Pressure-induced fcc to hcp phase transition in Ni-based high entropy solid solution alloys

F. X. Zhang, Shijun Zhao, Ke Jin, H. Bei, D. Popov, Changyong Park, J. C. Neuefeind, W. J. Weber, Yanwen Zhang

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Abstract

A pressure-induced phase transition from the fcc to a hexagonal close-packed (hcp) structure was found in NiCoCrFe solid solution alloy starting at 13.5 GPa. The phase transition is very sluggish and the transition did not complete at ∼40 GPa. The hcp structure is quenchable to ambient pressure. Only a very small amount (<5%) of hcp phase was found in the isostructural NiCoCr ternary alloy up to the pressure of 45 GPa and no obvious hcp phase was found in NiCoCrFePd system till to 74 GPa. Ab initio Gibbs free energy calculations indicated the energy differences between the fcc and the hcp phases for the three alloys are very small, but they are sensitive to temperature. The critical transition pressure in NiCoCrFe varies from ∼1 GPa at room temperature to ∼6 GPa at 500 K.

Original languageEnglish
Article number011902
JournalApplied Physics Letters
Volume110
Issue number1
DOIs
StatePublished - Jan 4 2017
Externally publishedYes

Funding

This work was supported as part of the Energy Dissipation to Defect Evolution (EDDE), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy of Sciences. Neutron diffraction measurements used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The XRD measurement was performed at HPCAT, which is supported by DOE-NNSA under Award No. DE-NA0001974 and DOE-BES under Award No. DEFG02-99ER45775. The Advanced Photon Source is a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by the Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

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