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Coupled nucleation of dual-phase lamellar structure

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  • Gong Zheng and Yang Chen contributed equally

  • Corresponding authors: zxqi@njust.edu.cn (Z.Q.);  gchen@njust.edu.cn (G.C.)
    1. Coupled formation of lamellae is observed by identifying alternative segregation at lamellar interfaces.

      A coupled nucleation model is proposed for lamellar structure.

      Coupled nucleation and growth of lamellae is due to the smaller free energy barrier and interfacial anisotropy.

  • Although lamellar structures widely exist in materials, the existing nucleation knowledge has failed to describe the nucleation process of lamellae. This is because it involves the simultaneous formation of two different phases whose early-stage nuclei are always anisotropic and ordered. We report here a coupled nucleation of lamellae in a eutectoid TiAl system, demonstrating the coupled formation of a pair of anisotropic and ordered α2 + γ lamellae from the matrix, and each pair nucleates independently and heterogeneously. The coupled pair has been identified by alternative segregation of Nb in the interface using atom probe tomography. The nucleation kinetics have been confirmed by atomistic simulations and in situ high-energy synchrotron X-ray diffraction. A theoretical model has been proposed for this heterogeneously coupled nucleation, offering potential applications in various systems or phase transitions involving anisotropic, ordered, or lamellar structures. This coupled nucleation model represents a significant enhancement to the existing nucleation theory.
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  • Cite this article:

    Zheng G., Chen Y., Xiang H., et al., (2023). Coupled nucleation of dual-phase lamellar structure. The Innovation Materials 1(3), 100043. https://doi.org/10.59717/j.xinn-mater.2023.100043
    Zheng G., Chen Y., Xiang H., et al., (2023). Coupled nucleation of dual-phase lamellar structure. The Innovation Materials 1(3), 100043. https://doi.org/10.59717/j.xinn-mater.2023.100043

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