Solidification of undercooled Ni-4.5 wt% B alloy melt was investigated by glass fluxing and cyclic superheating. A maximum melt undercooling up to ΔTp = 283 K has been achieved. If ∆Tp < 175 ± 10 K, the primary solidification is L → Ni3B; the structure consists of Ni3B dendrite + lamellar eutectic; the phase sizes and fractions depend on ∆Tp. If ∆Tp ≥ 175 ± 10 K, the primary solidification is L → Ni/Ni23B6; the structure consists of the dot-phase region + the anomalous eutectic/network boundary; the phase fractions mainly depend on ∆Tr; the dot phases are determined as rod eutectic and dot precipitates, while the network boundary is the divorced eutectic. The solidification pathways show that there is a common critical nucleation temperature, 1227 ± 10 K, for metastable eutectic reaction in hypoeutectic and hypereutectic Ni-Ni3B alloys.
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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, Grant No. 2011CB610403), the Natural Science Foundation of China (Grant Nos. 50901059, 51071127, 51171136, and 51301125), the President fund of Xi’an Technological University (XAGDXJJ1307), and the 111 project (project no. B08040). J.F. Xu expresses thanks to C.Y.Hu,J.W.Xu,Z.Jian,M.Zhu,and Y.Y.Zhangfor their help in this work.
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Xu, J., Liu, F. & Zhang, D. Phase selection of undercooled solidification of Ni-4.5 wt% B alloy. Journal of Materials Research 28, 3347–3354 (2013). https://doi.org/10.1557/jmr.2013.358