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Manufacturing of High Entropy Alloys

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Abstract

High entropy alloys (HEAs) have generated interest in recent years due to their unique positioning within the alloy world. By incorporating a number of elements in high proportion they have high configurational entropy, and thus they hold the promise of interesting and useful properties such as enhanced strength and phase stability. The present study investigates the microstructure of two single-phase face-centered cubic (FCC) HEAs, CoCrFeNi and CoCrFeNiMn, with special attention given to melting, homogenization and thermo-mechanical processing. Large-scale ingots were made by vacuum induction melting to avoid the extrinsic factors inherent in small-scale laboratory button samples. A computationally based homogenization heat treatment was applied to both alloys in order to eliminate segregation due to normal ingot solidification. The alloys fabricated well, with typical thermo-mechanical processing parameters being employed.

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Acknowledgments

This research was performed in 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. The authors would like to thank Paul Danielson for preparing the SEM samples and optical micrographs; Richard Chin for performing WDXRF analysis; John Sears for preparing and examining TEM specimens; and Christopher Powell for performing tensile tests.

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. National Energy Technology Laboratory, Albany, OR, USA

    Paul D. Jablonski, Joseph J. Licavoli, Michael C. Gao & Jeffrey A. Hawk

  2. AECOM, P.O. Box 1959, Albany, OR, USA

    Michael C. Gao

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  1. Paul D. Jablonski
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  2. Joseph J. Licavoli
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  3. Michael C. Gao
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  4. Jeffrey A. Hawk
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Correspondence to Paul D. Jablonski.

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Jablonski, P.D., Licavoli, J.J., Gao, M.C. et al. Manufacturing of High Entropy Alloys. JOM 67, 2278–2287 (2015). https://doi.org/10.1007/s11837-015-1540-3

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  • DOI: https://doi.org/10.1007/s11837-015-1540-3

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