Abstract
Solidification microstructures are significantly affected by the anisotropy of crystal/crystal interphase energy. A recent experimental work on a three-phase eutectic system by the authors suggested that two distinguishable eutectic grains, i.e., quasi-isotropic and locked, form when crystal/crystal interphase energies contain negligible and strong anisotropy, respectively (Mohagheghi and Şerefoğlu in Acta Mater 2018, vol. 151, pp. 432–42, 2018). In two-phase eutectic systems, in addition to these two grain types, another class of eutectic grain called nearly-locked (NL) was reported. In order to investigate the existence of the NL grain in three-phase eutectic systems, real-time directional solidification (DS) and rotating directional solidification (RDS) experiments are performed on thin samples of In-Bi-Sn eutectic alloy. It is found that NL grains also form in three-phase eutectics and they contain some characteristic features of both quasi-isotropic and locked grains. The anisotropy is strong enough to tilt the lamellar pattern with respect to the thermal gradient axis, as in the case of locked grains; however, the NL grains also retain some of the characteristic features of the quasi-isotropic grains, such as λ-diffusion, systematic eutectic spacing adjustment, and recovery mechanisms. As a result, these grains tend to form a relatively uniform ABAC-type growth pattern, similar to quasi-isotropic grains. Using the equilibrium shapes extracted from the interphase traces of RDS patterns, the γ plot of the anisotropic interphase, which contains 2 twofold smooth and distinct minima, is determined.
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S. Mohagheghi: Ph.D. Thesis, Koc University, Istanbul, 2018.
Acknowledgments
We gratefully acknowledge the assistance of J.A. Dantzig, in the determination of the interphase energy anisotropy parameters and Wulff shape from the experimental data, and S.E. Layegh, with some of the associated coding. This work was supported by European Commission Marie Curie Career Integration Grant No. FP7-PEOPLE-2012-CIG (NEUSOL 334216) and TÜBİTAK 3501 (Grant No. 212M013).
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Manuscript submitted April 2, 2019.
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Mohagheghi, S., Şerefoğlu, M. On the Growth Dynamics of Nearly-Locked Grain in the Three-Phase In-Bi-Sn Eutectic System. Metall Mater Trans A 50, 5221–5233 (2019). https://doi.org/10.1007/s11661-019-05426-3
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DOI: https://doi.org/10.1007/s11661-019-05426-3