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Modeling of primary and secondary dendrites in a Cu-6 Wt Pct Sn alloy

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Abstract

Microstructure of gas-atomized CuSn6 particles has been investigated using scanning electron microscopy (SEM), and it is shown that the dendrite arm spacing (DAS) is related to the particle diameter (d) so that DAS=0.19d 0.72. Formation of microstructures in the particles are modeled using a numerical solidification model. This model concerns tips of cells and dendrites, but in the present investigation, it is, in a simple manner, extended to comprise whole cells and dendrites. Furthermore, ripening of dendrite arms is taken into consideration. It is found that for increasing growth rates there is a transition from dendrites to cells when the growth velocity approaches the diffusional velocity in the melt,i.e., when the Peclet number is equal to one. It is also shown that both primary stem spacing and dendrite spacing are related to the ratio between the volume in the liquid where there is solute diffusion and to the surface area of the cells and dendrites (D/A). The relation between spacing and D/A is the same for cells and dendrites, indicating that the spacing selection is controlled purely by solute diffusion in the melt.

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Author notes

  1. N. Tiedje (Postdoctoral Candidate, Risø National Laboratory)

    Present address: Georg Fischer DISA Technologies, DK-2730, Herlev, Denmark

  2. P. N. Hansen (Associate Professor, General Manager, Foundry Technology)

    Present address: Department of Thermal Processing of Materials, Technical University of Denmark, 2800, Lyngby, Denmark

Authors and Affiliations

  1. Georg Fischer DISA Technologies, Denmark

    P. N. Hansen (Associate Professor, General Manager, Foundry Technology)

  2. Risø National Laboratory, 4000, Roskilde, Denmark

    A. S. Pedersen (Associate Professor)

Authors
  1. N. Tiedje
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  2. P. N. Hansen
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  3. A. S. Pedersen
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Tiedje, N., Hansen, P.N. & Pedersen, A.S. Modeling of primary and secondary dendrites in a Cu-6 Wt Pct Sn alloy. Metall Mater Trans A 27, 4085–4093 (1996). https://doi.org/10.1007/BF02595657

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