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Nanocalorimetric Characterization of the Heterogeneous Nucleation of Rapidly Solidified Bismuth Droplets Embedded in a Zinc Matrix

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Abstract

In this paper, Zn-10Bi (wt.%) alloy with Bi droplets in size from micro- to nanometers embedded in the Zn matrix was prepared. Nanocalorimetry was used to investigate the melting and solidification behavior of the embedded Bi droplets. In the heating process, two endothermic peaks were observed attributing to the high sensitivity of the nanocalorimeter. One is close to the eutectic temperature of Zn-Bi alloy (527 K), while the other is close to the melting point of bulk Bi (544 K). In the cooling process, the Bi droplets solidify in a wide temperature range. The results demonstrate that the Bi droplets melt at the higher temperature but their solidification demand a larger undercooling. In addition, the nucleation kinetics of rapidly solidified nano-sized Bi droplets was studied based on the hemispherical cap model of heterogeneous nucleation, and the calculated results reveal the validity of classical heterogeneous nucleation theory in nano-scale at relative high cooling rates. In a word, due to the high sensitivity and large controllable cooling rate, nanocalorimetry will be a promising technique to investigate the rapid solidification behavior of embedded nano-sized droplets.

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Acknowledgements

This work is supported by the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning. Also, the National Natural Science Foundation of China (51171105, 50971086) and the 085 project in Shanghai University are acknowledged.

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Authors and Affiliations

  1. Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, 149 Yanchang Road, Shanghai, 200072, People’s Republic of China

    Linfang Li, Bingge Zhao, Quanliang Zhang, Qijie Zhai & Yulai Gao

  2. Institute of Physics, University of Rostock, Wismarsche Str. 43-45, 18051, Rostock, Germany

    Bin Yang

  3. Laboratory for Microstructures, Shanghai University, 99 Shangda Road, Shanghai, 200444, People’s Republic of China

    Yulai Gao

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  1. Linfang Li
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  2. Bingge Zhao
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  3. Bin Yang
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  4. Quanliang Zhang
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  5. Qijie Zhai
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Correspondence to Yulai Gao.

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Li, L., Zhao, B., Yang, B. et al. Nanocalorimetric Characterization of the Heterogeneous Nucleation of Rapidly Solidified Bismuth Droplets Embedded in a Zinc Matrix. JOM 67, 2881–2886 (2015). https://doi.org/10.1007/s11837-014-1214-6

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  • DOI: https://doi.org/10.1007/s11837-014-1214-6

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