Coupled nucleation of dual-phase lamellar structure

Gong Zheng; Yang Chen; Henggao Xiang; Jinpeng Zhang; K. N. Tu; Chenming Feng; Pei Li; Lin Song; Gang Sha; Zhixiang Qi; Guang Chen

doi:10.59717/j.xinn-mater.2023.100043

The Innovation Materials > 2023 Vol. 1 > No. 3 > 100043

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Coupled nucleation of dual-phase lamellar structure

1.
State Key Laboratory of Advanced Casting Technologies, MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, Engineering Research Center of Materials Behavior and Design, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, China
2.
Department of Materials Science and Engineering, University of California, Los Angeles CA 90095, USA
3.
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shanxi 710072, China
4.
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht D-21502, Germany

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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.)
Received Date: 08 October 2023

Accepted Date: 06 December 2023

Published Online: 11 December 2023

The Innovation Materials 1(3), https://doi.org/10.59717/j.xinn-mater.2023.100043 | Cite this article

GRAPHICAL ABSTRACT

GRAPHICAL ABSTRACT

PUBLIC SUMMARY

PUBLIC SUMMARY
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.

ABSTRACT

ABSTRACT

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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REFERENCES

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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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