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A Successful Synthesis of the CoCrFeNiAl0.3 Single-Crystal, High-Entropy Alloy by Bridgman Solidification

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Abstract

For the first time, a face-centered-cubic, single-crystal CoCrFeNiAl0.3 (designated as Al0.3), high-entropy alloy (HEA) was successfully synthesized by the Bridgman solidification (BS) method, at an extremely low withdrawal velocity through a constant temperature gradient, for which it underwent two BS steps. Specially, at the first BS step, the alloy sample underwent several morphological transitions accompanying the crystal growth from the melt. This microstructure evolves from as-cast dendrites, to equiaxed grains, and then to columnar crystals, and last to the single crystal. In particular, at the equiaxed-grain region, some visible annealing twins were observed, which indicates a low stacking fault energy of the Al0.3 alloy. Although a body-centered-cubic CoCrFeNiAl (Al1) HEA was also prepared under the same conditions, only a single columnar-crystal structure with instinctively preferential crystallographic orientations was obtained by the same procedure. A similar morphological transition from dendrites to equiaxed grains occurred at the equiaxed-grain region in Al1 alloy, but the annealing twins were not observed probably because a higher Al addition leads to a higher stacking fault energy for this alloy.

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Acknowledgements

The authors are grateful for the Program for National Natural Science Foundation of China (NNSFC) (Contract No: 50971019). MCG acknowledges support of the Innovative Processing and Technologies Program of the National Energy Technology Laboratory’s (NETL) Strategic Center for Coal under the RES Contract DE-FE-0004000. PKL very much appreciates the financial support from the U.S. National Science Foundation (DMR-0909037, CMMI-0900271, and CMMI-1100080), the Department of Energy (DOE), Office of Nuclear Energy’s Nuclear Energy University Programs (NEUP) 00119262, and the DOE, Office of Fossil Energy, National Energy Technology Laboratory (DE-FE-0008855) with C. Huber, C. V. Cooper, D. Finotello, A. Ardell, E. Taleff, V. Cedro, R. O. Jensen, L. Tan, and S. Lesica as contract monitors.

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Authors and Affiliations

  1. High-Entropy Alloys Research Center, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    S. G. Ma, S. F. Zhang & Y. Zhang

  2. National Energy Technology Laboratory, Albany, OR, 97321, USA

    M. C. Gao

  3. URS Corporation, Albany, OR, 97321, USA

    M. C. Gao

  4. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN, 37996, USA

    P. K. Liaw

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  1. S. G. Ma
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  2. S. F. Zhang
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  3. M. C. Gao
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  4. P. K. Liaw
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  5. Y. Zhang
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Correspondence to Y. Zhang.

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Ma, S.G., Zhang, S.F., Gao, M.C. et al. A Successful Synthesis of the CoCrFeNiAl0.3 Single-Crystal, High-Entropy Alloy by Bridgman Solidification. JOM 65, 1751–1758 (2013). https://doi.org/10.1007/s11837-013-0733-x

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  • DOI: https://doi.org/10.1007/s11837-013-0733-x

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