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

Tracy, Cameron L.; Park, Sulgiye; Rittman, Dylan R.; Zinkle, Steven J.; Bei, Hongbin; Lang, Maik; Ewing, Rodney C.; Mao, Wendy L.

doi:10.1038/ncomms15634

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

Journal Article · Thu May 25 00:00:00 EDT 2017 · Nature Communications

DOI:https://doi.org/10.1038/ncomms15634· OSTI ID:1360058

Tracy, Cameron L. ^[1]; Park, Sulgiye ^[1];

^[1]; Zinkle, Steven J. ^[2];

^[3]; Lang, Maik ^[4]; Ewing, Rodney C. ^[1]; Mao, Wendy L. ^[5]

Stanford Univ., CA (United States). Dept. of Geological Sciences
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering and Dept. of Nuclear Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Nuclear Engineering
Stanford Univ., CA (United States). Dept. of Geological Sciences; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Materials Science of Actinides (MSA); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC05-00OR22725; SC0001089; SC0006661; NA0001974; FG02-99ER45775; AC02-06CH11357; NA0002006; AC02-76SF00515

OSTI ID:: 1360058

Alternate ID(s):: OSTI ID: 1367849

Journal Information:: Nature Communications, Vol. 8; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 208 works

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

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