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Phase Selection and Microstructure Evolution in Nonequilibrium Solidification of Fe40Ni40B20 Alloy

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Phase selection and microstructure evolution in nonequilibrium solidification of ternary eutectic Fe40Ni40B20 alloy have been studied. It is shown that γ-(Fe, Ni) and (Fe, Ni)3B prevail in all the as-solidified samples. No metastable phase has been found in the deeply undercooled samples. This is explained as resulting from the size effect of undercooled solidification. At small and medium undercoolings, the dendrite γ-(Fe, Ni) appears as the leading phase. This is ascribed to the existence of the skewed coupled growth zone in FeNiB alloy. With increasing undercooling, the amount of dendrites first increases and then decreases, accompanied by a transition from regular eutectic to anomalous eutectic. The formation mechanisms of the anomalous eutectics are discussed. Two kinds of microstructure refinement are found with increasing undercooling in a natural or water cooling condition. However, for melts with the same undercooling, the as-solidified microstructure refines first, and then coarsens with an increasing cooling rate. The experimental results show that the nanostructure eutectic cell has been obtained in the case of Ga-In alloy bath cooling with an initial melt undercooling of approximately 50 K (50 °C).

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Acknowledgments

The authors are grateful for the financial support from the Free Research Fund of State Key Lab of Solidification Processing (09-QZ-2008 and 24-TZ-2009), the 111 project (B08040), the Natural Science Foundation of China (Grant No. 51071127, 50901059), the Huo Yingdong Young Teacher Fund (111502), the Fundamental Research Fund of Northwestern Polytechnical University (JC200801), and the National Basic Research Program of China (973 Program) 2011CB610403.

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Authors and Affiliations

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

    Ke Zhang (Ph.D. Candidate of Materials Processing Engineering), Feng Liu (Professor), Jun-Feng Xu (Ph.D. Candidate of Materials Processing Engineering) & Gen-Cang Yang (Professor)

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  1. Ke Zhang
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  2. Feng Liu
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  3. Jun-Feng Xu
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  4. Gen-Cang Yang
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Correspondence to Feng Liu.

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Manuscript submitted May 12, 2011.

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Zhang, K., Liu, F., Xu, JF. et al. Phase Selection and Microstructure Evolution in Nonequilibrium Solidification of Fe40Ni40B20 Alloy. Metall Mater Trans A 43, 1578–1587 (2012). https://doi.org/10.1007/s11661-011-0976-5

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