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Microsegregation during Solidification of an Al-Cu Binary Alloy at Largely Different Cooling Rates (0.01 to 20,000 K/s): Modeling and Experimental Study

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Abstract

Microsegregation in the Al 4 wt pct Cu alloy was investigated experimentally in a large range of cooling rates from 0.01 to 20,000 K/s using different solidification techniques. The microstructure was modeled using two-dimensional (2-D) pseudo-front tracking (PFT) developed by Jacot and co-workers. The experimentally determined amount of nonequilibrium eutectics increases with the cooling rate in the range 0.01 to 3 K/s and then decreases in the range 20 to 20,000 K/s. The fraction of eutectic calculated from the 2-D PFT model shows not only the same tendency, but also agrees quantitatively very well with the experiments over the range of cooling rates. It can also be explained qualitatively how the observed in terms of coarsening of the secondary dendrite arms and the back diffusion in the way both depend on the local solidification time.

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Acknowledgments

This work was performed within the framework of the research program of Virtual Institute for VIrtual MATerials design (VIVIMAT). The authors thank Dr. M. Kolbe, for the fruitful discussion about the definition of cooling rate in the drop tube facility and for helping in the microstructure analysis with SEM, and Mr. F. Schmidt-Hohagen, whose temperature measurements in the molds gave the background for definition of the cooling rate by the mold casting experiments. The authors are grateful to Dr. A. Jacot for numerous and fruitful explanations regarding the PFT model and its functioning as implemented in a CALCOSOFT code.

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Authors and Affiliations

  1. Institute of Materials Physics in Space, DLR, 51147, Cologne, Germany

    Galina Kasperovich, Thomas Volkmann, Lorenz Ratke (Professor) & Dieter Herlach (Professor)

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  1. Galina Kasperovich
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  2. Thomas Volkmann
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  3. Lorenz Ratke
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  4. Dieter Herlach
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Correspondence to Galina Kasperovich.

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Manuscript submitted April 19, 2007.

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Kasperovich, G., Volkmann, T., Ratke, L. et al. Microsegregation during Solidification of an Al-Cu Binary Alloy at Largely Different Cooling Rates (0.01 to 20,000 K/s): Modeling and Experimental Study. Metall Mater Trans A 39, 1183–1191 (2008). https://doi.org/10.1007/s11661-008-9505-6

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