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Solidification of Highly Undercooled Hypereutectic Ni-Ni3B Alloy Melt

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Abstract

The solidification of undercooled Ni-4.5 wt pct B alloy melt was investigated by using the glass fluxing technique. The alloy melt was undercooled up to ΔT p ~ 245 K (245 °C), where a mixture of α-Ni dendrite, Ni3B dendrite, rod eutectic, and precipitates was obtained. If ΔT p < 175 K ± 10 K (175 °C ± 10 °C), the solidification pathway was found as primary transformation and eutectic transformation (L → Ni3B and L → Ni/Ni3B); if ΔT p ≥ 175 K ± 10 K (175 °C ± 10 °C), the pathway was found as metastable eutectic transformation, metastable phase decomposition, and residual liquid solidification (L → Ni/Ni23B6, Ni23B6 → Ni/Ni3B, and Lr → Ni/Ni3B). A high-speed video system was adopted to observe the solidification front of each transformation. It showed that for residual liquid solidification, the solidification front velocity is the same magnitude as that for eutectic transformation, but is an order of magnitude larger than for metastable eutectic transformation, which confirms the reaction as Lr → Ni/Ni3B; it also showed that this velocity decreases with increasing ΔT r, which can be explained by reduction of the residual liquid fraction and decrease of Ni23B6 decomposition rate.

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Acknowledgments

The authors are grateful for the financial support of the China National Funds for Distinguished Young Scientists (Grant No. 51125002), the National Basic Research Program of China (973 Program, Nos. 2011CB610403 and 2011CB632904), the Natural Science Foundation of China (Nos. 51101122, 51134011, 51171136, 51071127, and 51071115), the Free Research Fund of State Key Laboratory of Solidification Processing (No. 66-QP-2010), the 111 project (No. B08040), the President Fund of Xi’an Technological University (Grant No. XAGDXJJ1307), and the Fund of Shaanxi Province Thin Film Technology and Optical Test Open Key Laboratory (Grant No. ZSKJ201403). J.F. Xu thanks C.Y. Hu, J.W. Xu, X.L. Xu, and S.B. Li for their help with this work.

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Authors and Affiliations

  1. Materials Processing Engineering, The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi’an Technological University, Xi’an, 710021, P.R. China

    Feng Liu (Professor), Junfeng Xu (Professor) & Zengyun Jian (Professor)

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

    Feng Liu (Professor) & Di Zhang (Master)

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  1. Feng Liu
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  2. Junfeng Xu
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  4. Zengyun Jian
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Correspondence to Feng Liu or Junfeng Xu.

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Manuscript submitted October 4, 2013.

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Liu, F., Xu, J., Zhang, D. et al. Solidification of Highly Undercooled Hypereutectic Ni-Ni3B Alloy Melt. Metall Mater Trans A 45, 4810–4819 (2014). https://doi.org/10.1007/s11661-014-2460-5

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