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Effect of Solute Diffusion on Dendrite Growth in the Molten Pool of Al-Cu Alloy

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Abstract

A cellular automaton (CA)–finite difference model is developed to simulate dendrite growth and solute diffusion during solidification process in the molten pool of Al-Cu alloy. In order to explain the interaction between the dendritic growth and solute distribution, a series of CA simulations with different solute diffusion velocity coefficients are carried out. It is concluded that the solute concentration increases with dendrite growing and solute accumulation in the dendrite tip. Converged value of the dendrite tip growth velocity is about 480 μm/s if the mesh size is refined to 2 μm or less. Growth of the primary dendrite and the secondary dendrite is mainly influenced by solute diffusion at the dendrite tips. And growth of secondary and tertiary dendrites is mainly influenced by solute diffusion at interdendrite.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (Grant No. U1637103).

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Authors and Affiliations

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China

    Xiaohong Zhan, Yun Liu & Yanhong Wei

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  1. Xiaohong Zhan
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  2. Cheng Gu
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  3. Yun Liu
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  4. Yanhong Wei
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Correspondence to Xiaohong Zhan.

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Manuscript submitted January 10, 2017.

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Zhan, X., Gu, C., Liu, Y. et al. Effect of Solute Diffusion on Dendrite Growth in the Molten Pool of Al-Cu Alloy. Metall Mater Trans B 48, 2685–2694 (2017). https://doi.org/10.1007/s11663-017-1056-z

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