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High-Entropy Alloys in Hexagonal Close-Packed Structure

  • Symposium: High Entropy Alloys III
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Abstract

The microstructures and properties of high-entropy alloys (HEAs) based on the face-centered cubic and body-centered cubic structures have been studied extensively in the literature, but reports on HEAs in the hexagonal close-packed (HCP) structure are very limited. Using an efficient strategy in combining phase diagram inspection, CALPHAD modeling, and ab initio molecular dynamics simulations, a variety of new compositions are suggested that may hold great potentials in forming single-phase HCP HEAs that comprise rare earth elements and transition metals, respectively. Experimental verification was carried out on CoFeReRu and CoReRuV using X-ray diffraction, scanning electron microscopy, and energy dispersion spectroscopy.

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Acknowledgments

This work was funded by the Cross-Cutting Technologies Program at the National Energy Technology Laboratory (NETL) – Strategic Center for Coal, managed by Robert Romanosky (Technology Manager) and Charles Miller (Technology Monitor). The Research was executed through NETL’s Office of Research and Development’s Innovative Process Technologies (IPT) Field Work Proposal. Research performed by AECOM Staff was conducted under the RES contract DE-FE-0004000. M.C.G. wishes to thank Mike Widom, Dan Sorescu, Bryan Morreale, and David Alman for useful discussions on the HEA topic, and Paul Mason, Andreas Markström, and Qing Chen from ThermoCalc for technical support.

Disclaimer

This project was funded by the Department of Energy, National Energy Technology Laboratory, an agency of the United States Government, through a support contract with AECOM. Neither the United States Government nor any agency thereof, nor any of their employees, nor AECOM, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

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Authors and Affiliations

  1. AECOM at National Energy Technology Laboratory, P.O. Box 1959, Albany, OR, 97321, USA

    M. C. Gao (Principal Materials Scientist)

  2. Department of Mechanical & Industrial Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA

    B. Zhang (Graduate Student) & S. M. Guo (Professor)

  3. Department of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

    J. W. Qiao (Professor)

  4. Structural Materials Development Division, National Energy Technology Laboratory, Albany, OR, 97321, USA

    J. A. Hawk (Group Leader)

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  1. M. C. Gao
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Correspondence to M. C. Gao.

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Manuscript submitted May 25, 2015.

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Gao, M.C., Zhang, B., Guo, S.M. et al. High-Entropy Alloys in Hexagonal Close-Packed Structure. Metall Mater Trans A 47, 3322–3332 (2016). https://doi.org/10.1007/s11661-015-3091-1

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