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Modeling of dendrite arm fragmentation and dendrite arm coarsening⋆

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Abstract.

A two-dimensional quantitative cellular automaton (CA) model is employed to simulate dendrite arm fragmentation and dendrite arm coarsening in mushy zones. The phenomenon of dendrite arm fragmentation of an Al-Cu alloy during heating is well represented by the CA simulation, and it is analyzed in detail by comparing the local actual concentration and local equilibrium concentration. The CA simulations for the dendritic microstructures of SCN-ACE alloys during isothermal holding in a mushy zone reproduce the typical dendrite coarsening features as observed in experiments. The effects of holding temperature and alloy composition on the microstructures and dendrite coarsening kinetics are investigated. It is found that the melting of small dendrite arms and interdendritic groove advancement are the two main mechanisms in dendrite coarsening. The mechanism of coalescence by joining arm tips is more likely to take place at a lower temperature or for a lower alloy composition, while the dendrite arm fragmentation mechanism tends to occur at a higher temperature. The coarsening rate constant is found to decrease with increasing holding temperature and alloy composition.

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, 211189, Nanjing, China

    Hui Fang, Hua Xue, Mengdan Hu & Mingfang Zhu

  2. Shagang School of Iron and Steel, Soochow University, 215137, Suzhou, China

    Qingyu Zhang

  3. School of Materials Science and Engineering, Nanjing University of Science and Technology, 210094, Nanjing, China

    Shiyan Pan

Authors
  1. Hui Fang
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  2. Hua Xue
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  3. Qingyu Zhang
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  4. Shiyan Pan
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  5. Mengdan Hu
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  6. Mingfang Zhu
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Correspondence to Mingfang Zhu.

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Fang, H., Xue, H., Zhang, Q. et al. Modeling of dendrite arm fragmentation and dendrite arm coarsening⋆. Eur. Phys. J. E 43, 44 (2020). https://doi.org/10.1140/epje/i2020-11968-5

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