Irreversible phase transformation in a CoCrFeMnNi high entropy alloy under hydrostatic compression

E-Wen Huang*, Chih Ming Lin, Jayant Jain, Sean R. Shieh, Ching Pao Wang, Yu Chun Chuang, Yen Fa Liao, Dong Zhou Zhang, Tony Huang, Tu Ngoc Lam, Wanchuck Woo, Soo Yeol Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


An equal-molar CoCrFeMnNi, face-centered-cubic high-entropy alloy system is investigated using in-situ angular-dispersive X-ray diffraction under hydrostatic compression up to 20 GPa via diamond anvil cell. The evolutions of multiple diffraction peaks are collected simultaneously to elucidate the phase stability field. The results indicated that an irreversible phase transformation had occurred in the high entropy alloy upon decompression to ambient pressure. A reference material (n-type silicon-doped gallium arsenide) was investigated following the same protocol to demonstrate the different deformation mechanisms. It is suggested that the atomic bonding characteristics on the phase stability may play an important role in the high entropy alloys.

Original languageEnglish
Pages (from-to)10-14
Number of pages5
JournalMaterials Today Communications
StatePublished - Mar 2018


  • Synchrotron x-ray diffraction
  • Metal and alloys
  • Phase transformation
  • Microstructure
  • High entropy alloy

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