Abstract
The solidification of undercooled Ni–3.3 wt% B alloy was studied by high-speed video analysis and microstructural analysis. For moderate initial undercooling (ΔTp = 75 K), the solidification interface for primary phase transformation manifests a shape of a planar dendrite, and possesses an constant growth velocity, for eutectic transformation whereas the interface presents multi-dendrite shape and spasmodic growth, so that a constant velocity cannot describe the interface exactly. These differences suggest that primary phase solidification is controlled by far-distance diffusion while eutectic solidification by short-distance diffusion. For large initial undercooling (ΔTp = 262 K), a kinds of large “white dendrites”, which is in fact composed of multiple phases, were found in the microstructure, from inside to outside of which, the eutectic phase changes from dot phases (anomalous structure) to irregular eutectic and then to regular eutectic, indicating that the center of “white dendrites” may be the nucleation zone of eutectic reaction.
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ACKNOWLEDGMENTS
The authors are grateful for the National Basic Research Program of China (Nos. 2013CB632904 and 2011CB610403), the Natural Science Foundation of China (Nos. 51171136, 51301125, 51401156, and 51371133), the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2014JM6225), the Fund of Shaanxi Province Thin Film Technology and Optical Test Open Key Laboratory (No. ZSKJ201403) and the President fund of Xi’an Technological University (No. XAGDXJJ1307). J.F. Xu expresses thanks to S.J. Song, M.M. Gong, X.L. Xu, and S.B. Li for their help in this work.
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Xu, J., Zhang, D., Liu, F. et al. Multi-transformations in rapid solidification of highly undercooled hypoeutectic Ni–Ni3B alloy melt. Journal of Materials Research 30, 3307–3315 (2015). https://doi.org/10.1557/jmr.2015.295
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DOI: https://doi.org/10.1557/jmr.2015.295