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Convective effect on the solidification of hypermonotectic alloys

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Abstract

A model is developed to analyze the microstructure evolution in a continuously solidified hypermonotectic alloy. The model takes into account the common actions of the nucleation and diffusional growth/shrinkage of the minority phase droplets, the spatial phase segregation, and the convections of the melt. The microstructure formation in a continuously solidified hypermonotectic alloy is calculated. The numerical results demonstrate that the convections have great effect on the microstructure formation. The convective flow against the solidification direction causes an increase in the nucleation rate while the convective flow along the solidification direction causes a decrease in the nucleation rate of the minority phase droplets. The convections lead to a more nonuniform distribution of the minority phase droplets in the melt. It causes an increase in the size of the largest minority phase droplets and is against the obtaining of the hypermonotectic alloys with a well-dispersed microstructure.

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ACKNOWLEDGMENT

The authors are grateful for financial support from the National Natural Science Foundation of China (Nos. 51031003, 51071159, and u0837601).

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Authors and Affiliations

  1. Shenyang Ligong University, Shenyang, 110159, China

    Haili Li

  2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Jiuzhou Zhao

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  1. Haili Li
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  2. Jiuzhou Zhao
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Correspondence to Jiuzhou Zhao.

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Li, H., Zhao, J. Convective effect on the solidification of hypermonotectic alloys. Journal of Materials Research 26, 832–836 (2011). https://doi.org/10.1557/jmr.2011.19

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