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Migration of solidification grain boundaries and prediction

Author

Listed:
  • Hongmei Liu

    (Southwest Jiaotong University
    Sichuan University
    The University of Auckland)

  • Shenglu Lu

    (RMIT University)

  • Yingbo Zhang

    (Southwest Jiaotong University)

  • Hui Chen

    (Southwest Jiaotong University)

  • Yungui Chen

    (Sichuan University)

  • Ma Qian

    (RMIT University)

Abstract

Solidification processing is essential to the manufacture of various metal products, including additive manufacturing. Solidification grain boundaries (SGBs) result from the solidification of the last liquid film between two abutting grains of different orientations. They can migrate, but unlike normal GB migration, SGB migration (SGBM) decouples SGBs from solidification microsegregation, further affecting material properties. Here, we first show the salient features of SGBM in magnesium-tin alloys solidified with cooling rates of 8−1690 °C/s. A theoretical model is then developed for SGBM in dilute binary alloys, focusing on the effect of solute type and content, and applied to 10 alloy systems with remarkable agreement. SGMB does not depend on cooling rate or time but relates to grain size. It tends to occur athermally. The findings of this study extend perspectives on solidification grain structure formation and control for improved performance (e.g. hot or liquation cracking during reheating, intergranular corrosion or fracture).

Suggested Citation

  • Hongmei Liu & Shenglu Lu & Yingbo Zhang & Hui Chen & Yungui Chen & Ma Qian, 2022. "Migration of solidification grain boundaries and prediction," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33482-8
    DOI: 10.1038/s41467-022-33482-8
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    References listed on IDEAS

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    1. S. Torquato & Y. Jiao, 2009. "Dense packings of the Platonic and Archimedean solids," Nature, Nature, vol. 460(7257), pages 876-879, August.
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