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

Cameron L. Tracy (), Sulgiye Park, Dylan R. Rittman, Steven J. Zinkle, Hongbin Bei, Maik Lang, Rodney C. Ewing and Wendy L. Mao
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Cameron L. Tracy: Stanford University
Sulgiye Park: Stanford University
Dylan R. Rittman: Stanford University
Steven J. Zinkle: University of Tennessee
Hongbin Bei: Oak Ridge National Laboratory
Maik Lang: University of Tennessee
Rodney C. Ewing: Stanford University
Wendy L. Mao: Stanford University

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: 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.

Date: 2017
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DOI: 10.1038/ncomms15634

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