skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: High pressure synthesis of a hexagonal close-packed phase of the high-entropy alloy CrMnFeCoNi

Abstract

High-entropy alloys, near-equiatomic solid solutions of five or more elements, represent a new strategy for the design of materials with properties superior to those of conventional alloys. However, their phase space remains constrained, with transition metal high-entropy alloys exhibiting only face- or body-centered cubic structures. Here, we report the high-pressure synthesis of a hexagonal close-packed phase of the prototypical high-entropy alloy CrMnFeCoNi. This martensitic transformation begins at 14 GPa and is attributed to suppression of the local magnetic moments, destabilizing the initial fcc structure. Similar to fcc-to-hcp transformations in Al and the noble gases, the transformation is sluggish, occurring over a range of >40 GPa. However, the behaviour of CrMnFeCoNi is unique in that the hcp phase is retained following decompression to ambient pressure, yielding metastable fcc-hcp mixtures. This demonstrates a means of tuning the structures and properties of high-entropy alloys in a manner not achievable by conventional processing techniques.

Authors:
; ; ORCiD logo; ; ORCiD logo; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1375340
Resource Type:
Journal Article
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 05, 2017; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE

Citation Formats

Tracy, Cameron L., Park, Sulgiye, Rittman, Dylan R., Zinkle, Steven J., Bei, Hongbin, Lang, Maik, Ewing, Rodney C., and Mao, Wendy L. High pressure synthesis of a hexagonal close-packed phase of the high-entropy alloy CrMnFeCoNi. United States: N. p., 2017. Web. doi:10.1038/ncomms15634.
Tracy, Cameron L., Park, Sulgiye, Rittman, Dylan R., Zinkle, Steven J., Bei, Hongbin, Lang, Maik, Ewing, Rodney C., & Mao, Wendy L. High pressure synthesis of a hexagonal close-packed phase of the high-entropy alloy CrMnFeCoNi. United States. doi:10.1038/ncomms15634.
Tracy, Cameron L., Park, Sulgiye, Rittman, Dylan R., Zinkle, Steven J., Bei, Hongbin, Lang, Maik, Ewing, Rodney C., and Mao, Wendy L. Thu . "High pressure synthesis of a hexagonal close-packed phase of the high-entropy alloy CrMnFeCoNi". United States. doi:10.1038/ncomms15634.
@article{osti_1375340,
title = {High pressure synthesis of a hexagonal close-packed phase of the high-entropy alloy CrMnFeCoNi},
author = {Tracy, Cameron L. and Park, Sulgiye and Rittman, Dylan R. and Zinkle, Steven J. and Bei, Hongbin and Lang, Maik and Ewing, Rodney C. and Mao, Wendy L.},
abstractNote = {High-entropy alloys, near-equiatomic solid solutions of five or more elements, represent a new strategy for the design of materials with properties superior to those of conventional alloys. However, their phase space remains constrained, with transition metal high-entropy alloys exhibiting only face- or body-centered cubic structures. Here, we report the high-pressure synthesis of a hexagonal close-packed phase of the prototypical high-entropy alloy CrMnFeCoNi. This martensitic transformation begins at 14 GPa and is attributed to suppression of the local magnetic moments, destabilizing the initial fcc structure. Similar to fcc-to-hcp transformations in Al and the noble gases, the transformation is sluggish, occurring over a range of >40 GPa. However, the behaviour of CrMnFeCoNi is unique in that the hcp phase is retained following decompression to ambient pressure, yielding metastable fcc-hcp mixtures. This demonstrates a means of tuning the structures and properties of high-entropy alloys in a manner not achievable by conventional processing techniques.},
doi = {10.1038/ncomms15634},
journal = {Nature Communications},
issn = {2041-1723},
number = 05, 2017,
volume = 8,
place = {United States},
year = {2017},
month = {5}
}

Works referenced in this record:

Nanostructured High-Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes
journal, May 2004

  • Yeh, J.-W.; Chen, S.-K.; Lin, S.-J.
  • Advanced Engineering Materials, Vol. 6, Issue 5, p. 299-303
  • DOI: 10.1002/adem.200300567