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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

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

Detail(s)

Original languageEnglish
Article number011902
Journal / PublicationApplied Physics Letters
Volume110
Issue number1
Publication statusPublished - 2 Jan 2017
Externally publishedYes

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.

Citation Format(s)

Pressure-induced fcc to hcp phase transition in Ni-based high entropy solid solution alloys. / Zhang, F. X.; Zhao, Shijun; Jin, Ke; Bei, H.; Popov, D.; Park, Changyong; Neuefeind, J. C.; Weber, W. J.; Zhang, Yanwen.

In: Applied Physics Letters, Vol. 110, No. 1, 011902, 02.01.2017.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review