Abstract
The cooling curves for Fe-21 at. pct B hypereutectic alloy were measured, which are correlated with the solidification behaviors. At small undercoolings, the cooling curve has two recalescences, corresponding to L → Fe2B and L → Fe2B + Fe, respectively. At moderate undercoolings, also two recalescences can be observed from the cooling curve, corresponding to L → Fe3B and L + Fe3B → Fe2B + Fe. At large undercoolings, the cooling curve has only one recalescence, corresponding to L → Fe3B + Fe. From TEM analysis, the matrix phase is α-Fe in cases of solidification at small and moderate undercoolings, but is Fe3B in case of large undercooling. HRTEM analysis shows that α-Fe stores deformation energy by irregular atom region, but intermetallic phase (Fe2B or Fe3B) stores deformation energy by increasing grain boundaries and stacking faults, which can explain why α-Fe has good deformation ability and small hardness, but the Fe2B or Fe3B phase on the contrary.
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Acknowledgments
The authors are grateful for the financial support of the Natural Science Foundation of China (Grant Nos. 51401156, 51371133, and 51671151) and the Science and Technology Program of Shaanxi Province (Grant No. 2016KJXX-87). One of the authors (JX) also appreciates C.Y. Hu and K. Wang for their help in this work.
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Manuscript submitted June 30, 2016.
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Xu, J., Jian, Z., Dang, B. et al. Solidification Behavior and Cooling Curves for Hypereutectic Fe-21 At. Pct B Alloy. Metall Mater Trans A 48, 1817–1826 (2017). https://doi.org/10.1007/s11661-016-3941-5
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DOI: https://doi.org/10.1007/s11661-016-3941-5