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Cryogenic temperatures promote the pressure-induced polymorphic transition in CoCrFeMnNi high entropy alloy

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/5.0220107· OSTI ID:2586976
 [1];  [2];  [3];  [1];  [4];  [5];  [1]
  1. Chalmers University of Technology, Gothenburg (Sweden)
  2. MAX IV Laboratory, Lund (Sweden)
  3. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  4. Agency for Science, Technology and Research (A*STAR), Singapore (Singapore). Singapore Institute of Manufacturing Technology (SIMTech)
  5. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Pressure-induced polymorphism has recently been demonstrated in several high entropy alloys. This offers a new window into the much-debated issue of phase selection and stability in these systems. Here, we examine the effect of cryogenic temperatures on the pressure-induced transition from face centered cubic to hexagonal close-packed structures of the prototype CoCrFeMnNi (Cantor) alloy. We observe a reduction in the critical pressure for the onset of the polymorphic transition as the temperature decreases, confirming the progressive stabilization of the hexagonal phase with decreasing temperature previously predicted by ab initio calculations accounting for magnetic interactions. We argue that in situ high-pressure experiments at cryogenic temperatures, which suppress time-dependent transformation triggered at higher temperatures, present a unique opportunity to significantly improve our understanding of these complex alloys.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2586976
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 11 Vol. 136; ISSN 0021-8979; ISSN 1089-7550
Publisher:
AIP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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