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Phase-Field Simulation of Concentration and Temperature Distribution During Dendritic Growth in a Forced Liquid Metal Flow

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Abstract

A phase-field model with convection is employed to investigate the effect of liquid flow on the dendritic structure formation of a Ni-Cu alloy during rapid solidification. Temperature and solute diffusion are significantly changed with induced liquid metal flow, and distribution changes of concentration and temperature are also analyzed and discussed. The solute segregation is affected due to the concentration diffusion layer thickness change caused by the liquid flow. The flow reduces the solute segregation in the upstream and leads to a fast dendrite growing, while solidifying in the downstream gets constrained with the large solute diffusion layer. Increasing flow velocity increases the asymmetry of dendrite morphology with much more suppressed growth in the downstream. The temperature distribution is also asymmetrical due to the non-uniform latent heat released during solidification coupling with heat diffusion changed by the liquid flow. Therefore, the forced liquid flow significantly affects the dendrite morphology, concentration, and temperature distributions in the solidifying microstructure.

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Acknowledgment

The authors would like to thank the financial support from the NPU Foundation of Fundamental Research, China (No. JC201272).

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Authors and Affiliations

  1. Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Northwestern Polytechnical University, Xi’an, 710072, P. R. China

    Lifei Du (Ph.D. Candidate) & Rong Zhang (Professor)

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  1. Lifei Du
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  2. Rong Zhang
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Correspondence to Lifei Du.

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Manuscript submitted April 14, 2014.

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Du, L., Zhang, R. Phase-Field Simulation of Concentration and Temperature Distribution During Dendritic Growth in a Forced Liquid Metal Flow. Metall Mater Trans B 45, 2504–2515 (2014). https://doi.org/10.1007/s11663-014-0161-5

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