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Primary dendrite distribution in directionally solidified Sn–36 at.% Ni peritectic alloy

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Abstract

The primary dendrite arm spacing and its distribution at the solid–liquid interface has been examined in directionally solidified Sn–36 at.% Ni peritectic alloys under constant temperature gradient in a range of growth rates (2–200 μm/s). Statistical analysis of the primary dendrite arm spacing on transverse sections has been carried out using the minimum spanning tree and Voronoi polygon. The frequency distribution of the number of nearest neighbors determined by the Voronoi polygon suggested that the arrangement of dendrites at the solid–liquid interface could be visualized as hexagonal tessellation. The primary dendrite arm spacing determined by the conventional area counting method and minimum spanning tree all decreased with increasing growth rate, and a range of primary dendrite spacing was present during solidification. The range first increased with increasing growth rate, but when the growth rate exceeded 20 μm/s, it turned to decrease, which can be attributed to disorder induced by growth rate and interdendritic convection.

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ACKNOWLEDGMENTS

This project was supported by the National Natural Science Foundation of China (Grants No. 51071062, 51274077, and 51271068), Open Project of State Key Lab of Mold and Die Technology of Huazhong University of Science and Technology (Grant No. 2011-P03), The Fundamental Research Funds for the Central Universities (Grant No. HIT. NSRIF. 2013002), and Project 973 (Grant No. 2011CB610406).

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  1. Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, People’s Republic of China

    Peng Peng, Xinzhong Li, Yanqing Su, Dongmei Liu, Jingjie Guo & Hengzhi Fu

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  1. Peng Peng
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  2. Xinzhong Li
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  3. Yanqing Su
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Peng, P., Li, X., Su, Y. et al. Primary dendrite distribution in directionally solidified Sn–36 at.% Ni peritectic alloy. Journal of Materials Research 28, 740–746 (2013). https://doi.org/10.1557/jmr.2012.383

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