Cryogenic-deformation-induced phase transformation in an FeCoCrNi high-entropy alloy

Qingyun Lin, Junpeng Liu, Xianghai An, Hao Wang, Yong Zhang, Xiaozhou Liao

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174 Citations (Scopus)

Abstract

An FeCoCrNi high-entropy alloy (HEA) was deformed at ambient temperature and cryogenic temperatures down to 4.2 K. Phase transformation from a face-centered cubic (FCC) structure to a hexagonal close-packed (HCP) structure occurred during cryogenic deformation. Lowering the temperature promotes the transformation. Atomic-scale structural characterisation suggested that the formation of the HCP structure was achieved via the glide of Shockley partial dislocations on every other {111}FCC plane. Due to the kinetic limitation, the occurrence of this transformation was limited even though theoretical investigations predicted lower free energy of the HCP phase than that of the FCC phase in the HEA.

Original languageEnglish
Pages (from-to)236-243
Number of pages8
JournalMaterials Research Letters
Volume6
Issue number4
DOIs
Publication statusPublished - 2018
Externally publishedYes

Keywords

  • cryogenic temperature
  • High-entropy alloy
  • phase transformation
  • shockley partial dislocations

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