Abstract
The change of eutectic solidification mode in undercooled Ni-3.3 wt pct B melt was studied by fluxing and cyclic superheating. The eutectic structure is mainly controlled by the undercooling for eutectic solidification, ΔT 2, instead of ΔT 1, the undercooling for primary solidification. At a small ∆T 2 [e.g., 56 K (56 °C)], the stable eutectic reaction (L → Ni3B + Ni) occurs and the eutectic morphology consists of lamellar and anomalous eutectic; whereas at a larger ∆T 2 [≥140 K (140 °C)], the metastable eutectic reaction (L → Ni23B6 + Ni) occurs and the eutectic morphology consists of matrix, network boundary, and two kinds of dot phases. Further analysis declares that the regularly distributed dot phases with larger size come from the metastable eutectic transformation and are identified as α-Ni structure, whereas the irregularly distributed ones with smaller size are a product of the metastable decomposition and tend to have a similar structure to α-Ni as it grows. Calculation of the classical nucleation theory shows that the competitive nucleation between Ni23B6 and Ni3B leads to a critical undercooling, ΔT *2 [125 K < ΔT *2 < 157 K (125 °C < ∆T *2 < 157 °C)], for the metastable/stable eutectic formation.
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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) (Grant No. 2011CB610403), the Natural Science Foundation of China (Grant Nos. 50901059, 51071127, and 51134011), and the Fundamental Research Fund of Northwestern Polytechnical University (Grant No. JC20120223). Xu Junfeng expresses thanks to Master C.Y. Hu, J.W. Xu, K. Zhang, X.L. Xu, S.J. Song, Y.H. Jiang, M.M. Gong, K. Wang, and D. Zhang for their help in this work.
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Manuscript submitted May 19, 2012.
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Xu, J., Liu, F. & Dang, B. Phase Selection in Undercooled Ni-3.3 Wt Pct B Alloy Melt. Metall Mater Trans A 44, 1401–1408 (2013). https://doi.org/10.1007/s11661-012-1496-7
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DOI: https://doi.org/10.1007/s11661-012-1496-7