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

High pressure x-ray diffraction measurements reveal that the face-centered cubic (fcc) high-entropy alloy CrMnFeCoNi transforms martensitically to a hexagonal close-packed (hcp) phase at ~14 GPa. We attribute this to suppression of the local magnetic moments, destabilizing the fcc phase. Similar to fcc-to-hcp transformations in Al and the noble gases, this transformation is sluggish, occurring over a range of >40 GPa. But, the behavior of CrMnFeCoNi is unique in that the hcp phase is retained following decompression to ambient pressure, yielding metastable fcc-hcp mixtures.
Authors:
 [1] ;  [1] ; ORCiD logo [1] ;  [2] ; ORCiD logo [3] ;  [4] ;  [1] ;  [5]
  1. Stanford Univ., CA (United States). Dept. of Geological Sciences
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering and Dept. of Nuclear Engineering
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  4. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Nuclear Engineering
  5. 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
Publication Date:
Grant/Contract Number:
AC05-00OR22725; SC0001089; SC0006661; NA0001974; FG02-99ER45775; AC02-06CH11357; NA0002006; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; design, synthesis and processing; metals and alloys
OSTI Identifier:
1360058
Alternate Identifier(s):
OSTI ID: 1367849