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In Situ Observation of the Competition Between Metastable and Stable Phases in Solidification of Undercooled Fe-17at. pctB Alloy Melt

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Abstract

High-speed video (HSV) technique was used to investigate the solidification behavior of undercooled Fe-17at. pctB alloy melt. Competitive growth between Fe/Fe3B (metastable eutectic) and Fe/Fe2B (stable eutectic) was captured, which is correlated with the critical nucleation undercooling \( \Delta T_{n}^{*} \)[=104 K (104 °C)] and the critical growth undercooling \( \Delta T_{\text{g}}^{*} \)[=151 K~183 K (151 °C~183 °C)]. For the initial undercooling, \( \Delta T < \Delta T_{n}^{*} \), only the stable eutectic reaction (L → Fe/Fe2B) occurs during solidification, whereas, for \( \Delta T > \Delta T_{n}^{*} \), the metastable eutectic reaction (L → Fe/Fe3B) occurs firstly, followed by the stable eutectic reaction. Nevertheless, \( \Delta T > \Delta T_{n}^{*} \) does not guarantee that the metastable phase (Fe3B) appears finally. Only if \( \Delta T > \Delta T_{\text{g}}^{*} \), Fe3B phase can be found in the room microstructure, as the growth velocity of metastable eutectic (Fe/Fe3B) is larger than stable eutectic (Fe/Fe2B) from HSV results; otherwise, the final structure consists of Fe2B and α-Fe. Accordingly, not only the competitive nucleation, but the competitive growth also determines the final microstructure of Fe-17at. pctB alloy.

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Acknowledgments

The authors are grateful for the financial support of the National Basic Research Program of China (Nos. 2011CB610403 and 2011CB632904), the China National Funds for Distinguished Young Scientists (No. 51125002), the Natural Science Foundation of China (Nos. 51431008, 51401156 and 51134011), the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2014JM6225), the President fund of Xi’an Technological University (No. XAGDXJJ1307) and the Fundamental Research Fund of Northwestern Polytechnical University (No. JC20120223). D. Zhang is also appreciates C.Y. Hu, K. Wang and Z.W. Zhu for their help in this work.

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Authors and Affiliations

  1. Materials Processing Engineering, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, P.R. China

    Di Zhang (Master) & Feng Liu (Professor)

  2. Metal Material Engineering, Department of Metal Material Engineering, Xi’an Technological University, Xi’an, 710021, P.R. China

    Junfeng Xu (Doctor)

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  1. Di Zhang
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  2. Junfeng Xu
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  3. Feng Liu
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Correspondence to Junfeng Xu or Feng Liu.

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Manuscript submitted January 29, 2015.

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Zhang, D., Xu, J. & Liu, F. In Situ Observation of the Competition Between Metastable and Stable Phases in Solidification of Undercooled Fe-17at. pctB Alloy Melt. Metall Mater Trans A 46, 5232–5239 (2015). https://doi.org/10.1007/s11661-015-3104-0

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