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Modeling of free eutectic growth and competitive solidification in undercooled near-eutectic alloys based on in situ measurements

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Abstract

Free eutectic growth and its competition with single-phase growth in solidification of undercooled near-eutectic alloys are not yet fully understood. In this paper, the historical development of eutectic growth models was reviewed. The LZ model of free eutectic growth was evaluated using recent data of eutectic growth velocities in an undercooled Ni81.3Sn18.7 eutectic composition. An excellent agreement was achieved between the LZ model and the data. Crystal growth velocities in off-eutectic Ni83Sn17 and Ni80Sn20 compositions were measured using a high-speed camera technique. The present data of the off-eutectic compositions and the recent data of the eutectic composition were modeled using the LZ model and the LKT/BCT model of free dendritic growth. The modeling revealed that the competition between the free eutectic growth and the single-phase growth is controlled by the highest interface temperature criterion. A coupled zone of the α-Ni-Ni3Sn eutectic was calculated using this criterion. The coupled zone agrees well with studies of solidified structures of undercooled samples.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (51071043) and by the Fundamental Research Funds for the Central Universities of Ministry of Education, China (N130509001). The authors thank Z. B. Xu, S. M. Zhang, B. X. Li and Y. J. Zhang for their assistance in the measurements of dendritic growth velocities. The authors also thank Dr. D. Holland-Moritz for reading the manuscript.

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  1. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang, 110004, Peoples’ Republic of China

    Chao Yang & Jianrong Gao

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  1. Chao Yang
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  2. Jianrong Gao
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Correspondence to Jianrong Gao.

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Yang, C., Gao, J. Modeling of free eutectic growth and competitive solidification in undercooled near-eutectic alloys based on in situ measurements. J Mater Sci 50, 268–278 (2015). https://doi.org/10.1007/s10853-014-8585-5

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  • DOI: https://doi.org/10.1007/s10853-014-8585-5

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