, we conduct operando high-energy synchrotron X-ray diffraction experiments on wire-laser directed energy deposition of 316 L stainless steel. Through a unique configuration, our operando synchrotron experiments semi-quantitatively probe the dislocation density in solid phases and their dynamic changes during solidification and subsequent cooling. By integrating this advanced synchrotron technique with multi-physics simulation, in-situ neutron diffraction, and multi-scale electron microscopy characterization, our mechanistic study aims to elucidate the effects of rapid cooling and subsequent thermal cycling on the dislocation generation and evolution.

Suggested Citation

  • Lin Gao & Yan Chen & Xuan Zhang & Sean R. Agnew & Andrew C. Chuang & Tao Sun, 2025. "Evolution of dislocations during the rapid solidification in additive manufacturing," Nature Communications, Nature, vol. 16(1), pages 1-13, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59988-5
    DOI: 10.1038/s41467-025-59988-5
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